PHARMACOKINETICS SECTION.

12.3Pharmacokinetics. The pharmacokinetic (PK) properties of BIKTARVY components are provided in Table 4. The multiple dose PK parameters of BIKTARVY components (based on population pharmacokinetic analysis) are provided in Table 5.Table 4Pharmacokinetic Properties of the Components of BIKTARVYBictegravir (BIC)Emtricitabine (FTC)Tenofovir Alafenamide (TAF)PBMCs=peripheral blood mononuclear cells; CES1=carboxylesterase 1AbsorptionTmax (h)Values reflect administration of BIKTARVY with or without food. 2.0-4.01.5-2.00.5-2.0Effect of high-fat meal (relative to fasting)Values refer to geometric mean ratio [high-fat meal/ fasting] in PK parameters and (90% confidence interval). High fat meal is approximately 800 kcal, 50% fat. AUC ratio1.24 (1.16, 1.33)0.96 (0.93, 0.99)1.63 (1.43, 1.85)Cmax ratio1.13 (1.06, 1.20)0.86 (0.78, 0.93)0.92 (0.73, 1.14)Distribution% bound to human plasma proteins>99<4~80Blood-to-plasma ratio0.640.61.0Eliminationt1/2 (h)t1/2 values refer to median (Q1, Q3) terminal plasma half-life. Note that the active metabolite of TAF, tenofovir diphosphate, has half-life of 150-180 hours within PBMCs. 17.3 (14.8, 20.7)10.4 (9.0, 12.0)0.51 (0.45, 0.62) Metabolism Metabolic pathway(s)CYP3AUGT1A1Not significantly metabolizedCathepsin AIn vivo, TAF is hydrolyzed within cells to form tenofovir (major metabolite), which is phosphorylated to the active metabolite, tenofovir diphosphate. In vitro studies have shown that TAF is metabolized to tenofovir by cathepsin in PBMCs and macrophages; and by CES1 in hepatocytes. (PBMCs)CES1 (hepatocytes)ExcretionMajor route of eliminationMetabolismGlomerular filtration and active tubular secretionMetabolism% of dose excreted in urineDosing in mass balance studies: single dose administration of [14C] BIC; single dose administration of [14C] FTC after multiple dosing of FTC for ten days; single dose administration of [14C] TAF. 3570<1% of dose excreted in feces 60.313.731.7Table 5Multiple Dose PK Parameters of BIC, FTC, and TAF Following Oral Administration of BIKTARVY in HIV-Infected AdultsParameter Mean (CV%)BictegravirEmtricitabineTenofovir AlafenamideCV=Coefficient of Variation; NA=Not ApplicableCmax (microgram per mL)6.15 (22.9)2.13 (34.7)0.121 (15.4)AUCtau (microgramh per mL)102 (26.9)12.3 (29.2)0.142 (17.3)Ctrough (microgram per mL)2.61 (35.2)0.096 (37.4)NA. Specific Populations. Patients with Renal ImpairmentNo clinically relevant differences in the pharmacokinetics of BIC, TAF, or its metabolite tenofovir were observed between subjects with severe renal impairment (estimated creatinine clearance of 15 to less than 30 mL/min, by Cockcroft-Gault method) and healthy subjects in Phase studies. In separate Phase study of FTC alone, FTC exposures were increased in subjects with severe renal impairment.The pharmacokinetics of BIC, FTC and TAF were evaluated in subset of HIV-1 infected virologically-suppressed subjects with ESRD (estimated creatinine clearance less than 15 mL/min, by Cockcroft-Gault method) receiving chronic hemodialysis in Trial 1825. The pharmacokinetics of TAF were similar between healthy subjects and subjects with ESRD receiving chronic hemodialysis; increases in FTC and tenofovir exposures in subjects with ESRD were not considered clinically relevant. Median (minimum, maximum) BIC Ctrough values in subjects (n=7) with ESRD who received BIKTARVY were 846 ng/mL (288, 1810) compared to 2540 ng/mL (757, 6499) in subjects (N=584) with normal renal function. Despite significantly lower BIC Ctrough values in the virologically-suppressed ESRD population, virologic suppression was maintained [see Use in Specific Populations (8.6), Clinical Studies (14.3)].. Patients with Hepatic Impairment. Bictegravir: Clinically relevant changes in the pharmacokinetics of BIC were not observed in subjects with moderate (Child-Pugh Class B) hepatic impairment.. Emtricitabine: The pharmacokinetics of FTC has not been studied in subjects with hepatic impairment; however, FTC is not significantly metabolized by liver enzymes, so the impact of hepatic impairment should be limited.. Tenofovir Alafenamide: Clinically relevant changes in the pharmacokinetics of TAF or its metabolite tenofovir were not observed in subjects with mild or moderate (Child-Pugh Class and B) hepatic impairment [see Use in Specific Populations (8.7)].. Hepatitis and/or Hepatitis Virus CoinfectionThe pharmacokinetics of BIC, FTC, and TAF have not been evaluated in subjects coinfected with hepatitis and/or virus.. Geriatric PatientsThe pharmacokinetics of BIC, FTC, and TAF have not been fully evaluated in the elderly (65 years of age and older). Population pharmacokinetics analysis of HIV-infected subjects in Phase trials of BIKTARVY showed that age did not have clinically relevant effect on exposures of BIC and TAF up to 74 years of age [see Use in Specific Populations (8.5)].. Pediatric PatientsMean BIC Ctrough was lower in 50 pediatric patients aged 12 to less than 18 years and weighing at least 35 kg who received BIKTARVY in Trial 1474 relative to adults following administration of BIKTARVY, but was not considered clinically significant based on exposure-response relationships; exposures of FTC and TAF in these pediatric patients were similar to those in adults (Table 6).Table 6Multiple Dose PK Parameters of BIC, FTC, and TAF Following Oral Administration of BIKTARVY in HIV-Infected Pediatric Subjects Aged 12 to less than 18 yearsParameter Mean (CV%)BictegravirFrom Population PK analysis of cohort of Trial 1474 (n=50 for BIC; n=49 for TAF). EmtricitabineFrom Intensive PK analysis of cohort of Trial 1474 (n=24). Tenofovir Alafenamide CV=Coefficient of Variation; NA=Not ApplicableCmax (microgram per mL) 6.24 (27.1)2.69 (34.0)0.133 (70.2)AUCtau (microgramh per mL)89.1 (31.0)13.6 (21.7)0.196 (50.3)Ctrough (microgram per mL)1.78 (44.4)0.064 (25.0)NAMean BIC Cmax, and exposures of FTC and TAF (AUCtau and Cmax) achieved in 50 pediatric patients between the ages of to less than 12 years and weighing at least 25 kg, and in 22 pediatric patients at least years of age and weighing at least 14 to less than 25 kg who received BIKTARVY in Trial 1474 were higher than exposures in adults; however, the increases were not considered clinically significant as the safety profiles were similar in adult and pediatric patients (Tables and 8) [see Use in Specific Populations (8.4)].Table 7Multiple Dose PK Parameters of BIC, FTC, and TAF Following Oral Administration of BIKTARVY in HIV-Infected Pediatric Subjects Aged to less than 12 yearsParameter Mean (CV%)BictegravirFrom Population PK analysis of cohort of Trial 1474 (n=50 for BIC; n=47 for TAF). EmtricitabineFrom Intensive PK analysis of cohort of Trial 1474 (n=25 except n=24 for Ctrough). Tenofovir Alafenamide CV=Coefficient of Variation; NA=Not ApplicableCmax (microgram per mL) 9.46 (24.3)3.89 (31.0)0.205 (44.6)AUCtau (microgramh per mL)128 (27.8)17.6 (36.9)0.278 (40.3)Ctrough (microgram per mL)2.36 (39.0)0.227 (323)NATable 8Multiple Dose PK Parameters of BIC, FTC, and TAF Following Oral Administration of BIKTARVY in HIV-Infected Pediatric Subjects at Least Years of AgeCohort of Trial 1474 enrolled pediatric subjects from to years of age. and Weighing at Least 14 to Less than 25 kgParameter Mean (CV%)BictegravirFrom Population PK analysis of cohort of Trial 1474 (n=22). EmtricitabineFrom Intensive PK analysis of cohort of Trial 1474 (n=12 except n=11 for Ctrough for FTC). Tenofovir Alafenamide CV=Coefficient of Variation; NA=Not ApplicableCmax (microgram per mL) 9.15 (44.8)3.85 (34.7)0.414 (31.0)AUCtau (microgramh per mL)126 (42.4)15.0 (21.9)0.305 (42.6)Ctrough (microgram per mL)2.43 (40.1)0.210 (243)NA. Race and GenderNo clinically relevant changes in the pharmacokinetics of BIC, FTC, and TAF were observed based on gender or race.. Drug Interaction StudiesAs BIKTARVY is complete regimen for the treatment of HIV-1 infection, comprehensive information regarding potential drug-drug interactions with other antiretroviral agents is not provided.BIC is substrate of CYP3A and UGT1A1.BIC is an inhibitor of OCT2 and MATE1. At clinically relevant concentrations, BIC is not an inhibitor of hepatic transporters OATP1B1, OATP1B3, OCT1, BSEP, renal transporters OAT1 and OAT3, or CYP (including CYP3A) or UGT1A1 enzymes.TAF is substrate of P-gp and BCRP.At clinically relevant concentrations, TAF is not an inhibitor of drug transporters P-gp, BCRP, hepatic transporters OATP1B1, OATP1B3, OCT1, BSEP, renal transporters OAT1, OAT3, OCT2, MATE1, or CYP (including CYP3A) or UGT1A1 enzymes.Drug interaction studies were conducted with BIKTARVY or its components. Tables and 10 summarize the pharmacokinetic effects of other drugs on BIC and TAF, respectively. Table 11 summarizes the pharmacokinetic effects of BIKTARVY or its components on other drugs.. Effect of Other Drugs on BIKTARVY ComponentsTable 9Effect of Other Drugs on BICAll interaction studies conducted in healthy volunteers. Coadministered DrugDose of Coadministered Drug (mg)BIC (mg)Mean Ratio of BIC Pharmacokinetic Parameters (90% CI); No effect 1.00Cmax AUCCmin NA= Not ApplicableLedipasvir/Sofosbuvir (fed)90/400 once daily75 once daily0.98(0.94, 1.03)1.00(0.97, 1.03)1.04(0.99, 1.09)Rifabutin (fasted)300 once daily75 once daily0.80(0.67, 0.97)0.62(0.53, 0.72)0.44(0.37, 0.52)Rifampin (fed)600 once daily75 single dose0.72(0.67, 0.78)0.25(0.22, 0.27)NASofosbuvir/ velpatasvir/ voxilaprevir (fed)400/100/100+100 voxilaprevirStudy conducted with additional voxilaprevir 100 mg to achieve voxilaprevir exposures expected in HCV-infected patients. once daily50 once daily0.98(0.94, 1.01)1.07(1.03, 1.10)1.10(1.05, 1.17)Voriconazole (fasted)300 twice daily75 single dose1.09(0.96, 1.23)1.61(1.41, 1.84)NAMaximum strength antacid (simultaneous administration, fasted)20 mLMaximum strength antacid contained 80 mg aluminum hydroxide, 80 mg magnesium hydroxide, and mg simethicone, per mL. single dose (oral)50 single dose0.20(0.16, 0.24)0.21(0.18, 0.26)NAMaximum strength antacid (2 after BIKTARVY fasted)20 mL single dose (oral)50 single dose0.93(0.88, 1.00)0.87(0.81, 0.93)NAMaximum strength antacid (2 before BIKTARVY fasted)20 mL single dose (oral)50 single dose0.42(0.33, 0.52)0.48(0.38, 0.59)NAMaximum strength antacid (simultaneous administration, fedReference treatment administered under fasted conditions.)20 mL single dose (oral)50 single dose0.51(0.43, 0.62)0.53(0.44, 0.64)NACalcium carbonate (simultaneous administration, fasted)1200 single dose50 single dose0.58(0.51, 0.67)0.67(0.57, 0.78)NACalcium carbonate (simultaneous administration, fed)1200 single dose50 single dose0.90(0.78, 1.03)1.03(0.89, 1.20)NAFerrous fumarate (simultaneous administration, fasted)324 single dose50 single dose0.29(0.26, 0.33)0.37(0.33, 0.42)NAFerrous fumarate (simultaneous administration, fed)324 single dose50 single dose0.75(0.65, 0.87)0.84(0.74, 0.95)NATable 10 Effect of Other Drugs on TAFAll interaction studies conducted in healthy volunteers. Coadministered DrugDose of Coadministered Drug (mg)Tenofovir Alafenamide (mg)Mean Ratio of Tenofovir Alafenamide Pharmacokinetic Parameters (90% CI); No effect 1.00Cmax AUCCmin NA= Not ApplicableCarbamazepine300 twice daily25 single doseStudy conducted with emtricitabine/tenofovir alafenamide. 0.43(0.36, 0.51)0.46(0.40, 0.54)NALedipasvir/sofosbuvir90/400 once daily25 once daily1.17(1.00, 1.38)1.27(1.19, 1.34)NASofosbuvir/ velpatasvir/ voxilaprevir400/100/100 +100 voxilaprevirStudy conducted with additional voxilaprevir 100 mg to achieve voxilaprevir exposures expected in HCV-infected patients. once daily25 once daily1.28(1.09, 1.51)1.57(1.44, 1.71)NA. Effect of BIKTARVY Components on Other DrugsTable 11 Effect of Components of BIKTARVY on Other DrugsAll interaction studies conducted in healthy volunteers. Coadministered DrugDose of Coadministered Drug (mg)BIC (mg)TAF (mg)Mean Ratio of Coadministered Drug Pharmacokinetic Parameters (90% CI); No effect 1.00Cmax AUCCmin NA= Not ApplicableLedipasvir90/400 once daily75 once daily25 once daily0.85(0.81, 0.90)0.87(0.83, 0.92)0.90(0.84, 0.96)Sofosbuvir1.11(1.00, 1.24)1.07(1.01, 1.13)NAGS-331007The predominant circulating nucleoside metabolite of sofosbuvir. 1.10(1.07, 1.13)1.11(1.08, 1.14)1.02(0.99, 1.06)Metformin500 twice daily50 once daily25 once daily1.28(1.21, 1.36)1.39(1.31, 1.48)1.36(1.21, 1.53)Midazolam2 single dose50 once daily25 once daily1.03(0.87, 1.23)1.15(1.00, 1.31)NANorelgestrominnorgestimate 0.180/0.215/0.250 once daily /ethinyl estradiol 0.025 once daily75 once daily-1.23(1.14, 1.32)1.08(1.05, 1.10)1.10(1.05, 1.15)Norgestrel1.15(1.10, 1.21)1.13(1.07, 1.19)1.14(1.06, 1.22)Ethinyl estradiol1.15(1.03, 1.27)1.04(0.99, 1.10)1.05(0.95, 1.14)Norelgestrominnorgestimate 0.180/0.215/0.250 once daily ethinyl estradiol 0.025 once daily-25 once dailyStudy conducted with emtricitabine/tenofovir alafenamide. 1.17(1.07,1.26)1.12(1.07,1.17)1.16(1.08, 1.24)Norgestrel1.10(1.02, 1.18)1.09(1.01, 1.18)1.11(1.03, 1.20)Ethinyl estradiol1.22(1.15, 1.29)1.11(1.07, 1.16)1.02(0.92, 1.12)Sertraline50 single dose-10 once dailyStudy conducted with elvitegravir/cobicistat/emtricitabine/tenofovir alafenamide. 1.14(0.94, 1.38)0.93(0.77, 1.13)NASofosbuvir400/100/100+100Study conducted with additional voxilaprevir 100 mg to achieve voxilaprevir exposures expected in HCV-infected patients. once daily50 once daily25 once daily1.14(1.04,1.25)1.09(1.02, 1.15)NAGS-331007 1.03(0.99,1.06)1.03(1.00,1.06)1.01(0.98, 1.05)Velpatasvir0.96(0.91,1.01)0.96(0.90, 1.02)0.94(0.88, 1.01)Voxilaprevir0.90(0.76, 1.06)0.91(0.80, 1.03)0.97(0.88, 1.06).

ADVERSE REACTIONS SECTION.

6ADVERSE REACTIONS. The following adverse reactions are discussed in other sections of the labeling:Severe Acute Exacerbations of Hepatitis [see Warnings and Precautions (5.1)].Immune Reconstitution Syndrome [see Warnings and Precautions (5.3)].New Onset or Worsening Renal Impairment [see Warnings and Precautions (5.4)]. Lactic Acidosis/Severe Hepatomegaly with Steatosis [see Warnings and Precautions (5.5)]. Severe Acute Exacerbations of Hepatitis [see Warnings and Precautions (5.1)].. Immune Reconstitution Syndrome [see Warnings and Precautions (5.3)].. New Onset or Worsening Renal Impairment [see Warnings and Precautions (5.4)]. Lactic Acidosis/Severe Hepatomegaly with Steatosis [see Warnings and Precautions (5.5)]. Most common adverse reactions (incidence greater than or equal to 5%, all grades) are diarrhea, nausea, and headache. (6.1)To report SUSPECTED ADVERSE REACTIONS, contact Gilead Sciences, Inc. at 1-800-GILEAD-5 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.. 6.1Clinical Trials Experience. Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.. Clinical Trials in Adults with No Antiretroviral Treatment HistoryThe primary safety assessment of BIKTARVY was based on Week 48 data from two randomized, double-blind, active-controlled trials, Trial 1489 and Trial 1490, that enrolled 1274 HIV-1 infected adult subjects with no antiretroviral treatment history. total of 634 subjects received one tablet of BIKTARVY once daily [see Clinical Studies (14.2)].The most common adverse reactions (all Grades) reported in at least 5% of subjects in the BIKTARVY group in either Trial 1489 or Trial 1490 were diarrhea, nausea, and headache. The proportion of subjects who discontinued treatment with BIKTARVY, abacavir [ABC]/dolutegravir [DTG]/ lamivudine [3TC]), or DTG FTC/TAF, due to adverse events, regardless of severity, was 1%, 1%, and <1%, respectively. Table displays the frequency of adverse reactions (all Grades) greater than or equal to 2% in the BIKTARVY group.Table 1Adverse ReactionsFrequencies of adverse reactions are based on all adverse events attributed to trial drugs by the investigator. No adverse reactions of Grade or higher occurred in >= 1% of subjects treated with BIKTARVY. (All Grades) Reported in >= 2% of HIV-1 Infected Adults with No Antiretroviral Treatment History Receiving BIKTARVY in Trials 1489 or 1490 (Week 48 analysis)Trial 1489Trial 1490Adverse ReactionsBIKTARVY N=314ABC/DTG/3TC N=315BIKTARVY N=320DTG FTC/TAF N=325Diarrhea6%4%3%3%Nausea5%17%3%5%Headache5%5%4%3%Fatigue3%3%2%2%Abnormal dreams3%3%<1%1%Dizziness2%3%2%1%Insomnia2%3%2%<1%Additional adverse reactions (all Grades) occurring in less than 2% of subjects administered BIKTARVY in Trials 1489 and 1490 included vomiting, flatulence, dyspepsia, abdominal pain, rash, and depression.Suicidal ideation, suicide attempt, and depression suicidal occurred in <1% of subjects administered BIKTARVY; all events were serious and primarily occurred in subjects with preexisting history of depression, prior suicide attempt or psychiatric illness.The majority (87%) of adverse events associated with BIKTARVY were Grade 1.. Clinical Trials in Virologically Suppressed AdultsThe safety of BIKTARVY in virologically-suppressed adults was based on Week 48 data from 282 subjects in randomized, double-blind, active-controlled trial (Trial 1844) in which virologically-suppressed subjects were switched from either DTG ABC/3TC or ABC/DTG/3TC to BIKTARVY; and Week 48 data from 290 subjects in an open-label, active-controlled trial in which virologically-suppressed subjects were switched from regimen containing atazanavir (ATV) (given with cobicistat or ritonavir) or darunavir (DRV) (given with cobicistat or ritonavir) plus either FTC/TDF or ABC/3TC, to BIKTARVY (Trial 1878). Overall, the safety profile in virologically-suppressed adult subjects in Trials 1844 and 1878 was similar to that in subjects with no antiretroviral treatment history [see Clinical Studies (14.3)].. Clinical Trial in Adults with End Stage Renal Disease (ESRD) Receiving Chronic HemodialysisThe safety of FTC and TAF (components of BIKTARVY) was evaluated in single arm, open-label trial (Trial 1825) in virologically-suppressed adults with ESRD (estimated creatinine clearance of less than 15 mL/min) on chronic hemodialysis treated with FTC+TAF in combination with elvitegravir and cobicistat as fixed-dose combination tablet for 96 weeks (N=55). The most commonly reported adverse reaction (adverse event assessed as causally related by investigator and all grades) was nausea (7%). Serious adverse events were reported in 65% of subjects and the most common serious adverse events were pneumonia (15%), fluid overload (7%), hyperkalemia (11%) and osteomyelitis (7%). Overall 7% of subjects permanently discontinued treatment due to an adverse event. In an extension phase of Trial 1825 in which 10 subjects switched to BIKTARVY for 48 weeks, the safety findings were similar to those in the initial phase of the open-label trial [see Use in Specific Populations (8.6), Clinical Studies (14.3)].. Laboratory AbnormalitiesThe frequency of laboratory abnormalities (Grades 3-4) occurring in at least 2% of subjects receiving BIKTARVY in Trials 1489 and 1490 are presented in Table 2.Table 2Laboratory Abnormalities (Grades 3-4) Reported in >= 2% of Subjects Receiving BIKTARVY in Trials 1489 or 1490 (Week 48 analysis)Trial 1489Trial 1490Laboratory Parameter AbnormalityFrequencies are based on treatment-emergent laboratory abnormalities. BIKTARVY N=314ABC/DTG/3TC N=315BIKTARVY N=320DTG FTC/TAF N=325ULN Upper limit of normalAmylase (>2.0 ULN)2%2%2%2%ALT (>5.0 ULN)1%1%2%1%AST (>5.0 ULN)2%1%1%3%Creatine Kinase (>=10.0 ULN)4%3%4%2%Neutrophils (<750 mm3)2%3%2%1%LDL-cholesterol (fasted) (>190 mg/dL)2%3%3%3%. Changes in Serum Creatinine: BIC has been shown to increase serum creatinine due to inhibition of tubular secretion of creatinine without affecting renal glomerular function [see Clinical Pharmacology (12.2)]. Increases in serum creatinine occurred by Week of treatment and remained stable through Week 48. In Trials 1489 and 1490, median (Q1, Q3) serum creatinine increased by 0.10 (0.03, 0.17) mg per dL from baseline to Week 48 in the BIKTARVY group and was similar to the comparator groups who received ABC/DTG/3TC, or DTG FTC/TAF. There were no discontinuations due to renal adverse events and renal serious adverse events were encountered in less than 1% of participants treated with BIKTARVY through Week 48 in clinical trials.. Changes in Bilirubin: In Trials 1489 and 1490, total bilirubin increases were observed in 12% of subjects administered BIKTARVY through Week 48. Increases were primarily Grade (1.0 to 1.5 ULN) (9%) and Grade (1.5 to 2.5 ULN) (3%). Graded bilirubin increases in the ABC/DTG/3TC, and DTG FTC/TAF groups, were 4% and 6%, respectively. Increases were primarily Grade (3% ABC/DTG/3TC and 5% DTG FTC/TAF) or Grade (1% ABC/DTG/3TC and 1% DTG FTC/TAF). There were no discontinuations due to hepatic adverse events through Week 48 in BIKTARVY clinical studies.. Clinical Trials in Pediatric SubjectsThe safety of BIKTARVY was evaluated in HIV-1 infected virologically-suppressed subjects between the ages of 12 to less than 18 years and weighing at least 35 kg (N=50) through Week 48 (cohort 1), in virologically-suppressed subjects between the ages of to less than 12 years and weighing at least 25 kg (N=50) through Week 24 (cohort 2), and in virologically suppressed subjects at least years of age and weighing at least 14 to less than 25 kg (N=22) through Week 24 (cohort 3) in an open label clinical trial (Trial 1474) [see Clinical Studies (14.4)]. No new adverse reactions or laboratory abnormalities were identified compared to those observed in adults. Adverse reactions were reported in 11% of pediatric subjects. The majority (76%) of adverse reactions were Grade 1. No Grade or adverse reactions were reported. The adverse reaction reported by more than one subject (regardless of severity) was abdominal discomfort (n=2). One subject (1%) had Grade adverse reactions of insomnia and anxiety that led to discontinuation of BIKTARVY. The other adverse reactions that occurred in single subjects were similar to those seen in adults.. 6.2Postmarketing Experience. The following events have been identified during post approval use of BIKTARVY or products containing TAF. Because these events are reported voluntarily from population of uncertain size, it is not always possible to reliably estimate their frequency or establish causal relationship to drug exposure.. Renal and Urinary DisordersAcute renal failure, acute tubular necrosis, proximal renal tubulopathy, and Fanconi syndrome. Skin and Subcutaneous Tissue DisordersAngioedema, Stevens-Johnson syndrome/toxic epidermal necrolysis, and urticaria.

CLINICAL PHARMACOLOGY SECTION.

12CLINICAL PHARMACOLOGY. 12.1Mechanism of Action. BIKTARVY is fixed dose combination of antiretroviral drugs bictegravir (BIC), emtricitabine (FTC), and tenofovir alafenamide (TAF) [see Microbiology (12.4)].. 12.2Pharmacodynamics. Cardiac ElectrophysiologyIn thorough QT/QTc trial in 48 healthy subjects, BIC at doses 1.5 and times the recommended dose did not affect the QT/QTc interval and did not prolong the PR interval. In thorough QT/QTc trial in 48 healthy subjects, TAF at the recommended dose or at dose times the recommended dose, did not affect the QT/QTc interval and did not prolong the PR interval. The effect of FTC on the QT interval is not known.. Effects on Serum CreatinineMean change from baseline in serum creatinine in healthy subjects who received BIC 75 mg (1.5 times the approved recommended dosage) once daily with food for 14 days was 0.1 mg per dL on Days and 14 compared to placebo. BIC did not have significant effect on the estimated creatinine clearance or on the actual glomerular filtration rate (determined by the clearance of probe drug, iohexol).. 12.3Pharmacokinetics. The pharmacokinetic (PK) properties of BIKTARVY components are provided in Table 4. The multiple dose PK parameters of BIKTARVY components (based on population pharmacokinetic analysis) are provided in Table 5.Table 4Pharmacokinetic Properties of the Components of BIKTARVYBictegravir (BIC)Emtricitabine (FTC)Tenofovir Alafenamide (TAF)PBMCs=peripheral blood mononuclear cells; CES1=carboxylesterase 1AbsorptionTmax (h)Values reflect administration of BIKTARVY with or without food. 2.0-4.01.5-2.00.5-2.0Effect of high-fat meal (relative to fasting)Values refer to geometric mean ratio [high-fat meal/ fasting] in PK parameters and (90% confidence interval). High fat meal is approximately 800 kcal, 50% fat. AUC ratio1.24 (1.16, 1.33)0.96 (0.93, 0.99)1.63 (1.43, 1.85)Cmax ratio1.13 (1.06, 1.20)0.86 (0.78, 0.93)0.92 (0.73, 1.14)Distribution% bound to human plasma proteins>99<4~80Blood-to-plasma ratio0.640.61.0Eliminationt1/2 (h)t1/2 values refer to median (Q1, Q3) terminal plasma half-life. Note that the active metabolite of TAF, tenofovir diphosphate, has half-life of 150-180 hours within PBMCs. 17.3 (14.8, 20.7)10.4 (9.0, 12.0)0.51 (0.45, 0.62) Metabolism Metabolic pathway(s)CYP3AUGT1A1Not significantly metabolizedCathepsin AIn vivo, TAF is hydrolyzed within cells to form tenofovir (major metabolite), which is phosphorylated to the active metabolite, tenofovir diphosphate. In vitro studies have shown that TAF is metabolized to tenofovir by cathepsin in PBMCs and macrophages; and by CES1 in hepatocytes. (PBMCs)CES1 (hepatocytes)ExcretionMajor route of eliminationMetabolismGlomerular filtration and active tubular secretionMetabolism% of dose excreted in urineDosing in mass balance studies: single dose administration of [14C] BIC; single dose administration of [14C] FTC after multiple dosing of FTC for ten days; single dose administration of [14C] TAF. 3570<1% of dose excreted in feces 60.313.731.7Table 5Multiple Dose PK Parameters of BIC, FTC, and TAF Following Oral Administration of BIKTARVY in HIV-Infected AdultsParameter Mean (CV%)BictegravirEmtricitabineTenofovir AlafenamideCV=Coefficient of Variation; NA=Not ApplicableCmax (microgram per mL)6.15 (22.9)2.13 (34.7)0.121 (15.4)AUCtau (microgramh per mL)102 (26.9)12.3 (29.2)0.142 (17.3)Ctrough (microgram per mL)2.61 (35.2)0.096 (37.4)NA. Specific Populations. Patients with Renal ImpairmentNo clinically relevant differences in the pharmacokinetics of BIC, TAF, or its metabolite tenofovir were observed between subjects with severe renal impairment (estimated creatinine clearance of 15 to less than 30 mL/min, by Cockcroft-Gault method) and healthy subjects in Phase studies. In separate Phase study of FTC alone, FTC exposures were increased in subjects with severe renal impairment.The pharmacokinetics of BIC, FTC and TAF were evaluated in subset of HIV-1 infected virologically-suppressed subjects with ESRD (estimated creatinine clearance less than 15 mL/min, by Cockcroft-Gault method) receiving chronic hemodialysis in Trial 1825. The pharmacokinetics of TAF were similar between healthy subjects and subjects with ESRD receiving chronic hemodialysis; increases in FTC and tenofovir exposures in subjects with ESRD were not considered clinically relevant. Median (minimum, maximum) BIC Ctrough values in subjects (n=7) with ESRD who received BIKTARVY were 846 ng/mL (288, 1810) compared to 2540 ng/mL (757, 6499) in subjects (N=584) with normal renal function. Despite significantly lower BIC Ctrough values in the virologically-suppressed ESRD population, virologic suppression was maintained [see Use in Specific Populations (8.6), Clinical Studies (14.3)].. Patients with Hepatic Impairment. Bictegravir: Clinically relevant changes in the pharmacokinetics of BIC were not observed in subjects with moderate (Child-Pugh Class B) hepatic impairment.. Emtricitabine: The pharmacokinetics of FTC has not been studied in subjects with hepatic impairment; however, FTC is not significantly metabolized by liver enzymes, so the impact of hepatic impairment should be limited.. Tenofovir Alafenamide: Clinically relevant changes in the pharmacokinetics of TAF or its metabolite tenofovir were not observed in subjects with mild or moderate (Child-Pugh Class and B) hepatic impairment [see Use in Specific Populations (8.7)].. Hepatitis and/or Hepatitis Virus CoinfectionThe pharmacokinetics of BIC, FTC, and TAF have not been evaluated in subjects coinfected with hepatitis and/or virus.. Geriatric PatientsThe pharmacokinetics of BIC, FTC, and TAF have not been fully evaluated in the elderly (65 years of age and older). Population pharmacokinetics analysis of HIV-infected subjects in Phase trials of BIKTARVY showed that age did not have clinically relevant effect on exposures of BIC and TAF up to 74 years of age [see Use in Specific Populations (8.5)].. Pediatric PatientsMean BIC Ctrough was lower in 50 pediatric patients aged 12 to less than 18 years and weighing at least 35 kg who received BIKTARVY in Trial 1474 relative to adults following administration of BIKTARVY, but was not considered clinically significant based on exposure-response relationships; exposures of FTC and TAF in these pediatric patients were similar to those in adults (Table 6).Table 6Multiple Dose PK Parameters of BIC, FTC, and TAF Following Oral Administration of BIKTARVY in HIV-Infected Pediatric Subjects Aged 12 to less than 18 yearsParameter Mean (CV%)BictegravirFrom Population PK analysis of cohort of Trial 1474 (n=50 for BIC; n=49 for TAF). EmtricitabineFrom Intensive PK analysis of cohort of Trial 1474 (n=24). Tenofovir Alafenamide CV=Coefficient of Variation; NA=Not ApplicableCmax (microgram per mL) 6.24 (27.1)2.69 (34.0)0.133 (70.2)AUCtau (microgramh per mL)89.1 (31.0)13.6 (21.7)0.196 (50.3)Ctrough (microgram per mL)1.78 (44.4)0.064 (25.0)NAMean BIC Cmax, and exposures of FTC and TAF (AUCtau and Cmax) achieved in 50 pediatric patients between the ages of to less than 12 years and weighing at least 25 kg, and in 22 pediatric patients at least years of age and weighing at least 14 to less than 25 kg who received BIKTARVY in Trial 1474 were higher than exposures in adults; however, the increases were not considered clinically significant as the safety profiles were similar in adult and pediatric patients (Tables and 8) [see Use in Specific Populations (8.4)].Table 7Multiple Dose PK Parameters of BIC, FTC, and TAF Following Oral Administration of BIKTARVY in HIV-Infected Pediatric Subjects Aged to less than 12 yearsParameter Mean (CV%)BictegravirFrom Population PK analysis of cohort of Trial 1474 (n=50 for BIC; n=47 for TAF). EmtricitabineFrom Intensive PK analysis of cohort of Trial 1474 (n=25 except n=24 for Ctrough). Tenofovir Alafenamide CV=Coefficient of Variation; NA=Not ApplicableCmax (microgram per mL) 9.46 (24.3)3.89 (31.0)0.205 (44.6)AUCtau (microgramh per mL)128 (27.8)17.6 (36.9)0.278 (40.3)Ctrough (microgram per mL)2.36 (39.0)0.227 (323)NATable 8Multiple Dose PK Parameters of BIC, FTC, and TAF Following Oral Administration of BIKTARVY in HIV-Infected Pediatric Subjects at Least Years of AgeCohort of Trial 1474 enrolled pediatric subjects from to years of age. and Weighing at Least 14 to Less than 25 kgParameter Mean (CV%)BictegravirFrom Population PK analysis of cohort of Trial 1474 (n=22). EmtricitabineFrom Intensive PK analysis of cohort of Trial 1474 (n=12 except n=11 for Ctrough for FTC). Tenofovir Alafenamide CV=Coefficient of Variation; NA=Not ApplicableCmax (microgram per mL) 9.15 (44.8)3.85 (34.7)0.414 (31.0)AUCtau (microgramh per mL)126 (42.4)15.0 (21.9)0.305 (42.6)Ctrough (microgram per mL)2.43 (40.1)0.210 (243)NA. Race and GenderNo clinically relevant changes in the pharmacokinetics of BIC, FTC, and TAF were observed based on gender or race.. Drug Interaction StudiesAs BIKTARVY is complete regimen for the treatment of HIV-1 infection, comprehensive information regarding potential drug-drug interactions with other antiretroviral agents is not provided.BIC is substrate of CYP3A and UGT1A1.BIC is an inhibitor of OCT2 and MATE1. At clinically relevant concentrations, BIC is not an inhibitor of hepatic transporters OATP1B1, OATP1B3, OCT1, BSEP, renal transporters OAT1 and OAT3, or CYP (including CYP3A) or UGT1A1 enzymes.TAF is substrate of P-gp and BCRP.At clinically relevant concentrations, TAF is not an inhibitor of drug transporters P-gp, BCRP, hepatic transporters OATP1B1, OATP1B3, OCT1, BSEP, renal transporters OAT1, OAT3, OCT2, MATE1, or CYP (including CYP3A) or UGT1A1 enzymes.Drug interaction studies were conducted with BIKTARVY or its components. Tables and 10 summarize the pharmacokinetic effects of other drugs on BIC and TAF, respectively. Table 11 summarizes the pharmacokinetic effects of BIKTARVY or its components on other drugs.. Effect of Other Drugs on BIKTARVY ComponentsTable 9Effect of Other Drugs on BICAll interaction studies conducted in healthy volunteers. Coadministered DrugDose of Coadministered Drug (mg)BIC (mg)Mean Ratio of BIC Pharmacokinetic Parameters (90% CI); No effect 1.00Cmax AUCCmin NA= Not ApplicableLedipasvir/Sofosbuvir (fed)90/400 once daily75 once daily0.98(0.94, 1.03)1.00(0.97, 1.03)1.04(0.99, 1.09)Rifabutin (fasted)300 once daily75 once daily0.80(0.67, 0.97)0.62(0.53, 0.72)0.44(0.37, 0.52)Rifampin (fed)600 once daily75 single dose0.72(0.67, 0.78)0.25(0.22, 0.27)NASofosbuvir/ velpatasvir/ voxilaprevir (fed)400/100/100+100 voxilaprevirStudy conducted with additional voxilaprevir 100 mg to achieve voxilaprevir exposures expected in HCV-infected patients. once daily50 once daily0.98(0.94, 1.01)1.07(1.03, 1.10)1.10(1.05, 1.17)Voriconazole (fasted)300 twice daily75 single dose1.09(0.96, 1.23)1.61(1.41, 1.84)NAMaximum strength antacid (simultaneous administration, fasted)20 mLMaximum strength antacid contained 80 mg aluminum hydroxide, 80 mg magnesium hydroxide, and mg simethicone, per mL. single dose (oral)50 single dose0.20(0.16, 0.24)0.21(0.18, 0.26)NAMaximum strength antacid (2 after BIKTARVY fasted)20 mL single dose (oral)50 single dose0.93(0.88, 1.00)0.87(0.81, 0.93)NAMaximum strength antacid (2 before BIKTARVY fasted)20 mL single dose (oral)50 single dose0.42(0.33, 0.52)0.48(0.38, 0.59)NAMaximum strength antacid (simultaneous administration, fedReference treatment administered under fasted conditions.)20 mL single dose (oral)50 single dose0.51(0.43, 0.62)0.53(0.44, 0.64)NACalcium carbonate (simultaneous administration, fasted)1200 single dose50 single dose0.58(0.51, 0.67)0.67(0.57, 0.78)NACalcium carbonate (simultaneous administration, fed)1200 single dose50 single dose0.90(0.78, 1.03)1.03(0.89, 1.20)NAFerrous fumarate (simultaneous administration, fasted)324 single dose50 single dose0.29(0.26, 0.33)0.37(0.33, 0.42)NAFerrous fumarate (simultaneous administration, fed)324 single dose50 single dose0.75(0.65, 0.87)0.84(0.74, 0.95)NATable 10 Effect of Other Drugs on TAFAll interaction studies conducted in healthy volunteers. Coadministered DrugDose of Coadministered Drug (mg)Tenofovir Alafenamide (mg)Mean Ratio of Tenofovir Alafenamide Pharmacokinetic Parameters (90% CI); No effect 1.00Cmax AUCCmin NA= Not ApplicableCarbamazepine300 twice daily25 single doseStudy conducted with emtricitabine/tenofovir alafenamide. 0.43(0.36, 0.51)0.46(0.40, 0.54)NALedipasvir/sofosbuvir90/400 once daily25 once daily1.17(1.00, 1.38)1.27(1.19, 1.34)NASofosbuvir/ velpatasvir/ voxilaprevir400/100/100 +100 voxilaprevirStudy conducted with additional voxilaprevir 100 mg to achieve voxilaprevir exposures expected in HCV-infected patients. once daily25 once daily1.28(1.09, 1.51)1.57(1.44, 1.71)NA. Effect of BIKTARVY Components on Other DrugsTable 11 Effect of Components of BIKTARVY on Other DrugsAll interaction studies conducted in healthy volunteers. Coadministered DrugDose of Coadministered Drug (mg)BIC (mg)TAF (mg)Mean Ratio of Coadministered Drug Pharmacokinetic Parameters (90% CI); No effect 1.00Cmax AUCCmin NA= Not ApplicableLedipasvir90/400 once daily75 once daily25 once daily0.85(0.81, 0.90)0.87(0.83, 0.92)0.90(0.84, 0.96)Sofosbuvir1.11(1.00, 1.24)1.07(1.01, 1.13)NAGS-331007The predominant circulating nucleoside metabolite of sofosbuvir. 1.10(1.07, 1.13)1.11(1.08, 1.14)1.02(0.99, 1.06)Metformin500 twice daily50 once daily25 once daily1.28(1.21, 1.36)1.39(1.31, 1.48)1.36(1.21, 1.53)Midazolam2 single dose50 once daily25 once daily1.03(0.87, 1.23)1.15(1.00, 1.31)NANorelgestrominnorgestimate 0.180/0.215/0.250 once daily /ethinyl estradiol 0.025 once daily75 once daily-1.23(1.14, 1.32)1.08(1.05, 1.10)1.10(1.05, 1.15)Norgestrel1.15(1.10, 1.21)1.13(1.07, 1.19)1.14(1.06, 1.22)Ethinyl estradiol1.15(1.03, 1.27)1.04(0.99, 1.10)1.05(0.95, 1.14)Norelgestrominnorgestimate 0.180/0.215/0.250 once daily ethinyl estradiol 0.025 once daily-25 once dailyStudy conducted with emtricitabine/tenofovir alafenamide. 1.17(1.07,1.26)1.12(1.07,1.17)1.16(1.08, 1.24)Norgestrel1.10(1.02, 1.18)1.09(1.01, 1.18)1.11(1.03, 1.20)Ethinyl estradiol1.22(1.15, 1.29)1.11(1.07, 1.16)1.02(0.92, 1.12)Sertraline50 single dose-10 once dailyStudy conducted with elvitegravir/cobicistat/emtricitabine/tenofovir alafenamide. 1.14(0.94, 1.38)0.93(0.77, 1.13)NASofosbuvir400/100/100+100Study conducted with additional voxilaprevir 100 mg to achieve voxilaprevir exposures expected in HCV-infected patients. once daily50 once daily25 once daily1.14(1.04,1.25)1.09(1.02, 1.15)NAGS-331007 1.03(0.99,1.06)1.03(1.00,1.06)1.01(0.98, 1.05)Velpatasvir0.96(0.91,1.01)0.96(0.90, 1.02)0.94(0.88, 1.01)Voxilaprevir0.90(0.76, 1.06)0.91(0.80, 1.03)0.97(0.88, 1.06). 12.4Microbiology. Mechanism of Action. Bictegravir: BIC inhibits the strand transfer activity of HIV-1 integrase (integrase strand transfer inhibitor; INSTI), an HIV-1 encoded enzyme that is required for viral replication. Inhibition of integrase prevents the integration of linear HIV-1 DNA into host genomic DNA, blocking the formation of the HIV-1 provirus and propagation of the virus.. Emtricitabine: FTC, synthetic nucleoside analog of cytidine, is phosphorylated by cellular enzymes to form emtricitabine 5-triphosphate. Emtricitabine 5-triphosphate inhibits the activity of the HIV-1 reverse transcriptase by competing with the natural substrate deoxycytidine 5-triphosphate and by being incorporated into nascent viral DNA which results in chain termination. Emtricitabine 5-triphosphate is weak inhibitor of mammalian DNA polymerases , E, and mitochondrial DNA polymerase .. Tenofovir Alafenamide: TAF is phosphonamidate prodrug of tenofovir (2-deoxyadenosine monophosphate analog). Plasma exposure to TAF allows for permeation into cells and then TAF is intracellularly converted to tenofovir through hydrolysis by cathepsin A. Tenofovir is subsequently phosphorylated by cellular kinases to the active metabolite tenofovir diphosphate. Tenofovir diphosphate inhibits HIV-1 replication through incorporation into viral DNA by the HIV reverse transcriptase, which results in DNA chain-termination. Tenofovir diphosphate is weak inhibitor of mammalian DNA polymerases that include mitochondrial DNA polymerase and there is no evidence of toxicity to mitochondria in cell culture.. Antiviral Activity in Cell CultureThe triple combination of BIC, FTC, and TAF was not antagonistic with respect to antiviral activity in cell culture.. Bictegravir: The antiviral activity of BIC against laboratory and clinical isolates of HIV-1 was assessed in lymphoblastoid cell lines, PBMCs, primary monocyte/macrophage cells, and CD4+ T-lymphocytes. In MT-4 cells (human lymphoblastoid T-cell line) acutely infected with HIV-1 IIIB, the mean 50% effective concentration (EC50) was 2.4+-0.4 nM, and the protein-adjusted EC95 value was 361 nM (0.162 micrograms per mL). BIC displayed antiviral activity in activated PBMCs against clinical isolates of HIV-1 representing groups M, N, and O, including subtypes A, B, C, D, E, F, and G, with median EC50 value of 0.55 nM (range <0.05 to 1.71 nM). The EC50 value against single HIV-2 isolate was 1.1 nM.. Emtricitabine: The antiviral activity of FTC against laboratory and clinical isolates of HIV-1 was assessed in lymphoblastoid cell lines, the MAGI-CCR5 cell line, and PBMCs. In PBMCs acutely infected with HIV-1 subtypes A, B, C, D, E, F, and G, the median EC50 value for FTC was 9.5 nM (range to 30 nM) and against HIV-2 was nM.. Tenofovir Alafenamide: The antiviral activity of TAF against laboratory and clinical isolates of HIV-1 subtype was assessed in lymphoblastoid cell lines, PBMCs, primary monocyte/macrophage cells and CD4-T lymphocytes. The EC50 values for TAF ranged from 2.0 to 14.7 nM. TAF displayed antiviral activity in cell culture against all HIV-1 groups (M, N, O), including subtypes A, B, C, D, E, F, and (EC50 values ranged from 0.1 to 12 nM) and strain specific activity against HIV-2 (EC50 values ranged from 0.9 to 2.6 nM).. Resistance. In Cell Culture. Bictegravir: HIV-1 isolates with reduced susceptibility to BIC have been selected in cell culture. In one selection with BIC, virus pool emerged expressing amino acid substitutions M50I and R263K in the HIV-1 integrase. M50I, R263K, and M50I+R263K substitutions, when introduced into wild-type virus by site-directed mutagenesis, conferred 1.3-, 2.2-, and 2.9-fold reduced susceptibility to BIC, respectively. In second selection, emergence of amino acid substitutions T66I and S153F was detected, and 0.4-, 1.9-, and 0.5-fold reductions in BIC susceptibility were observed with T66I, S153F, and T66I+S153F, respectively. In addition, S24G and E157K substitutions emerged during the selection process.. Emtricitabine: HIV-1 isolates with reduced susceptibility to FTC were selected in cell culture and in subjects treated with FTC. Reduced susceptibility to FTC was associated with M184V or substitutions in HIV-1 RT.. Tenofovir Alafenamide: HIV-1 isolates with reduced susceptibility to TAF were selected in cell culture. HIV-1 isolates selected by TAF expressed K65R substitution in HIV-1 RT, sometimes in the presence of S68N or L429I substitutions; in addition, K70E substitution in HIV-1 RT was observed.. In Clinical Trials. In Subjects with No Antiretroviral Treatment History: Pooled genotypic resistance analyses were performed on paired baseline and on-treatment HIV-1 isolates from subjects receiving BIKTARVY through Week 48 in Trials 1489 and 1490 [see Clinical Studies (14.2)] who had HIV-1 RNA greater than or equal to 200 copies/mL at the time of confirmed virologic failure, Week 48, or early study drug discontinuation. No specific amino acid substitutions emerged consistently in the treatment failure subjects with evaluable genotypic resistance data and failed to establish an association with genotypic BIC resistance. There were no treatment-emergent NRTI resistance-associated substitutions detected in the evaluated treatment failure isolates. Phenotypic resistance analyses of failure isolates found fold-changes in drug susceptibility below the biological or clinical cutoffs for BIC, FTC, and TFV, compared to wild-type reference HIV-1.. In Virologically Suppressed Adult Subjects: In switch trials, Trials 1844 and 1878 [see Clinical Studies (14.3)], of virologically suppressed HIV-1 infected subjects (n=572), only one subject with virologic rebound in the resistance analysis population had IN genotypic and phenotypic data, and rebounders had RT genotypic and phenotypic data. No subjects had HIV-1 with treatment-emergent genotypic or phenotypic resistance to BIC, FTC, or TAF.. In Virologically Suppressed Pediatric Subjects: In Trial 1474 [see Clinical Studies (14.4)], two of 50 subjects in cohort were evaluated for the development of resistance through Week 48; no amino acid substitutions known to be associated with resistance to BIC, FTC, or TFV were detected. No subjects in cohort or met the criteria for resistance analyses through Week 24.. Cross-Resistance. Bictegravir: Cross-resistance has been observed among INSTIs. The susceptibility of BIC was tested against 64 clinical isolates expressing known INSTI resistance-associated substitutions listed by IAS-USA (20 with single substitutions and 44 with or more substitutions). Isolates with single INSTI-resistance substitution including E92Q, T97A, Y143C/R, Q148R, and N155H showed less than 2-fold reduced susceptibility to BIC. All isolates (n=14) with more than 2.5-fold reduced susceptibility to BIC (above the biological cutoff for BIC) contained G140A/C/S and Q148H/R/K substitutions; the majority (64.3%, 9/14) had complex INSTI resistance pattern with an additional INSTI-resistance substitution L74M, T97A, or E138A/K. Of those evaluated isolates containing G140A/C/S and Q148H/R/K substitutions in the absence of additional INSTI-resistance substitutions, 38.5% (5/13) showed more than 2.5-fold reduction. In addition, site-directed mutant viruses with G118R (dolutegravir and raltegravir treatment-emergent substitution) and G118R+T97A had 3.4- and 2.8-fold reduced susceptibility to BIC, respectively.BIC demonstrated equivalent antiviral activity with less than 2-fold reductions in susceptibility against HIV-1 variants expressing substitutions associated with resistance to NNRTIs, NRTIs, and PIs, compared with the wild-type virus.. Emtricitabine: Cross-resistance has been observed among NRTIs. FTC-resistant viruses with an M184V/I substitution in HIV-1 RT were cross-resistant to lamivudine. HIV-1 isolates containing the K65R RT substitution, selected in vivo by abacavir, didanosine, and tenofovir, demonstrated reduced susceptibility to inhibition by FTC.. Tenofovir Alafenamide: Cross-resistance has been observed among NRTIs. Tenofovir resistance substitutions K65R and K70E result in reduced susceptibility to abacavir, didanosine, emtricitabine, lamivudine, and tenofovir. HIV-1 with multiple thymidine analog substitutions (M41L, D67N, K70R, L210W, T215F/Y, K219Q/E/N/R), or multinucleoside resistant HIV-1 with T69S double insertion mutation or with Q151M substitution complex including K65R, showed reduced susceptibility to TAF in cell culture.

CLINICAL STUDIES SECTION.

14CLINICAL STUDIES. 14.1Description of Clinical Trials. The efficacy and safety of BIKTARVY were evaluated in the trials summarized in Table 12.Table 12Trials Conducted with BIKTARVY in Subjects with HIV-1 InfectionTrialPopulationTrial Arms (N)Timepoint (Week)Trial 1489Randomized, double blind, active controlled trial. (NCT 02607930)Adults with no antiretroviral treatment historyBIKTARVY (314)ABC/DTG/3TC (315)48Trial 1490 (NCT 02607956)BIKTARVY (320)DTG FTC/TAF(325)48Trial 1844 (NCT 02603120)Virologically-suppressedHIV-1 RNA less than 50 copies per mL. adultsBIKTARVY (282)ABC/DTG/3TC (281)48Trial 1878Randomized, open label, active controlled trial. (NCT 02603107)BIKTARVY (290) ATV or DRV (with cobicistat or ritonavir) plus either FTC/TDF or ABC/3TC (287)48Trial 1825Open label trial. (NCT 02600819)Virologically-suppressed adults with ESRDEnd stage renal disease (estimated creatinine clearance of less than 15 mL/min by Cockcroft-Gault method). receiving chronic hemodialysisFTC+TAF in combination with elvitegravir and cobicistat as fixed-dose combination (55). In an extension phase of Trial 1825, 10 virologically-suppressed subjects switched to BIKTARVY.48Subjects received FTC+TAF in combination with elvitegravir and cobicistat for 96 weeks, followed by an extension phase in which 10 subjects received BIKTARVY for 48 weeks. Trial 4449 (NCT 03405935)Virologically-suppressed adults aged 65 years and overBIKTARVY (86)48Trial 1474 (cohort 1)(NCT 02881320)Virologically-suppressed adolescents between the ages of 12 to less than 18 years (at least 35 kg)BIKTARVY (50)48Trial 1474 (cohort 2)(NCT 02881320)Virologically-suppressed children between the ages of to less than 12 years (at least 25 kg)BIKTARVY (50)24Trial 1474 (cohort 3)(NCT 02881320)Virologically-suppressed children at least years of age (at least 14 to less than 25 kg)BIKTARVY (22)24. 14.2Clinical Trial Results in Adults with HIV-1 and No Antiretroviral Treatment History. In Trial 1489, adults were randomized in 1:1 ratio to receive either BIKTARVY (containing 50 mg of BIC, 200 mg of FTC, and 25 mg of TAF) (N=314) or ABC/DTG/3TC (600 mg/50 mg/300 mg) (N=315) once daily. In Trial 1490, subjects were randomized in 1:1 ratio to receive either BIKTARVY (N=320) or DTG FTC/TAF (50 mg 200 mg/25 mg) (N=325) once daily.In Trial 1489, the mean age was 34 years (range 18-71), 90% were male, 57% were White, 36% were Black, and 3% were Asian. 22% of patients identified as Hispanic/Latino. The mean baseline plasma HIV-1 RNA was 4.4 log10 copies/mL (range 1.3-6.5). The mean baseline CD4+ cell count was 464 cells per mm3 (range 0-1424) and 11% had CD4+ cell counts less than 200 cells per mm3. 16% of subjects had baseline viral loads greater than 100,000 copies per mL.In Trial 1490, the mean age was 37 years (range 18-77), 88% were male, 59% were White, 31% were Black, and 3% were Asian. 25% of patients identified as Hispanic/Latino. The mean baseline plasma HIV-1 RNA was 4.4 log10 copies/mL (range 2.3-6.6). The mean baseline CD4+ cell count was 456 cells per mm3 (range 2-1636) and 12% had CD4+ cell counts less than 200 cells per mm3. 19% of subjects had baseline viral loads greater than 100,000 copies per mL.In both trials, subjects were stratified by baseline HIV-1 RNA (less than or equal to 100,000 copies per mL, greater than 100,000 copies per mL to less than or equal to 400,000 copies per mL, or greater than 400,000 copies per mL), by CD4 count (less than 50 cells per mm3, 50-199 cells per mm3, or greater than or equal to 200 cells per mm3), and by region (US or ex-US).Treatment outcomes of Trials 1489 and 1490 through Week 48 are presented in Table 13.Table 13 Virologic Outcomes of Randomized Treatment in Trials 1489 and 1490 at Week 48Week 48 window was between Day 295 and 378 (inclusive). in Adults with No Antiretroviral Treatment HistoryTrial 1489Trial 1490BIKTARVY(N=314)ABC/DTG/3TC(N=315)BIKTARVY(N=320)DTG FTC/TAF(N=325)HIV-1 RNA 50 copies/mL92%93%89%93%Treatment Difference (95% CI) BIKTARVY vs. Comparator-0.6% (-4.8% to 3.6%)-3.5% (-7.9% to 1.0%)HIV-1 RNA >= 50 copies/mLIncludes subjects who had >= 50 copies/mL in the Week 48 window; subjects who discontinued early due to lack or loss of efficacy; subjects who discontinued for reasons other than an adverse event (AE), death or lack or loss of efficacy and at the time of discontinuation had viral value of >= 50 copies/mL. 1%3%4%1%No Virologic Data at Week 48 Window7%4%6%6% Discontinued Study Drug Due to AE or DeathIncludes subjects who discontinued due to AE or death at any time point from Day through the time window if this resulted in no virologic data on treatment during the specified window. 01%1%1% Discontinued Study Drug Due to Other Reasons and Last Available HIV-1 RNA <50 copies/mLIncludes subjects who discontinued for reasons other than an AE, death, or lack or loss of efficacy, e.g., withdrew consent, loss to follow-up, etc. 5%3%3%4% Missing Data During Window but on Study Drug2%<1%2%1%Treatment outcomes were similar across subgroups by age, sex, race, baseline viral load, and baseline CD4+ cell count.In Trials 1489 and 1490, the mean increase from baseline in CD4+ count at Week 48 was 233 and 229 cells per mm3 in the BIKTARVY and ABC/DTG/3TC groups, respectively, and 180 and 201 cells per mm3 in the BIKTARVY and DTG FTC/TAF groups, respectively.. 14.3Clinical Trial Results in Adults with Virologically-Suppressed HIV-1 Who Switched to BIKTARVY. In Trial 1844, the efficacy and safety of switching from regimen of DTG ABC/3TC or ABC/DTG/3TC to BIKTARVY were evaluated in randomized, double-blind trial of virologically-suppressed (HIV-1 RNA less than 50 copies per mL) HIV-1 infected adults (N=563, randomized and dosed). Subjects must have been stably suppressed (HIV-1 RNA less than 50 copies per mL) on their baseline regimen for at least months prior to trial entry and had no history of treatment failure. Subjects were randomized in 1:1 ratio to either switch to BIKTARVY (containing 50 mg of BIC, 200 mg of FTC, and 25 mg of TAF) at baseline (N=282), or stay on their baseline antiretroviral regimen (N=281). Subjects had mean age of 45 years (range 20-71), 89% were male, 73% were White, and 22% were Black. 17% of subjects identified as Hispanic/Latino. The mean baseline CD4+ cell count was 723 cells per mm3 (range 124-2444).In Trial 1878, the efficacy and safety of switching from either ABC/3TC or FTC/TDF (200/300 mg) plus ATV or DRV (given with either cobicistat or ritonavir) to BIKTARVY (containing 50 mg of BIC, 200 mg of FTC, and 25 mg of TAF) were evaluated in randomized, open-label study of virologically-suppressed HIV-1 infected adults (N=577, randomized and dosed). Subjects must have been stably suppressed on their baseline regimen for at least months, must not have been previously treated with any INSTI, and had no history of treatment failure. Subjects were randomized in 1:1 ratio to either switch to BIKTARVY (N=290) or stay on their baseline antiretroviral regimen (N=287). Subjects had mean age of 46 years (range 20-79), 83% were male, 66% were White, and 26% were Black. 19% of subjects identified as Hispanic/Latino. The mean baseline CD4+ cell count was 663 cells per mm3 (range 62-2582). Subjects were stratified by prior treatment regimen. At screening, 15% of subjects were receiving ABC/3TC plus ATV or DRV (given with either cobicistat or ritonavir) and 85% of subjects were receiving FTC/TDF plus ATV or DRV (given with either cobicistat or ritonavir).Treatment outcomes of Trials 1844 and 1878 through Week 48 are presented in Table 14.Table 14Virologic Outcomes of Trials 1844 and 1878 at Week 48Week 48 window was between Day 295 and 378 (inclusive). in Virologically-Suppressed Adults who Switched to BIKTARVYTrial 1844Trial 1878BIKTARVY(N=282)ABC/DTG/3TC(N=281)BIKTARVY(N=290)ATV- or DRV-based regimenATV given with cobicistat or ritonavir or DRV given with cobicistat or ritonavir plus either FTC/TDF or ABC/3TC. (N=287)HIV-1 RNA >= 50 copies/mLIncludes subjects who had >= 50 copies/mL in the Week 48 window; subjects who discontinued early due to lack or loss of efficacy; subjects who discontinued for reasons other than lack or loss of efficacy and at the time of discontinuation had viral value of >= 50 copies/mL. 1%<1%2%2% Treatment Difference (95% CI)0.7% (-1.0% to 2.8%)0.0% (-2.5% to 2.5%)HIV-1 RNA 50 copies/mL94%95%92%89%No Virologic Data at Week 48 Window5%5%6%9% Discontinued Study Drug Due to AE or Death and Last Available HIV-1 RNA 50 copies/mL2%1%1%1% Discontinued Study Drug Due to Other Reasons and Last Available HIV-1 RNA 50 copies/mLIncludes subjects who discontinued for reasons other than an AE, death, or lack or loss of efficacy, e.g., withdrew consent, loss to follow-up, etc. 2%3%3%7% Missing Data During Window but on Study Drug2%1%2%2%In Trial 1844, treatment outcomes between treatment groups were similar across subgroups by age, sex, race, and region. The mean change from baseline in CD4+ count at Week 48 was -31 cells per mm3 in subjects who switched to BIKTARVY and cells per mm3 in subjects who stayed on ABC/DTG/3TC.In Trial 1878, treatment outcomes between treatment groups were similar across subgroups by age, sex, race, and region. The mean change from baseline in CD4+ count at Week 48 was 25 cells per mm3 in patients who switched to BIKTARVY and cells per mm3 in patients who stayed on their baseline regimen.In Trial 1825, an open-label single arm trial, the efficacy, safety, and pharmacokinetics of FTC and TAF (components of BIKTARVY) were evaluated in virologically-suppressed adults with ESRD (estimated creatinine clearance of less than 15 mL/min) on chronic hemodialysis treated with FTC+TAF in combination with elvitegravir and cobicistat as fixed-dose combination tablet for 96 weeks (N=55). In an extension phase of Trial 1825, 10 virologically-suppressed subjects switched to BIKTARVY and all subjects remained virologically suppressed (HIV-1 RNA 50 copies/mL) for 48 weeks.In Trial 4449, the efficacy and safety of switching from stable antiretroviral regimen to BIKTARVY (containing 50 mg of BIC, 200 mg of FTC, and 25 mg of TAF) were evaluated in an open-label, single arm trial of virologically-suppressed (HIV-1 RNA less than 50 copies per mL) HIV-1 infected adults aged 65 years and over (N=86). Subjects treated with BIKTARVY had mean age of 70 years (range: 65 to 80). The primary endpoint was the proportion of subjects with HIV RNA 50 copies/mL at Week 48. No subjects had HIV RNA 50 copies/mL. Ninety-one percent (78/86) of subjects remained suppressed (HIV-1 RNA 50 copies/mL) at Week 48. Eight subjects did not have virologic data at the Week 48 timepoint due to discontinuation or missing data.. 14.4Clinical Trial Results in Pediatric Subjects with HIV-1. In Trial 1474, an open-label, single arm trial the efficacy, safety, and pharmacokinetics of BIKTARVY in HIV-1 infected pediatric subjects were evaluated in virologically-suppressed adolescents between the ages of 12 to less than 18 years weighing at least 35 kg (N=50), in virologically-suppressed children between the ages of to less than 12 years weighing at least 25 kg (N=50), and in virologically-suppressed children at least years of age and weighing at least 14 to less than 25 kg (N=22).. Cohort 1: Virologically-suppressed adolescents (12 to less than 18 years; at least 35 kg)Subjects in cohort treated with BIKTARVY (containing 50 mg of BIC, 200 mg of FTC, and 25 mg of TAF) once daily had mean age of 14 years (range: 12 to 17) and mean baseline weight of 51.7 kg (range: 35 to 123), 64% were female, 27% were Asian and 65% were black. At baseline, median CD4+ cell count was 750 cells per mm3 (range: 337 to 1207), and median CD4+% was 33% (range: 19% to 45%).After switching to BIKTARVY, 98% (49/50) of subjects in cohort remained suppressed (HIV-1 RNA 50 copies/mL) at Week 48. The mean change from baseline in CD4+ cell count at Week 48 was -22 cells per mm3.. Cohort 2: Virologically-suppressed children (6 to less than 12 years; at least 25 kg)Subjects in cohort treated with BIKTARVY once daily had mean age of 10 years (range: to 11) and mean baseline weight of 31.9 kg (range: 25 to 69), 54% were female, 22% were Asian and 72% were black. At baseline, median CD4+ cell count was 898 cells per mm3 (range 390 to 1991) and median CD4+% was 37% (range: 19% to 53%).After switching to BIKTARVY (containing 50 mg of BIC, 200 mg of FTC, and 25 mg of TAF), 100% (50/50) of subjects in cohort remained suppressed (HIV-1 RNA 50 copies/mL) at Week 24. The mean change from baseline in CD4+ cell count at Week 24 was -24 cells per mm3.. Cohort 3: Virologically-suppressed children (at least years; at least 14 to less than 25 kg)Subjects in cohort treated with BIKTARVY (containing 30 mg of BIC, 120 mg of FTC, and 15 mg of TAF) once daily had mean age of years (range: to 9) and mean baseline weight of 18.8 kg (range: 14 to 24), 50% were female, 23% were Asian and 73% were black. At baseline, the mean CD4+ cell count (SD) was 1104 (440), and the mean CD4% (SD) was 33.4% (6.0%).After switching to BIKTARVY, 91% (20/22) of subjects in cohort remained suppressed (HIV-1 RNA 50 copies/mL) at Week 24. HIV-1 RNA was not collected at Week 24 for subjects because of COVID-19 pandemic-related study disruption. The mean change from baseline to Week 24 in CD4+ cell count (SD) was -126 (264.2) cells per mm3 and the mean change in CD4% (SD) from baseline to Week 24 was 0.2% (4.4%).

CLINICAL TRIALS EXPERIENCE SECTION.

6.1Clinical Trials Experience. Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.. Clinical Trials in Adults with No Antiretroviral Treatment HistoryThe primary safety assessment of BIKTARVY was based on Week 48 data from two randomized, double-blind, active-controlled trials, Trial 1489 and Trial 1490, that enrolled 1274 HIV-1 infected adult subjects with no antiretroviral treatment history. total of 634 subjects received one tablet of BIKTARVY once daily [see Clinical Studies (14.2)].The most common adverse reactions (all Grades) reported in at least 5% of subjects in the BIKTARVY group in either Trial 1489 or Trial 1490 were diarrhea, nausea, and headache. The proportion of subjects who discontinued treatment with BIKTARVY, abacavir [ABC]/dolutegravir [DTG]/ lamivudine [3TC]), or DTG FTC/TAF, due to adverse events, regardless of severity, was 1%, 1%, and <1%, respectively. Table displays the frequency of adverse reactions (all Grades) greater than or equal to 2% in the BIKTARVY group.Table 1Adverse ReactionsFrequencies of adverse reactions are based on all adverse events attributed to trial drugs by the investigator. No adverse reactions of Grade or higher occurred in >= 1% of subjects treated with BIKTARVY. (All Grades) Reported in >= 2% of HIV-1 Infected Adults with No Antiretroviral Treatment History Receiving BIKTARVY in Trials 1489 or 1490 (Week 48 analysis)Trial 1489Trial 1490Adverse ReactionsBIKTARVY N=314ABC/DTG/3TC N=315BIKTARVY N=320DTG FTC/TAF N=325Diarrhea6%4%3%3%Nausea5%17%3%5%Headache5%5%4%3%Fatigue3%3%2%2%Abnormal dreams3%3%<1%1%Dizziness2%3%2%1%Insomnia2%3%2%<1%Additional adverse reactions (all Grades) occurring in less than 2% of subjects administered BIKTARVY in Trials 1489 and 1490 included vomiting, flatulence, dyspepsia, abdominal pain, rash, and depression.Suicidal ideation, suicide attempt, and depression suicidal occurred in <1% of subjects administered BIKTARVY; all events were serious and primarily occurred in subjects with preexisting history of depression, prior suicide attempt or psychiatric illness.The majority (87%) of adverse events associated with BIKTARVY were Grade 1.. Clinical Trials in Virologically Suppressed AdultsThe safety of BIKTARVY in virologically-suppressed adults was based on Week 48 data from 282 subjects in randomized, double-blind, active-controlled trial (Trial 1844) in which virologically-suppressed subjects were switched from either DTG ABC/3TC or ABC/DTG/3TC to BIKTARVY; and Week 48 data from 290 subjects in an open-label, active-controlled trial in which virologically-suppressed subjects were switched from regimen containing atazanavir (ATV) (given with cobicistat or ritonavir) or darunavir (DRV) (given with cobicistat or ritonavir) plus either FTC/TDF or ABC/3TC, to BIKTARVY (Trial 1878). Overall, the safety profile in virologically-suppressed adult subjects in Trials 1844 and 1878 was similar to that in subjects with no antiretroviral treatment history [see Clinical Studies (14.3)].. Clinical Trial in Adults with End Stage Renal Disease (ESRD) Receiving Chronic HemodialysisThe safety of FTC and TAF (components of BIKTARVY) was evaluated in single arm, open-label trial (Trial 1825) in virologically-suppressed adults with ESRD (estimated creatinine clearance of less than 15 mL/min) on chronic hemodialysis treated with FTC+TAF in combination with elvitegravir and cobicistat as fixed-dose combination tablet for 96 weeks (N=55). The most commonly reported adverse reaction (adverse event assessed as causally related by investigator and all grades) was nausea (7%). Serious adverse events were reported in 65% of subjects and the most common serious adverse events were pneumonia (15%), fluid overload (7%), hyperkalemia (11%) and osteomyelitis (7%). Overall 7% of subjects permanently discontinued treatment due to an adverse event. In an extension phase of Trial 1825 in which 10 subjects switched to BIKTARVY for 48 weeks, the safety findings were similar to those in the initial phase of the open-label trial [see Use in Specific Populations (8.6), Clinical Studies (14.3)].. Laboratory AbnormalitiesThe frequency of laboratory abnormalities (Grades 3-4) occurring in at least 2% of subjects receiving BIKTARVY in Trials 1489 and 1490 are presented in Table 2.Table 2Laboratory Abnormalities (Grades 3-4) Reported in >= 2% of Subjects Receiving BIKTARVY in Trials 1489 or 1490 (Week 48 analysis)Trial 1489Trial 1490Laboratory Parameter AbnormalityFrequencies are based on treatment-emergent laboratory abnormalities. BIKTARVY N=314ABC/DTG/3TC N=315BIKTARVY N=320DTG FTC/TAF N=325ULN Upper limit of normalAmylase (>2.0 ULN)2%2%2%2%ALT (>5.0 ULN)1%1%2%1%AST (>5.0 ULN)2%1%1%3%Creatine Kinase (>=10.0 ULN)4%3%4%2%Neutrophils (<750 mm3)2%3%2%1%LDL-cholesterol (fasted) (>190 mg/dL)2%3%3%3%. Changes in Serum Creatinine: BIC has been shown to increase serum creatinine due to inhibition of tubular secretion of creatinine without affecting renal glomerular function [see Clinical Pharmacology (12.2)]. Increases in serum creatinine occurred by Week of treatment and remained stable through Week 48. In Trials 1489 and 1490, median (Q1, Q3) serum creatinine increased by 0.10 (0.03, 0.17) mg per dL from baseline to Week 48 in the BIKTARVY group and was similar to the comparator groups who received ABC/DTG/3TC, or DTG FTC/TAF. There were no discontinuations due to renal adverse events and renal serious adverse events were encountered in less than 1% of participants treated with BIKTARVY through Week 48 in clinical trials.. Changes in Bilirubin: In Trials 1489 and 1490, total bilirubin increases were observed in 12% of subjects administered BIKTARVY through Week 48. Increases were primarily Grade (1.0 to 1.5 ULN) (9%) and Grade (1.5 to 2.5 ULN) (3%). Graded bilirubin increases in the ABC/DTG/3TC, and DTG FTC/TAF groups, were 4% and 6%, respectively. Increases were primarily Grade (3% ABC/DTG/3TC and 5% DTG FTC/TAF) or Grade (1% ABC/DTG/3TC and 1% DTG FTC/TAF). There were no discontinuations due to hepatic adverse events through Week 48 in BIKTARVY clinical studies.. Clinical Trials in Pediatric SubjectsThe safety of BIKTARVY was evaluated in HIV-1 infected virologically-suppressed subjects between the ages of 12 to less than 18 years and weighing at least 35 kg (N=50) through Week 48 (cohort 1), in virologically-suppressed subjects between the ages of to less than 12 years and weighing at least 25 kg (N=50) through Week 24 (cohort 2), and in virologically suppressed subjects at least years of age and weighing at least 14 to less than 25 kg (N=22) through Week 24 (cohort 3) in an open label clinical trial (Trial 1474) [see Clinical Studies (14.4)]. No new adverse reactions or laboratory abnormalities were identified compared to those observed in adults. Adverse reactions were reported in 11% of pediatric subjects. The majority (76%) of adverse reactions were Grade 1. No Grade or adverse reactions were reported. The adverse reaction reported by more than one subject (regardless of severity) was abdominal discomfort (n=2). One subject (1%) had Grade adverse reactions of insomnia and anxiety that led to discontinuation of BIKTARVY. The other adverse reactions that occurred in single subjects were similar to those seen in adults.

DOSAGE & ADMINISTRATION SECTION.

2DOSAGE AND ADMINISTRATION. Testing: Prior to or when initiating BIKTARVY test for hepatitis virus infection. Prior to or when initiating BIKTARVY, and during treatment, assess serum creatinine, estimated creatinine clearance, urine glucose, and urine protein in all patients as clinically appropriate. In patients with chronic kidney disease, also assess serum phosphorus. (2.1)Recommended dosage in adults and pediatric patients weighing at least 25 kg: One tablet containing 50 mg BIC, 200 mg FTC, and 25 mg TAF taken once daily with or without food. (2.2)Recommended dosage in pediatric patients weighing at least 14 kg to less than 25 kg: One tablet containing 30 mg BIC, 120 mg FTC, and 15 mg TAF taken once daily with or without food. (2.3)Renal impairment: BIKTARVY is not recommended in patients with estimated creatinine clearance of 15 to below 30 mL/min, or below 15 mL/min who are not receiving chronic hemodialysis, or below 15 mL/min who have no antiretroviral treatment history. (2.4)Hepatic impairment: BIKTARVY is not recommended in patients with severe hepatic impairment. (2.5). Testing: Prior to or when initiating BIKTARVY test for hepatitis virus infection. Prior to or when initiating BIKTARVY, and during treatment, assess serum creatinine, estimated creatinine clearance, urine glucose, and urine protein in all patients as clinically appropriate. In patients with chronic kidney disease, also assess serum phosphorus. (2.1). Recommended dosage in adults and pediatric patients weighing at least 25 kg: One tablet containing 50 mg BIC, 200 mg FTC, and 25 mg TAF taken once daily with or without food. (2.2). Recommended dosage in pediatric patients weighing at least 14 kg to less than 25 kg: One tablet containing 30 mg BIC, 120 mg FTC, and 15 mg TAF taken once daily with or without food. (2.3). Renal impairment: BIKTARVY is not recommended in patients with estimated creatinine clearance of 15 to below 30 mL/min, or below 15 mL/min who are not receiving chronic hemodialysis, or below 15 mL/min who have no antiretroviral treatment history. (2.4). Hepatic impairment: BIKTARVY is not recommended in patients with severe hepatic impairment. (2.5). 2.1Testing When Initiating and During Treatment with BIKTARVY. Prior to or when initiating BIKTARVY, test patients for hepatitis virus infection [see Warnings and Precautions (5.1)].Prior to or when initiating BIKTARVY, and during treatment with BIKTARVY, assess serum creatinine, estimated creatinine clearance, urine glucose and urine protein in all patients as clinically appropriate. In patients with chronic kidney disease, also assess serum phosphorus [see Warnings and Precautions (5.4)]. 2.2Recommended Dosage in Adults and Pediatric Patients Weighing at Least 25 kg. BIKTARVY is three-drug fixed dose combination product containing bictegravir (BIC), emtricitabine (FTC), and tenofovir alafenamide (TAF). The recommended dosage of BIKTARVY is one tablet containing 50 mg of BIC, 200 mg of FTC, and 25 mg of TAF taken orally once daily with or without food in:adults and pediatric patients weighing at least 25 kg with an estimated creatinine clearance greater than or equal to 30 mL/min; orvirologically-suppressed adults with an estimated creatinine clearance below 15 mL/min who are receiving chronic hemodialysis. On days of hemodialysis, administer the daily dose of BIKTARVY after completion of hemodialysis treatment [see Use in Specific Populations (8.4, 8.6) and Clinical Pharmacology (12.3)].. adults and pediatric patients weighing at least 25 kg with an estimated creatinine clearance greater than or equal to 30 mL/min; or. virologically-suppressed adults with an estimated creatinine clearance below 15 mL/min who are receiving chronic hemodialysis. On days of hemodialysis, administer the daily dose of BIKTARVY after completion of hemodialysis treatment [see Use in Specific Populations (8.4, 8.6) and Clinical Pharmacology (12.3)].. 2.3Recommended Dosage in Pediatric Patients Weighing at Least 14 kg to Less than 25 kg. The recommended dosage of BIKTARVY is one tablet containing 30 mg of BIC, 120 mg of FTC, and 15 mg of TAF taken orally once daily with or without food in: pediatric patients weighing at least 14 kg to less than 25 kg with an estimated creatinine clearance greater than or equal to 30 mL/min [see Use in Specific Populations (8.4, 8.6) and Clinical Pharmacology (12.3)].For children unable to swallow whole tablet, the tablet can be split and each part taken separately as long as all parts are ingested within approximately 10 minutes.. pediatric patients weighing at least 14 kg to less than 25 kg with an estimated creatinine clearance greater than or equal to 30 mL/min [see Use in Specific Populations (8.4, 8.6) and Clinical Pharmacology (12.3)].. 2.4Not Recommended in Patients with Severe Renal Impairment. BIKTARVY is not recommended in patients with [see Dosage and Administration (2.2, 2.3) and Use in Specific Populations (8.6)].:severe renal impairment (estimated creatinine clearance of 15 to below 30 mL/min); orend stage renal disease (ESRD; estimated creatinine clearance below 15 mL/min who are not receiving chronic hemodialysis; orno antiretroviral treatment history and ESRD who are receiving chronic hemodialysis.. severe renal impairment (estimated creatinine clearance of 15 to below 30 mL/min); or. end stage renal disease (ESRD; estimated creatinine clearance below 15 mL/min who are not receiving chronic hemodialysis; or. no antiretroviral treatment history and ESRD who are receiving chronic hemodialysis.. 2.5Not Recommended in Patients with Severe Hepatic Impairment. BIKTARVY is not recommended in patients with severe hepatic impairment (Child-Pugh Class C) [see Use in Specific Populations (8.7) and Clinical Pharmacology (12.3)].

DRUG INTERACTIONS SECTION.

7DRUG INTERACTIONS. Because BIKTARVY is complete regimen, coadministration with other antiretroviral medications for the treatment of HIV-1 infection is not recommended. (7.1)Consult the Full Prescribing Information prior to and during treatment for important drug interactions. (4, 5.2, 7, 12.3). Because BIKTARVY is complete regimen, coadministration with other antiretroviral medications for the treatment of HIV-1 infection is not recommended. (7.1). Consult the Full Prescribing Information prior to and during treatment for important drug interactions. (4, 5.2, 7, 12.3). 7.1Other Antiretroviral Medications. Because BIKTARVY is complete regimen, coadministration with other antiretroviral medications for the treatment of HIV-1 infection is not recommended [see Indications and Usage (1)]. Comprehensive information regarding potential drug-drug interactions with other antiretroviral medications is not provided because the safety and efficacy of concomitant HIV-1 antiretroviral therapy is unknown.. 7.2Potential for BIKTARVY to Affect Other Drugs. BIC inhibits organic cation transporter (OCT2) and multidrug and toxin extrusion transporter (MATE1) in vitro. Coadministration of BIKTARVY with drugs that are substrates of OCT2 and MATE1 (e.g., dofetilide) may increase their plasma concentrations (see Table 3).. 7.3Potential Effect of Other Drugs on One or More Components of BIKTARVY. BIC is substrate of CYP3A and UGT1A1. drug that is strong inducer of CYP3A and also an inducer of UGT1A1 can substantially decrease the plasma concentrations of BIC which may lead to loss of therapeutic effect of BIKTARVY and development of resistance [see Clinical Pharmacology (12.3)].The use of BIKTARVY with drug that is strong inhibitor of CYP3A and also an inhibitor of UGT1A1 may significantly increase the plasma concentrations of BIC.TAF is substrate of P-glycoprotein (P-gp) and breast cancer resistance protein (BCRP). Co-administration of drugs that inhibit P-gp and BCRP may increase the absorption and plasma concentrations of TAF [see Clinical Pharmacology (12.3)]. Co-administration of drugs that induce P-gp activity are expected to decrease the absorption of TAF, resulting in decreased plasma concentration of TAF, which may lead to loss of therapeutic effect of BIKTARVY and development of resistance (see Table 3).. 7.4Drugs Affecting Renal Function. Because FTC and tenofovir are primarily excreted by the kidneys by combination of glomerular filtration and active tubular secretion, coadministration of BIKTARVY with drugs that reduce renal function or compete for active tubular secretion may increase concentrations of FTC, tenofovir, and other renally eliminated drugs and this may increase the risk of adverse reactions. Some examples of drugs that are eliminated by active tubular secretion include, but are not limited to, acyclovir, cidofovir, ganciclovir, valacyclovir, valganciclovir, aminoglycosides (e.g., gentamicin), and high-dose or multiple NSAIDs [see Warnings and Precautions (5.4)].. 7.5Established and Potentially Significant Drug Interactions. Table provides listing of established or potentially clinically significant drug interactions with recommended prevention or management strategies. The drug interactions described are based on studies conducted with either BIKTARVY, the components of BIKTARVY (BIC, FTC, and TAF) as individual agents, or are drug interactions that may occur with BIKTARVY [see Contraindications (4), Warnings and Precautions (5.2), and Clinical Pharmacology (12.3)].Table 3Established and Potentially SignificantTable is not all inclusive. Drug Interactions: Alteration in Regimen May be RecommendedConcomitant Drug Class: Drug NameEffect on Concentration Increase, Decrease. Clinical CommentAntiarrhythmics: dofetilide DofetilideCoadministration is contraindicated due to the potential for serious and/or life-threatening events associated with dofetilide therapy [see Contraindications (4)].Anticonvulsants: carbamazepineDrug-drug interaction study was conducted with either BIKTARVY or its components as individual agents. oxcarbazepinephenobarbitalphenytoin BIC TAFCoadministration with alternative anticonvulsants should be considered.Antimycobacterials:rifabutinrifampin,Strong inducer of CYP3Aand P-gp, and inducer of UGT1A1.rifapentine BIC TAFCoadministration with rifampin is contraindicated due to the effect of rifampin on the BIC component of BIKTARVY [see Contraindications (4)]. Coadministration with rifabutin or rifapentine is not recommended.Herbal Products: St. Johns wortThe induction potency of St. Johns wort may vary widely based on preparation. BIC TAFCoadministration with St. Johns wort is not recommended.Medications or oral supplements containing polyvalent cations (e.g., Mg, Al, Ca, Fe):Calcium or iron supplementsCation-containing antacids or laxativesSucralfateBuffered medications BICAntacids containing Al/Mg: BIKTARVY can be taken at least hours before or hours after taking antacids containing Al/Mg. Routine administration of BIKTARVY together with, or hours after, antacids containing Al/Mg is not recommended. Supplements or Antacids containing Calcium or Iron: BIKTARVY and supplements or antacids containing calcium or iron can be taken together with food. Routine administration of BIKTARVY under fasting conditions together with, or hours after, supplements or antacids containing calcium or iron is not recommended.Metformin MetforminRefer to the prescribing information of metformin for assessing the benefit and risk of concomitant use of BIKTARVY and metformin.. 7.6Drugs without Clinically Significant Interactions with BIKTARVY. Based on drug interaction studies conducted with BIKTARVY or the components of BIKTARVY, no clinically significant drug interactions have been observed when BIKTARVY is combined with the following drugs: ethinyl estradiol, ledipasvir/sofosbuvir, midazolam, norgestimate, sertraline, sofosbuvir, sofosbuvir/velpatasvir, and sofosbuvir/velpatasvir/voxilaprevir.

PREGNANCY SECTION.

8.1Pregnancy. Pregnancy Exposure RegistryThere is pregnancy exposure registry that monitors pregnancy outcomes in women exposed to BIKTARVY during pregnancy. Healthcare providers are encouraged to register patients by calling the Antiretroviral Pregnancy Registry (APR) at 1-800-258-4263.. Risk SummaryThere are insufficient human data on the use of BIKTARVY during pregnancy to inform drug-associated risk of birth defects and miscarriage. Dolutegravir, another integrase inhibitor, has been associated with neural tube defects (NTDs) (see Data). Discuss the benefit-risk of using BIKTARVY with individuals of childbearing potential, particularly if pregnancy is being planned. BIKTARVY use during pregnancy has been evaluated in limited number of women reported to the APR; consequently, there are insufficient BIC data from the APR to adequately assess the risk of major birth defects. Reports of pregnant individuals treated with other drug products containing TAF or FTC contribute to APRs overall risk assessment for these components. Available data from the APR show no statistically significant difference in the overall risk of major birth defects for FTC or TAF compared with the background rate for major birth defects of 2.7% in U.S. reference population of the Metropolitan Atlanta Congenital Defects Program (MACDP) (see Data). The rate of miscarriage is not reported in the APR. The estimated background rate of miscarriage in the clinically recognized pregnancies in the U.S. general population is 15-20%.In animal reproduction studies, no evidence of adverse developmental outcomes was observed with the components of BIKTARVY at exposures that were either not maternally toxic (rabbits) or greater than (rats and mice) those in humans at the recommended human dose (RHD) (see Data ). During organogenesis, systemic exposures (AUC) to BIC were approximately 36 (rats) and 0.6 times (rabbits), to FTC were approximately 60 (mice) and 108 times (rabbits), and to TAF were approximately (rats) and 78 times (rabbits) the exposure at the RHD of BIKTARVY. In rat pre/postnatal development studies, maternal systemic exposures (AUC) were 30 times (BIC), 60 times (FTC), and 19 times (TDF) the exposures of each component in humans at the RHD.. Data. Human DataProspective reports from the APR of overall major birth defects in pregnancies exposed to the components of BIKTARVY are compared with U.S. background major birth defect rate. Methodological limitations of the APR include the use of MACDP as the external comparator group. The MACDP population is not disease-specific, evaluates women and infants from limited geographic area, and does not include outcomes for births that occurred at less than 20 weeks gestation.. Bictegravir (BIC):Data from an observational study in Botswana showed that dolutegravir, another integrase inhibitor, was associated with increased risk of neural tube defects when administered at the time of conception and in early pregnancy. Data available to date from other sources including the APR, clinical trials, and postmarketing data are insufficient to address this risk with BIC.There are an insufficient number of reports to the APR to adequately assess the risk of major birth defects associated with BIC exposure. The APR has received prospective reports of birth defects among 100 (3.0%) first trimester exposures to BIC-containing regimens during pregnancy resulting in live births. No birth defects were reported among 40 exposures during the second/third trimester.. Emtricitabine (FTC):Based on prospective reports to the APR of over 5,400 exposures to FTC-containing regimens during pregnancy resulting in live births (including over 3,900 exposed in the first trimester and over 1,500 exposed in the second/third trimester), the prevalence of birth defects in live births was 2.6% (95% CI: 2.2% to 3.2%) and 2.7% (95% CI: 1.9% to 3.7%) following first and second/third trimester exposure, respectively, to FTC-containing regimens.. Tenofovir Alafenamide (TAF):Based on prospective reports to the APR of over 660 exposures to TAF-containing regimens during pregnancy resulting in live births (including over 520 exposed in the first trimester and over 130 exposed in the second/third trimester), the prevalence of birth defects in live births was 4.2% (95% CI: 2.6% to 6.3%) and 3.0% (95% CI: 0.8% to 7.5%) following first and second/third trimester exposure, respectively, to TAF-containing regimens.. Animal Data. Bictegravir: BIC was administered orally to pregnant rats (5, 30, or 300 mg/kg/day) and rabbits (100, 300, or 1000 mg/kg/day) on gestation days through 17, and through 19, respectively. No adverse embryo-fetal effects were observed in rats and rabbits at BIC exposures (AUC) of up to approximately 36 (rats) and 0.6 (rabbits) times the exposure in humans at the RHD of BIKTARVY. Spontaneous abortion, increased clinical signs [fecal changes, thin body, and cold-to-touch], and decreased body weight were observed at maternally toxic dose in rabbits (1000 mg/kg/day; approximately 1.4 times higher than human exposure at the RHD).In pre/postnatal development study, BIC was administered orally to pregnant rats (up to 300 mg/kg/day) from gestation days to lactation/post-partum day 24. No significant adverse effects were observed in the offspring exposed daily from before birth (in utero) through lactation at maternal and pup exposures (AUC) of approximately 30 and 11 times higher, respectively, than human exposures at the RHD.. Emtricitabine: FTC was administered orally to pregnant mice (250, 500, or 1000 mg/kg/day) and rabbits (100, 300, or 1000 mg/kg/day) through organogenesis (on gestation days through 15, and through 19, respectively). No significant toxicological effects were observed in embryo-fetal toxicity studies performed with emtricitabine in mice at exposures approximately 60 times higher and in rabbits at approximately 108 times higher than human exposures at the RHD.In pre/postnatal development study with FTC, mice were administered doses up to 1000 mg/kg/day; no significant adverse effects directly related to drug were observed in the offspring exposed daily from before birth (in utero) through sexual maturity at daily exposures (AUC) of approximately 60 times higher than human exposures at the RHD.. Tenofovir alafenamide: TAF was administered orally to pregnant rats (25, 100, or 250 mg/kg/day) and rabbits (10, 30, or 100 mg/kg/day) through organogenesis (on gestation days through 17, and through 20, respectively). No adverse embryo-fetal effects were observed in rats and rabbits at TAF exposures of approximately (rats) and 78 (rabbits) times higher than the exposure in humans at the recommended daily dose of BIKTARVY. TAF is rapidly converted to tenofovir; the observed tenofovir exposure in rats and rabbits were 55 (rats) and 86 (rabbits) times higher than human tenofovir exposures at the RHD. Since TAF is rapidly converted to tenofovir and lower tenofovir exposures in rats and mice were observed after TAF administration compared to TDF administration, pre/postnatal development study in rats was conducted only with TDF. Doses up to 600 mg/kg/day were administered through lactation; no adverse effects were observed in the offspring on gestation day [and lactation day 20] at tenofovir exposures of approximately 12 [19] times higher than the exposures in humans at the RHD of BIKTARVY.

MICROBIOLOGY SECTION.

12.4Microbiology. Mechanism of Action. Bictegravir: BIC inhibits the strand transfer activity of HIV-1 integrase (integrase strand transfer inhibitor; INSTI), an HIV-1 encoded enzyme that is required for viral replication. Inhibition of integrase prevents the integration of linear HIV-1 DNA into host genomic DNA, blocking the formation of the HIV-1 provirus and propagation of the virus.. Emtricitabine: FTC, synthetic nucleoside analog of cytidine, is phosphorylated by cellular enzymes to form emtricitabine 5-triphosphate. Emtricitabine 5-triphosphate inhibits the activity of the HIV-1 reverse transcriptase by competing with the natural substrate deoxycytidine 5-triphosphate and by being incorporated into nascent viral DNA which results in chain termination. Emtricitabine 5-triphosphate is weak inhibitor of mammalian DNA polymerases , E, and mitochondrial DNA polymerase .. Tenofovir Alafenamide: TAF is phosphonamidate prodrug of tenofovir (2-deoxyadenosine monophosphate analog). Plasma exposure to TAF allows for permeation into cells and then TAF is intracellularly converted to tenofovir through hydrolysis by cathepsin A. Tenofovir is subsequently phosphorylated by cellular kinases to the active metabolite tenofovir diphosphate. Tenofovir diphosphate inhibits HIV-1 replication through incorporation into viral DNA by the HIV reverse transcriptase, which results in DNA chain-termination. Tenofovir diphosphate is weak inhibitor of mammalian DNA polymerases that include mitochondrial DNA polymerase and there is no evidence of toxicity to mitochondria in cell culture.. Antiviral Activity in Cell CultureThe triple combination of BIC, FTC, and TAF was not antagonistic with respect to antiviral activity in cell culture.. Bictegravir: The antiviral activity of BIC against laboratory and clinical isolates of HIV-1 was assessed in lymphoblastoid cell lines, PBMCs, primary monocyte/macrophage cells, and CD4+ T-lymphocytes. In MT-4 cells (human lymphoblastoid T-cell line) acutely infected with HIV-1 IIIB, the mean 50% effective concentration (EC50) was 2.4+-0.4 nM, and the protein-adjusted EC95 value was 361 nM (0.162 micrograms per mL). BIC displayed antiviral activity in activated PBMCs against clinical isolates of HIV-1 representing groups M, N, and O, including subtypes A, B, C, D, E, F, and G, with median EC50 value of 0.55 nM (range <0.05 to 1.71 nM). The EC50 value against single HIV-2 isolate was 1.1 nM.. Emtricitabine: The antiviral activity of FTC against laboratory and clinical isolates of HIV-1 was assessed in lymphoblastoid cell lines, the MAGI-CCR5 cell line, and PBMCs. In PBMCs acutely infected with HIV-1 subtypes A, B, C, D, E, F, and G, the median EC50 value for FTC was 9.5 nM (range to 30 nM) and against HIV-2 was nM.. Tenofovir Alafenamide: The antiviral activity of TAF against laboratory and clinical isolates of HIV-1 subtype was assessed in lymphoblastoid cell lines, PBMCs, primary monocyte/macrophage cells and CD4-T lymphocytes. The EC50 values for TAF ranged from 2.0 to 14.7 nM. TAF displayed antiviral activity in cell culture against all HIV-1 groups (M, N, O), including subtypes A, B, C, D, E, F, and (EC50 values ranged from 0.1 to 12 nM) and strain specific activity against HIV-2 (EC50 values ranged from 0.9 to 2.6 nM).. Resistance. In Cell Culture. Bictegravir: HIV-1 isolates with reduced susceptibility to BIC have been selected in cell culture. In one selection with BIC, virus pool emerged expressing amino acid substitutions M50I and R263K in the HIV-1 integrase. M50I, R263K, and M50I+R263K substitutions, when introduced into wild-type virus by site-directed mutagenesis, conferred 1.3-, 2.2-, and 2.9-fold reduced susceptibility to BIC, respectively. In second selection, emergence of amino acid substitutions T66I and S153F was detected, and 0.4-, 1.9-, and 0.5-fold reductions in BIC susceptibility were observed with T66I, S153F, and T66I+S153F, respectively. In addition, S24G and E157K substitutions emerged during the selection process.. Emtricitabine: HIV-1 isolates with reduced susceptibility to FTC were selected in cell culture and in subjects treated with FTC. Reduced susceptibility to FTC was associated with M184V or substitutions in HIV-1 RT.. Tenofovir Alafenamide: HIV-1 isolates with reduced susceptibility to TAF were selected in cell culture. HIV-1 isolates selected by TAF expressed K65R substitution in HIV-1 RT, sometimes in the presence of S68N or L429I substitutions; in addition, K70E substitution in HIV-1 RT was observed.. In Clinical Trials. In Subjects with No Antiretroviral Treatment History: Pooled genotypic resistance analyses were performed on paired baseline and on-treatment HIV-1 isolates from subjects receiving BIKTARVY through Week 48 in Trials 1489 and 1490 [see Clinical Studies (14.2)] who had HIV-1 RNA greater than or equal to 200 copies/mL at the time of confirmed virologic failure, Week 48, or early study drug discontinuation. No specific amino acid substitutions emerged consistently in the treatment failure subjects with evaluable genotypic resistance data and failed to establish an association with genotypic BIC resistance. There were no treatment-emergent NRTI resistance-associated substitutions detected in the evaluated treatment failure isolates. Phenotypic resistance analyses of failure isolates found fold-changes in drug susceptibility below the biological or clinical cutoffs for BIC, FTC, and TFV, compared to wild-type reference HIV-1.. In Virologically Suppressed Adult Subjects: In switch trials, Trials 1844 and 1878 [see Clinical Studies (14.3)], of virologically suppressed HIV-1 infected subjects (n=572), only one subject with virologic rebound in the resistance analysis population had IN genotypic and phenotypic data, and rebounders had RT genotypic and phenotypic data. No subjects had HIV-1 with treatment-emergent genotypic or phenotypic resistance to BIC, FTC, or TAF.. In Virologically Suppressed Pediatric Subjects: In Trial 1474 [see Clinical Studies (14.4)], two of 50 subjects in cohort were evaluated for the development of resistance through Week 48; no amino acid substitutions known to be associated with resistance to BIC, FTC, or TFV were detected. No subjects in cohort or met the criteria for resistance analyses through Week 24.. Cross-Resistance. Bictegravir: Cross-resistance has been observed among INSTIs. The susceptibility of BIC was tested against 64 clinical isolates expressing known INSTI resistance-associated substitutions listed by IAS-USA (20 with single substitutions and 44 with or more substitutions). Isolates with single INSTI-resistance substitution including E92Q, T97A, Y143C/R, Q148R, and N155H showed less than 2-fold reduced susceptibility to BIC. All isolates (n=14) with more than 2.5-fold reduced susceptibility to BIC (above the biological cutoff for BIC) contained G140A/C/S and Q148H/R/K substitutions; the majority (64.3%, 9/14) had complex INSTI resistance pattern with an additional INSTI-resistance substitution L74M, T97A, or E138A/K. Of those evaluated isolates containing G140A/C/S and Q148H/R/K substitutions in the absence of additional INSTI-resistance substitutions, 38.5% (5/13) showed more than 2.5-fold reduction. In addition, site-directed mutant viruses with G118R (dolutegravir and raltegravir treatment-emergent substitution) and G118R+T97A had 3.4- and 2.8-fold reduced susceptibility to BIC, respectively.BIC demonstrated equivalent antiviral activity with less than 2-fold reductions in susceptibility against HIV-1 variants expressing substitutions associated with resistance to NNRTIs, NRTIs, and PIs, compared with the wild-type virus.. Emtricitabine: Cross-resistance has been observed among NRTIs. FTC-resistant viruses with an M184V/I substitution in HIV-1 RT were cross-resistant to lamivudine. HIV-1 isolates containing the K65R RT substitution, selected in vivo by abacavir, didanosine, and tenofovir, demonstrated reduced susceptibility to inhibition by FTC.. Tenofovir Alafenamide: Cross-resistance has been observed among NRTIs. Tenofovir resistance substitutions K65R and K70E result in reduced susceptibility to abacavir, didanosine, emtricitabine, lamivudine, and tenofovir. HIV-1 with multiple thymidine analog substitutions (M41L, D67N, K70R, L210W, T215F/Y, K219Q/E/N/R), or multinucleoside resistant HIV-1 with T69S double insertion mutation or with Q151M substitution complex including K65R, showed reduced susceptibility to TAF in cell culture.

SPL PATIENT PACKAGE INSERT SECTION.

Patient InformationBIKTARVY(R) (bik-TAR-vee) (bictegravir, emtricitabine, and tenofovir alafenamide) tabletsThis Patient Information has been approved by the U.S. Food and Drug Administration.Revised:10/2021 Important: Ask your healthcare provider or pharmacist about medicines that should not be taken with BIKTARVY. For more information, see What should tell my healthcare provider before taking BIKTARVYWhat is the most important information should know about BIKTARVYBIKTARVY can cause serious side effects, including:Worsening of hepatitis virus (HBV) infection. Your healthcare provider will test you for HBV infection before or when you start treatment with BIKTARVY. If you have HBV infection and take BIKTARVY, your HBV may get worse (flare-up) if you stop taking BIKTARVY. flare-up is when your HBV infection suddenly returns in worse way than before.Do not run out of BIKTARVY. Refill your prescription or talk to your healthcare provider before your BIKTARVY is all gone.Do not stop taking BIKTARVY without first talking to your healthcare provider.If you stop taking BIKTARVY, your healthcare provider will need to check your health often and do blood tests regularly for several months to check your liver, and may give you medicine to treat hepatitis B. Tell your healthcare provider about any new or unusual symptoms you may have after you stop taking BIKTARVY.For more information about side effects, see What are the possible side effects of BIKTARVYWhat is BIKTARVY BIKTARVY is prescription medicine that is used without other human immunodeficiency virus-1 (HIV-1) medicines to treat HIV-1 infection in adults and children who weigh at least 31 pounds (14 kg):who have not received HIV-1 medicines in the past, or to replace their current HIV-1 medicines for people whose healthcare provider determines that they meet certain requirements.HIV-1 is the virus that causes Acquired Immune Deficiency Syndrome (AIDS). BIKTARVY contains the medicines bictegravir, emtricitabine, and tenofovir alafenamide. It is not known if BIKTARVY is safe and effective in children who weigh less than 31 pounds (14 kg).Do not take BIKTARVY if you also take medicine that contains:dofetiliderifampinWhat should tell my healthcare provider before taking BIKTARVY Before taking BIKTARVY, tell your healthcare provider about all your medical conditions, including if you:have liver problems, including HBV infectionhave kidney problemsare pregnant or plan to become pregnant. It is not known if BIKTARVY can harm your unborn baby. Tell your healthcare provider if you become pregnant during treatment with BIKTARVY. Pregnancy Registry: There is pregnancy registry for women who take BIKTARVY during pregnancy. The purpose of this registry is to collect information about the health of you and your baby. Talk with your healthcare provider about how you can take part in this registry.are breastfeeding or plan to breastfeed. Do not breastfeed if you take BIKTARVY.You should not breastfeed if you have HIV-1 because of the risk of passing HIV-1 to your baby.At least one of the medicines in BIKTARVY can pass to your baby in your breast milk. It is not known if the other medicines in BIKTARVY can pass into your breast milk.Talk with your healthcare provider about the best way to feed your baby.Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, antacids, laxatives, vitamins, and herbal supplements. Some medicines may interact with BIKTARVY. Keep list of your medicines and show it to your healthcare provider and pharmacist when you get new medicine.You can ask your healthcare provider or pharmacist for list of medicines that interact with BIKTARVY.Do not start new medicine without telling your healthcare provider. Your healthcare provider can tell you if it is safe to take BIKTARVY with other medicines. How should take BIKTARVYTake BIKTARVY exactly as your healthcare provider tells you to take it. BIKTARVY is taken by itself (not with other HIV-1 medicines) to treat HIV-1 infection.Take BIKTARVY time each day with or without food.For children unable to swallow whole tablet, the tablet can be split and each part taken separately as long as all parts are swallowed within about 10 minutes.If you are on dialysis, take your daily dose of BIKTARVY following dialysis.Do not change your dose or stop taking BIKTARVY without first talking with your healthcare provider. Stay under healthcare providers care during treatment with BIKTARVY.If you take antacids that contain aluminum or magnesium, take BIKTARVY at least hours before or hours after you take these antacids.If you take supplements or antacids that contain iron or calcium, take BIKTARVY with food at the same time that you take these supplements or antacids.Do not miss dose of BIKTARVY.If you take too much BIKTARVY, call your healthcare provider or go to the nearest hospital emergency room right away.When your BIKTARVY supply starts to run low, get more from your healthcare provider or pharmacy. This is very important because the amount of virus in your blood may increase if the medicine is stopped for even short time. The virus may develop resistance to BIKTARVY and become harder to treat.What are the possible side effects of BIKTARVYBIKTARVY may cause serious side effects, including:See What is the most important information should know about BIKTARVYChanges in your immune system (Immune Reconstitution Syndrome) can happen when you start taking HIV-1 medicines. Your immune system may get stronger and begin to fight infections that have been hidden in your body for long time. Tell your healthcare provider right away if you start having any new symptoms after starting your HIV-1 medicine.New or worse kidney problems, including kidney failure. Your healthcare provider should do blood and urine tests to check your kidneys when starting and during treatment with BIKTARVY. Your healthcare provider may tell you to stop taking BIKTARVY if you develop new or worse kidney problems.Too much lactic acid in your blood (lactic acidosis). Too much lactic acid is serious but rare medical emergency that can lead to death. Tell your healthcare provider right away if you get these symptoms: weakness or being more tired than usual, unusual muscle pain, being short of breath or fast breathing, stomach pain with nausea and vomiting, cold or blue hands and feet, feel dizzy or lightheaded, or fast or abnormal heartbeat.Severe liver problems. In rare cases, severe liver problems can happen that can lead to death. Tell your healthcare provider right away if you get these symptoms: skin or the white part of your eyes turns yellow, dark tea-colored urine, light-colored stools, loss of appetite for several days or longer, nausea, or stomach-area pain.The most common side effects of BIKTARVY are diarrhea, nausea, and headache.These are not all of the possible side effects of BIKTARVY.Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.How should store BIKTARVYStore BIKTARVY bottle below 86 (30 C).Keep the bottle tightly closed.Store BIKTARVY blister pack at room temperature between 68 to 77 (20 to 25 C).Keep BIKTARVY in its original bottle or blister pack.BIKTARVY comes in child-resistant package.Keep BIKTARVY and all medicines out of reach of children.General information about the safe and effective use of BIKTARVY.Medicines are sometimes prescribed for purposes other than those listed in Patient Information leaflet. Do not use BIKTARVY for condition for which it was not prescribed. Do not give BIKTARVY to other people, even if they have the same symptoms you have. It may harm them. If you would like more information, talk with your healthcare provider. You can ask your healthcare provider or pharmacist for information about BIKTARVY that is written for health professionals.What are the ingredients in BIKTARVYActive ingredients: bictegravir, emtricitabine, and tenofovir alafenamide.Inactive ingredients: croscarmellose sodium, magnesium stearate, and microcrystalline cellulose.The tablets are film-coated with coating material containing iron oxide black, iron oxide red, polyethylene glycol, polyvinyl alcohol, talc, and titanium dioxide.Manufactured and distributed by: Gilead Sciences, Inc. Foster City, CA 94404BIKTARVY is trademark of Gilead Sciences, Inc., or its related companies. All other trademarks referenced herein are the property of their respective owners.(C) 2021 Gilead Sciences, Inc. All rights reserved. 210251-GS-009For more information, call 1-800-445-3235 or go to www.BIKTARVY.com.. Worsening of hepatitis virus (HBV) infection. Your healthcare provider will test you for HBV infection before or when you start treatment with BIKTARVY. If you have HBV infection and take BIKTARVY, your HBV may get worse (flare-up) if you stop taking BIKTARVY. flare-up is when your HBV infection suddenly returns in worse way than before.Do not run out of BIKTARVY. Refill your prescription or talk to your healthcare provider before your BIKTARVY is all gone.Do not stop taking BIKTARVY without first talking to your healthcare provider.If you stop taking BIKTARVY, your healthcare provider will need to check your health often and do blood tests regularly for several months to check your liver, and may give you medicine to treat hepatitis B. Tell your healthcare provider about any new or unusual symptoms you may have after you stop taking BIKTARVY.. Do not run out of BIKTARVY. Refill your prescription or talk to your healthcare provider before your BIKTARVY is all gone.. Do not stop taking BIKTARVY without first talking to your healthcare provider.. If you stop taking BIKTARVY, your healthcare provider will need to check your health often and do blood tests regularly for several months to check your liver, and may give you medicine to treat hepatitis B. Tell your healthcare provider about any new or unusual symptoms you may have after you stop taking BIKTARVY.. who have not received HIV-1 medicines in the past, or to replace their current HIV-1 medicines for people whose healthcare provider determines that they meet certain requirements.. dofetilide. rifampin. have liver problems, including HBV infection. have kidney problems. are pregnant or plan to become pregnant. It is not known if BIKTARVY can harm your unborn baby. Tell your healthcare provider if you become pregnant during treatment with BIKTARVY. Pregnancy Registry: There is pregnancy registry for women who take BIKTARVY during pregnancy. The purpose of this registry is to collect information about the health of you and your baby. Talk with your healthcare provider about how you can take part in this registry.. are breastfeeding or plan to breastfeed. Do not breastfeed if you take BIKTARVY.You should not breastfeed if you have HIV-1 because of the risk of passing HIV-1 to your baby.At least one of the medicines in BIKTARVY can pass to your baby in your breast milk. It is not known if the other medicines in BIKTARVY can pass into your breast milk.Talk with your healthcare provider about the best way to feed your baby.. You should not breastfeed if you have HIV-1 because of the risk of passing HIV-1 to your baby.. At least one of the medicines in BIKTARVY can pass to your baby in your breast milk. It is not known if the other medicines in BIKTARVY can pass into your breast milk.. You can ask your healthcare provider or pharmacist for list of medicines that interact with BIKTARVY.. Do not start new medicine without telling your healthcare provider. Your healthcare provider can tell you if it is safe to take BIKTARVY with other medicines.. Take BIKTARVY exactly as your healthcare provider tells you to take it. BIKTARVY is taken by itself (not with other HIV-1 medicines) to treat HIV-1 infection.. Take BIKTARVY time each day with or without food.. For children unable to swallow whole tablet, the tablet can be split and each part taken separately as long as all parts are swallowed within about 10 minutes.. If you are on dialysis, take your daily dose of BIKTARVY following dialysis.. Do not change your dose or stop taking BIKTARVY without first talking with your healthcare provider. Stay under healthcare providers care during treatment with BIKTARVY.. If you take antacids that contain aluminum or magnesium, take BIKTARVY at least hours before or hours after you take these antacids.. If you take supplements or antacids that contain iron or calcium, take BIKTARVY with food at the same time that you take these supplements or antacids.. Do not miss dose of BIKTARVY.. If you take too much BIKTARVY, call your healthcare provider or go to the nearest hospital emergency room right away.. When your BIKTARVY supply starts to run low, get more from your healthcare provider or pharmacy. This is very important because the amount of virus in your blood may increase if the medicine is stopped for even short time. The virus may develop resistance to BIKTARVY and become harder to treat.. See What is the most important information should know about BIKTARVY. Changes in your immune system (Immune Reconstitution Syndrome) can happen when you start taking HIV-1 medicines. Your immune system may get stronger and begin to fight infections that have been hidden in your body for long time. Tell your healthcare provider right away if you start having any new symptoms after starting your HIV-1 medicine.. New or worse kidney problems, including kidney failure. Your healthcare provider should do blood and urine tests to check your kidneys when starting and during treatment with BIKTARVY. Your healthcare provider may tell you to stop taking BIKTARVY if you develop new or worse kidney problems.. Too much lactic acid in your blood (lactic acidosis). Too much lactic acid is serious but rare medical emergency that can lead to death. Tell your healthcare provider right away if you get these symptoms: weakness or being more tired than usual, unusual muscle pain, being short of breath or fast breathing, stomach pain with nausea and vomiting, cold or blue hands and feet, feel dizzy or lightheaded, or fast or abnormal heartbeat.. Severe liver problems. In rare cases, severe liver problems can happen that can lead to death. Tell your healthcare provider right away if you get these symptoms: skin or the white part of your eyes turns yellow, dark tea-colored urine, light-colored stools, loss of appetite for several days or longer, nausea, or stomach-area pain.. Store BIKTARVY bottle below 86 (30 C).. Keep the bottle tightly closed.. Store BIKTARVY blister pack at room temperature between 68 to 77 (20 to 25 C).. Keep BIKTARVY in its original bottle or blister pack.. BIKTARVY comes in child-resistant package.

USE IN SPECIFIC POPULATIONS SECTION.

8USE IN SPECIFIC POPULATIONS. Lactation: Women infected with HIV should be instructed not to breastfeed due to the potential for HIV transmission. (8.2)Pediatrics: Not recommended for patients weighing less than 14 kg. (8.4). Lactation: Women infected with HIV should be instructed not to breastfeed due to the potential for HIV transmission. (8.2). Pediatrics: Not recommended for patients weighing less than 14 kg. (8.4). 8.1Pregnancy. Pregnancy Exposure RegistryThere is pregnancy exposure registry that monitors pregnancy outcomes in women exposed to BIKTARVY during pregnancy. Healthcare providers are encouraged to register patients by calling the Antiretroviral Pregnancy Registry (APR) at 1-800-258-4263.. Risk SummaryThere are insufficient human data on the use of BIKTARVY during pregnancy to inform drug-associated risk of birth defects and miscarriage. Dolutegravir, another integrase inhibitor, has been associated with neural tube defects (NTDs) (see Data). Discuss the benefit-risk of using BIKTARVY with individuals of childbearing potential, particularly if pregnancy is being planned. BIKTARVY use during pregnancy has been evaluated in limited number of women reported to the APR; consequently, there are insufficient BIC data from the APR to adequately assess the risk of major birth defects. Reports of pregnant individuals treated with other drug products containing TAF or FTC contribute to APRs overall risk assessment for these components. Available data from the APR show no statistically significant difference in the overall risk of major birth defects for FTC or TAF compared with the background rate for major birth defects of 2.7% in U.S. reference population of the Metropolitan Atlanta Congenital Defects Program (MACDP) (see Data). The rate of miscarriage is not reported in the APR. The estimated background rate of miscarriage in the clinically recognized pregnancies in the U.S. general population is 15-20%.In animal reproduction studies, no evidence of adverse developmental outcomes was observed with the components of BIKTARVY at exposures that were either not maternally toxic (rabbits) or greater than (rats and mice) those in humans at the recommended human dose (RHD) (see Data ). During organogenesis, systemic exposures (AUC) to BIC were approximately 36 (rats) and 0.6 times (rabbits), to FTC were approximately 60 (mice) and 108 times (rabbits), and to TAF were approximately (rats) and 78 times (rabbits) the exposure at the RHD of BIKTARVY. In rat pre/postnatal development studies, maternal systemic exposures (AUC) were 30 times (BIC), 60 times (FTC), and 19 times (TDF) the exposures of each component in humans at the RHD.. Data. Human DataProspective reports from the APR of overall major birth defects in pregnancies exposed to the components of BIKTARVY are compared with U.S. background major birth defect rate. Methodological limitations of the APR include the use of MACDP as the external comparator group. The MACDP population is not disease-specific, evaluates women and infants from limited geographic area, and does not include outcomes for births that occurred at less than 20 weeks gestation.. Bictegravir (BIC):Data from an observational study in Botswana showed that dolutegravir, another integrase inhibitor, was associated with increased risk of neural tube defects when administered at the time of conception and in early pregnancy. Data available to date from other sources including the APR, clinical trials, and postmarketing data are insufficient to address this risk with BIC.There are an insufficient number of reports to the APR to adequately assess the risk of major birth defects associated with BIC exposure. The APR has received prospective reports of birth defects among 100 (3.0%) first trimester exposures to BIC-containing regimens during pregnancy resulting in live births. No birth defects were reported among 40 exposures during the second/third trimester.. Emtricitabine (FTC):Based on prospective reports to the APR of over 5,400 exposures to FTC-containing regimens during pregnancy resulting in live births (including over 3,900 exposed in the first trimester and over 1,500 exposed in the second/third trimester), the prevalence of birth defects in live births was 2.6% (95% CI: 2.2% to 3.2%) and 2.7% (95% CI: 1.9% to 3.7%) following first and second/third trimester exposure, respectively, to FTC-containing regimens.. Tenofovir Alafenamide (TAF):Based on prospective reports to the APR of over 660 exposures to TAF-containing regimens during pregnancy resulting in live births (including over 520 exposed in the first trimester and over 130 exposed in the second/third trimester), the prevalence of birth defects in live births was 4.2% (95% CI: 2.6% to 6.3%) and 3.0% (95% CI: 0.8% to 7.5%) following first and second/third trimester exposure, respectively, to TAF-containing regimens.. Animal Data. Bictegravir: BIC was administered orally to pregnant rats (5, 30, or 300 mg/kg/day) and rabbits (100, 300, or 1000 mg/kg/day) on gestation days through 17, and through 19, respectively. No adverse embryo-fetal effects were observed in rats and rabbits at BIC exposures (AUC) of up to approximately 36 (rats) and 0.6 (rabbits) times the exposure in humans at the RHD of BIKTARVY. Spontaneous abortion, increased clinical signs [fecal changes, thin body, and cold-to-touch], and decreased body weight were observed at maternally toxic dose in rabbits (1000 mg/kg/day; approximately 1.4 times higher than human exposure at the RHD).In pre/postnatal development study, BIC was administered orally to pregnant rats (up to 300 mg/kg/day) from gestation days to lactation/post-partum day 24. No significant adverse effects were observed in the offspring exposed daily from before birth (in utero) through lactation at maternal and pup exposures (AUC) of approximately 30 and 11 times higher, respectively, than human exposures at the RHD.. Emtricitabine: FTC was administered orally to pregnant mice (250, 500, or 1000 mg/kg/day) and rabbits (100, 300, or 1000 mg/kg/day) through organogenesis (on gestation days through 15, and through 19, respectively). No significant toxicological effects were observed in embryo-fetal toxicity studies performed with emtricitabine in mice at exposures approximately 60 times higher and in rabbits at approximately 108 times higher than human exposures at the RHD.In pre/postnatal development study with FTC, mice were administered doses up to 1000 mg/kg/day; no significant adverse effects directly related to drug were observed in the offspring exposed daily from before birth (in utero) through sexual maturity at daily exposures (AUC) of approximately 60 times higher than human exposures at the RHD.. Tenofovir alafenamide: TAF was administered orally to pregnant rats (25, 100, or 250 mg/kg/day) and rabbits (10, 30, or 100 mg/kg/day) through organogenesis (on gestation days through 17, and through 20, respectively). No adverse embryo-fetal effects were observed in rats and rabbits at TAF exposures of approximately (rats) and 78 (rabbits) times higher than the exposure in humans at the recommended daily dose of BIKTARVY. TAF is rapidly converted to tenofovir; the observed tenofovir exposure in rats and rabbits were 55 (rats) and 86 (rabbits) times higher than human tenofovir exposures at the RHD. Since TAF is rapidly converted to tenofovir and lower tenofovir exposures in rats and mice were observed after TAF administration compared to TDF administration, pre/postnatal development study in rats was conducted only with TDF. Doses up to 600 mg/kg/day were administered through lactation; no adverse effects were observed in the offspring on gestation day [and lactation day 20] at tenofovir exposures of approximately 12 [19] times higher than the exposures in humans at the RHD of BIKTARVY.. 8.2Lactation. Risk SummaryThe Centers for Disease Control and Prevention recommend that HIV-1-infected mothers in the United States not breastfeed their infants to avoid risking postnatal transmission of HIV-1 infection.It is not known whether BIKTARVY or all of the components of BIKTARVY are present in human breast milk, affects human milk production, or has effects on the breastfed infant. Based on published data, FTC has been shown to be present in human breast milk. BIC was detected in the plasma of nursing rat pups likely due to the presence of BIC in milk, and tenofovir has been shown to be present in the milk of lactating rats and rhesus monkeys after administration of TDF (see Data). It is unknown if TAF is present in animal milk.Because of the potential for 1) HIV transmission (in HIV-negative infants); 2) developing viral resistance (in HIV-positive infants); and 3) adverse reactions in breastfed infant similar to those seen in adults, instruct mothers not to breastfeed if they are receiving BIKTARVY.. Data. Animal Data. Bictegravir: BIC was detected in the plasma of nursing rat pups in the pre/postnatal development study (post-natal day 10), likely due to the presence of BIC in milk.. Tenofovir alafenamide: Studies in rats and monkeys have demonstrated that tenofovir is secreted in milk. Tenofovir was excreted into the milk of lactating rats following oral administration of TDF (up to 600 mg/kg/day) at up to approximately 24% of the median plasma concentration in the highest dosed animals at lactation day 11. Tenofovir was excreted into the milk of lactating monkeys following single subcutaneous (30 mg/kg) dose of tenofovir at concentrations up to approximately 4% of plasma concentration, resulting in exposure (AUC) of approximately 20% of plasma exposure.. 8.4 Pediatric Use. The safety and effectiveness of BIKTARVY have been established as complete regimen for the treatment of human immunodeficiency virus type (HIV-1) infection in pediatric patients weighing at least 14 kg who have no antiretroviral treatment history or to replace the current antiretroviral regimen in those who are virologically-suppressed (HIV-1 RNA less than 50 copies per mL) on stable antiretroviral regimen with no history of treatment failure and no known substitutions associated with resistance to the individual components of BIKTARVY [see Indications and Usage (1) and Dosage and Administration (2.2, 2.3)].Use of BIKTARVY in pediatric patients weighing at least 14 kg is supported by the following:trials in adults [see Clinical Studies (14.1)] an open-label trial in three age-based cohorts of virologically-suppressed pediatric subjects [see Clinical Studies (14.4)] Cohort 1: 12 to less than 18 years of age and weighing at least 35 kg receiving BIKTARVY through Week 48 (N=50),Cohort 2: to less than 12 years of age and weighing at least 25 kg receiving BIKTARVY through Week 24 (N=50), andCohort 3: at least years of age and weighing at least 14 to less than 25 kg through Week 24 (N=22). No pediatric subjects years of age were enrolled; of the pediatric subjects who were years of age at enrollment, subjects weighed between 14 to less than 15 kg. The safety and efficacy of BIKTARVY in these pediatric subjects were similar to that in adults, and there was no clinically significant change in exposure for the components of BIKTARVY [see Adverse Reactions (6.1), Clinical Pharmacology (12.3), and Clinical Studies (14.4)].Safety and effectiveness of BIKTARVY in pediatric patients weighing less than 14 kg have not been established.. trials in adults [see Clinical Studies (14.1)] an open-label trial in three age-based cohorts of virologically-suppressed pediatric subjects [see Clinical Studies (14.4)] Cohort 1: 12 to less than 18 years of age and weighing at least 35 kg receiving BIKTARVY through Week 48 (N=50),Cohort 2: to less than 12 years of age and weighing at least 25 kg receiving BIKTARVY through Week 24 (N=50), andCohort 3: at least years of age and weighing at least 14 to less than 25 kg through Week 24 (N=22). No pediatric subjects years of age were enrolled; of the pediatric subjects who were years of age at enrollment, subjects weighed between 14 to less than 15 kg. Cohort 1: 12 to less than 18 years of age and weighing at least 35 kg receiving BIKTARVY through Week 48 (N=50),. Cohort 2: to less than 12 years of age and weighing at least 25 kg receiving BIKTARVY through Week 24 (N=50), and. Cohort 3: at least years of age and weighing at least 14 to less than 25 kg through Week 24 (N=22). No pediatric subjects years of age were enrolled; of the pediatric subjects who were years of age at enrollment, subjects weighed between 14 to less than 15 kg.. 8.5Geriatric Use. Clinical trials in virologically-suppressed subjects (Trials 4449, 1844, and 1878) included 111 subjects aged 65 years and over who received BIKTARVY, including 86 patients from an open-label, single-arm trial of subjects aged 65 years and over who were switched from their previous antiretroviral regimen to BIKTARVY [see Clinical Studies (14.3)]. Of the total number of BIKTARVY-treated patients in these trials, 100 (90%) were 65 to 74 years of age, and 11 (10%) were 75 to 84 years of age. No overall differences in safety or effectiveness were observed between elderly subjects and adults between 18 and less than 65 years of age, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.. 8.6Renal Impairment. The pharmacokinetics, safety, virologic and immunologic responses of FTC and TAF (components of BIKTARVY) were evaluated in single arm, open-label trial (Trial 1825) in virologically-suppressed adults with ESRD (estimated creatinine clearance of less than 15 mL/min) on chronic hemodialysis treated with FTC+TAF in combination with elvitegravir and cobicistat as fixed-dose combination tablet for 96 weeks (N=55). In an extension phase of Trial 1825, 10 virologically-suppressed subjects switched to BIKTARVY and all remained virologically suppressed for 48 weeks [see Adverse Reactions (6.1), Clinical Pharmacology (12.3), Clinical Studies (14.3)].No dosage adjustment of BIKTARVY is recommended in patients with estimated creatinine clearance greater than or equal to 30 mL/min, or in virologically-suppressed adults (estimated creatinine clearance below 15 mL/min) who are receiving chronic hemodialysis. On days of hemodialysis, administer the daily dose of BIKTARVY after completion of hemodialysis treatment [see Dosage and Administration (2.2)] BIKTARVY is not recommended in patients with estimated creatinine clearance of below 30 mL/min, by Cockcroft-Gault, or patients with ESRD (estimated creatinine clearance below 15 mL/min) who are not receiving chronic dialysis, or patients with no antiretroviral treatment history and ESRD who are receiving chronic dialysis, as the safety and/or efficacy of BIKTARVY has not been established in these populations [see Dosage and Administration (2.4), Warnings and Precautions (5.4) and Clinical Pharmacology (12.3)]. 8.7Hepatic Impairment. No dosage adjustment of BIKTARVY is recommended in patients with mild (Child-Pugh Class A) or moderate (Child-Pugh Class B) hepatic impairment. BIKTARVY has not been studied in patients with severe hepatic impairment (Child-Pugh Class C). Therefore, BIKTARVY is not recommended for use in patients with severe hepatic impairment [see Dosage and Administration (2.4) and Clinical Pharmacology (12.3)].

WARNINGS AND PRECAUTIONS SECTION.

5WARNINGS AND PRECAUTIONS. Immune reconstitution syndrome: May necessitate further evaluation and treatment. (5.3)New onset or worsening renal impairment: Assess serum creatinine, estimated creatinine clearance, urine glucose and urine protein when initiating BIKTARVY and during therapy as clinically appropriate in all patients. Also assess serum phosphorus in patients with chronic kidney disease. (5.4)Lactic acidosis/severe hepatomegaly with steatosis: Discontinue treatment in patients who develop symptoms or laboratory findings suggestive of lactic acidosis or pronounced hepatotoxicity. (5.5). Immune reconstitution syndrome: May necessitate further evaluation and treatment. (5.3). New onset or worsening renal impairment: Assess serum creatinine, estimated creatinine clearance, urine glucose and urine protein when initiating BIKTARVY and during therapy as clinically appropriate in all patients. Also assess serum phosphorus in patients with chronic kidney disease. (5.4). Lactic acidosis/severe hepatomegaly with steatosis: Discontinue treatment in patients who develop symptoms or laboratory findings suggestive of lactic acidosis or pronounced hepatotoxicity. (5.5). 5.1Severe Acute Exacerbation of Hepatitis in Patients Coinfected with HIV-1 and HBV. Patients with HIV-1 should be tested for the presence of chronic hepatitis virus (HBV) infection before or when initiating antiretroviral therapy [see Dosage and Administration (2.1)].Severe acute exacerbations of hepatitis (e.g., liver decompensation and liver failure) have been reported in patients who are coinfected with HIV-1 and HBV and have discontinued products containing FTC and/or tenofovir disoproxil fumarate (TDF), and may occur with discontinuation of BIKTARVY. Patients coinfected with HIV-1 and HBV who discontinue BIKTARVY should be closely monitored with both clinical and laboratory follow-up for at least several months after stopping treatment. If appropriate, anti-hepatitis therapy may be warranted, especially in patients with advanced liver disease or cirrhosis, since post-treatment exacerbation of hepatitis may lead to hepatic decompensation and liver failure.. 5.2 Risk of Adverse Reactions or Loss of Virologic Response Due to Drug Interactions. The concomitant use of BIKTARVY with certain other drugs may result in known or potentially significant drug interactions, some of which may lead to [see Contraindications (4) and Drug Interactions (7.5)]: Loss of therapeutic effect of BIKTARVY and possible development of resistance.Possible clinically significant adverse reactions from greater exposures of concomitant drugs.See Table for steps to prevent or manage these possible and known significant drug interactions, including dosing recommendations. Consider the potential for drug interactions prior to and during BIKTARVY therapy; review concomitant medications during BIKTARVY therapy; and monitor for the adverse reactions associated with the concomitant drugs.. Loss of therapeutic effect of BIKTARVY and possible development of resistance.. Possible clinically significant adverse reactions from greater exposures of concomitant drugs.. 5.3Immune Reconstitution Syndrome. Immune reconstitution syndrome has been reported in patients treated with combination antiretroviral therapy. During the initial phase of combination antiretroviral treatment, patients whose immune system responds may develop an inflammatory response to indolent or residual opportunistic infections [such as Mycobacterium avium infection, cytomegalovirus, Pneumocystis jirovecii pneumonia (PCP), or tuberculosis], which may necessitate further evaluation and treatment.Autoimmune disorders (such as Graves disease, polymyositis, Guillain-Barre syndrome, and autoimmune hepatitis) have also been reported to occur in the setting of immune reconstitution; however, the time to onset is more variable, and can occur many months after initiation of treatment.. 5.4New Onset or Worsening Renal Impairment. Postmarketing cases of renal impairment, including acute renal failure, proximal renal tubulopathy (PRT), and Fanconi syndrome, have been reported with TAF-containing products; while most of these cases were characterized by potential confounders that may have contributed to the reported renal events, it is also possible these factors may have predisposed patients to tenofovir-related adverse events [see Adverse Reactions (6.1, 6.2)]. BIKTARVY is not recommended in patients with severe renal impairment (estimated creatinine clearance of 15 to below 30 mL/min), or patients with ESRD (estimated creatinine clearance below 15 mL/min) who are not receiving chronic hemodialysis, or patients with no antiretroviral treatment history and ESRD who are receiving chronic hemodialysis [see Dosage and Administration (2.4), Use in Specific Populations (8.6)].Patients taking tenofovir prodrugs who have impaired renal function and those taking nephrotoxic agents including non-steroidal anti-inflammatory drugs are at increased risk of developing renal-related adverse reactions.Prior to or when initiating BIKTARVY, and during treatment with BIKTARVY, assess serum creatinine, estimated creatinine clearance, urine glucose and urine protein in all patients as clinically appropriate. In patients with chronic kidney disease, also assess serum phosphorus. Discontinue BIKTARVY in patients who develop clinically significant decreases in renal function or evidence of Fanconi syndrome.. 5.5Lactic Acidosis/Severe Hepatomegaly with Steatosis. Lactic acidosis and severe hepatomegaly with steatosis, including fatal cases, have been reported with the use of nucleoside analogs, including emtricitabine, component of BIKTARVY, and tenofovir DF, another prodrug of tenofovir, alone or in combination with other antiretrovirals. Treatment with BIKTARVY should be suspended in any patient who develops clinical or laboratory findings suggestive of lactic acidosis or pronounced hepatotoxicity (which may include hepatomegaly and steatosis even in the absence of marked transaminase elevations).