ABACAVIR, LAMIVUDINE AND ZIDOVUDINE (lamivudine 150 mg zidovudine 300 mg abacavir sulfate 300 mg) Dailymed

Pregnancy Exposure Registry There is a pregnancy exposure registry that monitors pregnancy outcomes in women exposed to abacavir, lamivudine and zidovudine tablets during pregnancy. Healthcare providers are encouraged to register patients by calling the Antiretroviral Pregnancy Registry (APR) at 1-800-258-4263. Risk Summary Available data from the APR show no difference in the overall risk of birth defects for abacavir, lamivudine, or zidovudine compared with the background rate for birth defects of 2.7% in the Metropolitan Atlanta Congenital Defects Program (MACDP) reference population [see Data]. The APR uses the MACDP as the U.S. reference population for birth defects in the general population. The MACDP evaluates women and infants from a limited geographic area and does not include outcomes for births that occurred at less than 20 weeks' gestation. The rate of miscarriage is not reported in the APR. The estimated background rate of miscarriage in clinically recognized pregnancies in the U.S. general population is 15% to 20%. The background risk for major birth defects and miscarriage for the indicated population is unknown. Hyperlactatemia, which may be due to mitochondrial dysfunction, has been reported in infants with in utero exposure to zidovudine-containing products. These events were transient and asymptomatic in most cases. There have been few reports of developmental delay, seizures, and other neurological disease. However, a causal relationship between these events and exposure to zidovudine-containing products in utero or peri-partum has not been established (see Data). In animal reproduction studies, oral administration of abacavir to pregnant rats during organogenesis resulted in fetal malformations and other embryonic and fetal toxicities at exposures 35 times the human exposure (AUC) at the recommended clinical daily dose. However, no adverse developmental effects were observed following oral administration of abacavir to pregnant rabbits during organogenesis, at exposures approximately 9 times the human exposure (AUC) at the recommended clinical dose. Oral administration of lamivudine to pregnant rabbits during organogenesis resulted in embryolethality at systemic exposure (AUC) similar to the recommended clinical dose; however, no adverse development effects were observed with oral administration of lamivudine to pregnant rats during organogenesis at plasma concentrations (Cmax) 35 times the recommended clinical dose. Administration of oral zidovudine to female rats prior to mating and throughout gestation resulted in embryotoxicity at doses that produced systemic exposure (AUC) approximately 33 times higher than exposure at the recommended clinical dose. However, no embryotoxicity was observed after oral administration of zidovudine to pregnant rats during organogenesis at doses that produced systemic exposure (AUC) approximately 117 times higher than exposures at the recommended clinical dose. Administration of oral zidovudine to pregnant rabbits during organogenesis resulted in embryotoxicity at doses that produced systemic exposure (AUC) approximately 108 times higher than exposure at the recommended clinical dose. However, no embryotoxicity was observed at doses that produced systemic exposure (AUC) approximately 23 times higher than exposures at the recommended clinical dose (see Data). Data Human Data: Abacavir Based on prospective reports to the APR of  exposures to abacavir during pregnancy resulting in live births (including over 1,300 exposed in the first trimester and over 1,300 exposed in the second/third trimester), there was no difference between the overall risk of birth defects for abacavir compared with the background birth defect rate of 2.7% in a U.S. reference population of the MACDP. The prevalence of defects in live births was 3.2% (95% CI: 2.3% to 4.3%) following first trimester exposure to abacavir-containing regimens and 2.9% (95% CI: 2.1% to 4%) following second/third trimester exposure to abacavir-containing regimens. Abacavir has been shown to cross the placenta and concentrations in neonatal plasma at birth were essentially equal to those in maternal plasma at delivery [see CLINICAL PHARMACOLOGY (12.3)]. Lamivudine Based on prospective reports to the APR of of exposures to lamivudine during pregnancy resulting in live births (including over 5300 exposed in the first trimester and over 7,400 exposed in the second/third trimester), there was no difference between the overall risk of birth defects for lamivudine compared with the background birth defect rate of 2.7% in a U.S. reference population of the MACDP. The prevalence of birth defects in live births was 3.1% (95% CI: 2.7% to 3.6%) following first trimester exposure to lamivudine-containing regimens and 2.9% (95% CI: 2.5% to 3.3%) following second/third trimester exposure to lamivudine-containing regimens.. Lamivudine pharmacokinetics were studied in pregnant women during 2 clinical trials conducted in South Africa. The trials assessed pharmacokinetics in 16 women at 36 weeks' gestation using 150 mg lamivudine twice daily with zidovudine, 10 women at 38 weeks' gestation using 150 mg lamivudine twice daily with zidovudine, and 10 women at 38 weeks' gestation using lamivudine 300 mg twice daily without other antiretrovirals. These trials were not designed or powered to provide efficacy information. Lamivudine concentrations were generally similar in maternal, neonatal, and umbilical cord serum samples. In a subset of subjects, amniotic fluid specimens were collected following natural rupture of membranes and confirmed that lamivudine crosses the placenta in humans. Based on limited data at delivery, median (range) amniotic fluid concentrations of lamivudine were 3.9 (1.2 to 12.8)–fold greater compared with paired maternal serum concentration (n = 8). Zidovudine Based on prospective reports to the APR of exposures to zidovudine during pregnancy resulting in live births (including over 4,200 exposed in the first trimester and over 9,700 exposed in the second/third trimester), there was no difference between the overall risk of birth defects for zidovudine compared with the background birth defect rate of 2.7% in a U.S. reference population of the MACDP. The prevalence of birth defects in live births was 3.2% (95% CI: 2.7% to 3.8%) following first trimester exposure to zidovudine-containing regimens and 2.8% (95% CI: 2.5% to 3.1%) following second/third trimester exposure to zidovudine-containing regimens. A randomized, double-blind, placebo-controlled trial was conducted in HIV-1-infected pregnant women to determine the utility of zidovudine for the prevention of maternal-fetal HIV-1 transmission. Zidovudine treatment during pregnancy reduced the rate of maternal-fetal HIV-1 transmission from 24.9% for infants born to placebo-treated mothers to 7.8% for infants born to mothers treated with zidovudine. There were no differences in pregnancy-related adverse events between the treatment groups. Of the 363 neonates that were evaluated, congenital abnormalities occurred with similar frequency between neonates born to mothers who received zidovudine and neonates born to mothers who received placebo. The observed abnormalities included problems in embryogenesis (prior to 14 weeks) or were recognized on ultrasound before or immediately after initiation of trial drug. See full prescribing information for RETROVIR® (zidovudine) and COMBIVIR® (lamivudine and zidovudine). Zidovudine has been shown to cross the placenta and concentrations in neonatal plasma at birth were essentially equal to those in maternal plasma at delivery [see CLINICAL PHARMACOLOGY (12.3)]. There have been reports of mild, transient elevations in serum lactate levels, which may be due to mitochondrial dysfunction, in neonates and infants exposed in utero or peri-partum to zidovudine-containing products. There have been few reports of developmental delay, seizures, and other neurological disease. However, a causal relationship between these events and exposure to zidovudine-containing products in utero or peri-partum has not been established. The clinical relevance of transient elevations in serum lactate is unknown. Animal Data: Abacavir Abacavir was administered orally to pregnant rats (at 100, 300, and 1,000 mg per kg per day) and rabbits (at 125, 350, or 700 mg per kg per day) during organogenesis (on Gestation Days 6 through 17 and 6 through 20, respectively). Fetal malformations (increased incidences of fetal anasarca and skeletal malformations) or developmental toxicity (decreased fetal body weight and crown-rump length) were observed in rats at doses up to 1,000 mg per kg per day, resulting in exposures approximately 35 times the human exposure (AUC) at the recommended daily dose. No developmental effects were observed in rats at 100 mg per kg per day, resulting in exposures (AUC) 3.5 times the human exposure at the recommended daily dose. In a fertility and early embryo-fetal development study conducted in rats (at 60, 160, or 500 mg per kg per day), embryonic and fetal toxicities (increased resorptions, decreased fetal body weights) or toxicities to the offspring (increased incidence of stillbirth and lower body weights) occurred at doses up to 500 mg per kg per day. No developmental effects were observed in rats at 60 mg per kg per day, resulting in exposures (AUC) approximately 4 times the human exposure at the recommended daily dose. Studies in pregnant rats showed that abacavir is transferred to the fetus through the placenta. In pregnant rabbits, no developmental toxicities and no increases in fetal malformations occurred at up to the highest dose evaluated, resulting in exposures (AUC) approximately 9 times the human exposure at the recommended dose. Lamivudine Lamivudine was administered orally to pregnant rats (at 90, 600, and 4,000 mg per kg per day) and rabbits (at 90, 300, and 1,000 mg per kg per day and at 15, 40, and 90 mg per kg per day) during organogenesis (on Gestation Days 7 through 16 [rat] and 8 through 20 [rabbit]). No evidence of fetal malformations due to lamivudine was observed in rats and rabbits at doses producing plasma concentrations (Cmax) approximately 35 times higher than human exposure at the recommended daily dose. Evidence of early embryolethality was seen in the rabbit at systemic exposures (AUC) similar to those observed in humans, but there was no indication of this effect in the rat at plasma concentrations (Cmax) 35 times higher than human exposure at the recommended daily dose. Studies in pregnant rats showed that lamivudine is transferred to the fetus through the placenta. In the fertility/pre-and postnatal development study in rats, lamivudine was administered orally at doses of 180, 900, and 4,000 mg per kg per day (from prior to mating through postnatal Day 20). In the study, development of the offspring, including fertility and reproductive performance, was not affected by maternal administration of lamivudine. Zidovudine A study in pregnant rats (at 50, 150, or 450 mg per kg per day starting 26 days prior to mating through Gestation to postnatal Day 21) showed increased fetal resorptions at doses that produced systemic exposures (AUC) approximately 33 times higher than exposure at the recommended daily human dose (300 mg twice daily). However, in an oral embryo-fetal development study in rats (at 125, 250, or 500 mg per kg per day on Gestation Days 6 through 15), no fetal resorptions were observed at doses that produced systemic exposure (AUC) approximately 117 times higher than exposures at the recommended daily human dose. An oral embryo-fetal development study in rabbits (at 75, 150, or 500 mg per kg per day on gestation Days 6 through 18) showed increased fetal resorptions at the 500-mg-per-kg-per-day dose which produced systemic exposures (AUC) approximately 108 times higher than exposure at the recommended daily human dose; however, no fetal resorptions were noted at doses up to 150 mg per kg per day, which produced systemic exposure (AUC) approximately 23 times higher than exposures at the recommended daily human dose. These oral embryo-fetal development studies in the rat and rabbit revealed no evidence of fetal malformations with zidovudine. In another developmental toxicity study, pregnant rats (dosed at 3,000 mg per kg per day from Days 6 through 15 of gestation) showed marked maternal toxicity and an increased incidence of fetal malformations at exposures greater than 300 times the recommended daily human dose based on AUC. However, there were no signs of fetal malformations at doses up to 600 mg per kg per day.

Pharmacokinetics in Adults In a single-dose, 3-way crossover bioavailability trial of 1 abacavir, lamivudine and zidovudine tablet versus 1 ZIAGEN tablet (300 mg), 1 EPIVIR tablet (150 mg), plus 1 RETROVIR tablet (300 mg) administered simultaneously in healthy subjects (n = 24), there was no difference in the extent of absorption, as measured by the area under the plasma concentration-time curve (AUC) and maximal peak concentration (Cmax), of all 3 components. One abacavir, lamivudine and zidovudine tablet was bioequivalent to 1 ZIAGEN tablet (300 mg), 1 EPIVIR tablet (150 mg), plus 1 RETROVIR tablet (300 mg) following single-dose administration to fasting healthy subjects (n = 24). Abacavir: Following oral administration, abacavir is rapidly absorbed and extensively distributed. After oral administration of 300 mg of abacavir twice daily in 20 subjects, Cmax was 3.0 ± 0.89 mcg per mL (mean ± SD) and AUC(0 to 12 h) was 6.02 ± 1.73 mcg•hour per mL. Binding of abacavir to human plasma proteins is approximately 50% and was independent of concentration. Total blood and plasma drug-related radioactivity concentrations are identical, demonstrating that abacavir readily distributes into erythrocytes. The primary routes of elimination of abacavir are metabolism by alcohol dehydrogenase to form the 5′-carboxylic acid and glucuronyl transferase to form the 5′-glucuronide. Lamivudine: Following oral administration, lamivudine is rapidly absorbed and extensively distributed. Binding to plasma protein is low. Approximately 70% of an intravenous dose of lamivudine is recovered as unchanged drug in the urine. Metabolism of lamivudine is a minor route of elimination. In humans, the only known metabolite is the trans-sulfoxide metabolite (approximately 5% of an oral dose after 12 hours). Zidovudine: Following oral administration, zidovudine is rapidly absorbed and extensively distributed. Binding to plasma protein is low. Zidovudine is eliminated primarily by hepatic metabolism. The major metabolite of zidovudine is GZDV. GZDV AUC is about 3-fold greater than the zidovudine AUC. Urinary recovery of zidovudine and GZDV accounts for 14% and 74% of the dose following oral administration, respectively. A second metabolite, 3′-amino-3′  deoxythymidine (AMT), has been identified in plasma. The AMT AUC was one-fifth of the zidovudine AUC. In humans, abacavir, lamivudine, and zidovudine are not significantly metabolized by CYP enzymes. The pharmacokinetic properties of abacavir, lamivudine, and zidovudine in fasting subjects are summarized in Table 3. Header$Parameter Abacavir Lamivudine Zidovudine Oral bioavailability (%) 86 ± 25 n = 6 86 ± 16 n = 12 64 ± 10 n = 5 Apparent volume of distribution (L/kg) 0.86 ± 0.15 n = 6 1.3 ± 0.4 n = 20 1.6 ± 0.6 n = 8 Systemic clearance (L/h/kg) 0.80 ± 0.24 n = 6 0.33 ± 0.06 n = 20 1.6 ± 0.6 n = 6 Renal clearance (L/h/kg) 0.007 ± 0.008 n = 6 0.22 ± 0.06 n = 20 0.34 ± 0.05 n = 9 Elimination half-life (h) 1.45 ± 0.32 n = 20 13 to 19b 0.5 to 3b Effect of Food on Absorption of Abacavir, Lamivudine and Zidovudine Tablets Administration with food in a single-dose bioavailability trial resulted in lower Cmax, similar to results observed previously for the reference formulations. The average [90% CI] decrease in abacavir, lamivudine, and zidovudine Cmax was 32% [24% to 38%], 18% [10% to 25%], and 28% [13% to 40%], respectively, when administered with a high-fat meal, compared with administration under fasted conditions. Administration of abacavir, lamivudine and zidovudine tablets with food did not alter the extent of abacavir, lamivudine, and zidovudine absorption (AUC), as compared with administration under fasted conditions (n = 24) [see DOSAGE AND ADMINISTRATION (2.2)]. Specific Populations Patients with Renal Impairment:   Abacavir, Lamivudine and Zidovudine Tablets  The effect of renal impairment on the combination of abacavir, lamivudine, and zidovudine has not been evaluated (see the U.S. prescribing information for the individual abacavir, lamivudine, and zidovudine components). Patients with Hepatic Impairment:   Abacavir, Lamivudine and Zidovudine Tablets  The effect of hepatic impairment on the combination of abacavir, lamivudine, and zidovudine has not been evaluated (see the U.S. prescribing information for the individual abacavir, lamivudine, and zidovudine components). Pregnant Women:   Abacavir  Abacavir pharmacokinetics were studied in 25 pregnant women during the last trimester of pregnancy receiving abacavir 300 mg twice daily. Abacavir exposure (AUC) during pregnancy was similar to those in postpartum and in HIV-infected non-pregnant historical controls. Consistent with passive diffusion of abacavir across the placenta, abacavir concentrations in neonatal plasma cord samples at birth were essentially equal to those in maternal plasma at delivery. Lamivudine Lamivudine pharmacokinetics were studied in 36 pregnant women during 2 clinical trials conducted in South Africa. Lamivudine pharmacokinetics in pregnant women were similar to those seen in non-pregnant adults and in postpartum women. Lamivudine concentrations were generally similar in maternal, neonatal, and umbilical cord serum samples. Zidovudine Zidovudine pharmacokinetics have been studied in a Phase 1 trial of 8 women during the last trimester of pregnancy. Zidovudine pharmacokinetics were similar to those of nonpregnant adults. Consistent with passive transmission of the drug across the placenta, zidovudine concentrations in neonatal plasma at birth were essentially equal to those in maternal plasma at delivery. Although data are limited, methadone maintenance therapy in 5 pregnant women did not appear to alter zidovudine pharmacokinetics. Geriatric Patients:   The pharmacokinetics of abacavir, lamivudine, and zidovudine have not been studied in subjects over 65 years of age. Male and Female Patients : There are no significant or clinically relevant gender differences in the pharmacokinetics of the individual components (abacavir, lamivudine, or zidovudine) based on the available information that was analyzed for each of the individual components. Racial Groups:   Abacavir and Lamivudine  There are no significant or clinically relevant racial differences in pharmacokinetics of abacavir or lamivudine based on the available information that was analyzed for each of the individual components. Zidovudine The pharmacokinetics of zidovudine with respect to race have not been determined. Drug Interaction Studies: The drug interaction trials described were conducted with abacavir, lamivudine or zidovudine as single entities; no drug interaction trials have been conducted using abacavir, lamivudine and zidovudine tablets. No clinically significant drug interactions are expected between abacavir, lamivudine, and zidovudine. Effect of Abacavir and Lamivudine on the Pharmacokinetics of Other Agents : In vitro studies have shown that abacavir has potential to inhibit CYP1A1 and limited potential to inhibit metabolism mediated by CYP3A4. Lamivudine does not inhibit or induce CYP3A4. Abacavir and lamivudine do not inhibit or induce other CYP enzymes (such as CYP2C9, or CYP2D6). Based on in vitro study results, abacavir and lamivudine at therapeutic drug exposures are not expected to affect the pharmacokinetics of drugs that are substrates of the following transporters: organic anion transporter polypeptide (OATP)1B1/3, breast cancer resistance protein (BCRP) or P-glycoprotein (P-gp), organic cation transporter (OCT)1, OCT2, OCT3 (lamivudine only), or multidrug and toxic extrusion protein (MATE)1 and MATE2-K. Riociguat: Coadministration of a single dose of riociguat (0.5 mg) to HIV-1–infected subjects receiving fixed-dose abacavir/dolutegravir/lamivudine is reported to increase riociguat AUC(∞) compared with riociguat AUC(∞) reported in healthy subjects due to CYP1A1 inhibition by abacavir. The exact magnitude of increase in riociguat exposure has not been fully characterized based on findings from two studies [see Drug Interactions (7.1)]. Effect of Other Agents on the Pharmacokinetics of Abacavir, Lamivudine, or Zidovudine: Abacavir, lamivudine, and zidovudine are not significantly metabolized by CYP P450 enzymes; therefore, CYP enzyme inhibitors or inducers are not expected to affect their concentrations. In vitro, abacavir is not a substrate of OATP1B1, OATP1B3, OCT1, OCT2, OAT1, MATE1, MATE2-K, multidrug resistance-associated protein (MRP)2 or MRP4; therefore, drugs that modulate these transporters are not expected to affect abacavir plasma concentrations. Abacavir is a substrate of BCRP and P-gp in vitro; however, considering its absolute bioavailability (83%), modulators of these transporters are unlikely to result in a clinically relevant impact on abacavir concentrations. Lamivudine is a substrate of MATE1, MATE2-K, and OCT2 in vitro. Trimethoprim (an inhibitor of these drug transporters) has been shown to increase lamivudine plasma concentrations. This interaction is not considered clinically significant as no dose adjustment of lamivudine is needed. Lamivudine is a substrate of P-gp and BCRP; however, considering its absolute bioavailability (87%), it is unlikely that these transporters play a significant role in the absorption of lamivudine. Therefore, coadministration of drugs that are inhibitors of these efflux transporters is unlikely to affect the disposition and elimination of lamivudine. Glucuronyl Transferase : Due to the common metabolic pathways of abacavir and zidovudine via glucuronyl transferase, 15 HIV-1-infected subjects were enrolled in a crossover trial evaluating single doses of abacavir (600 mg), lamivudine (150 mg), and zidovudine (300 mg) alone or in combination. Analysis showed no clinically relevant changes in the pharmacokinetics of abacavir with the addition of lamivudine or zidovudine or the combination of lamivudine and zidovudine. Lamivudine exposure (AUC decreased 15%) and zidovudine exposure (AUC increased 10%) did not show clinically relevant changes with concurrent abacavir. Ethanol : Abacavir has no effect on the pharmacokinetic properties of ethanol. Ethanol decreases the elimination of abacavir causing an increase in overall exposure. Interferon Alfa : There was no significant pharmacokinetic interaction between lamivudine and interferon alfa in a trial of 19 healthy male subjects. Methadone : In a trial of 11 HIV-1-infected subjects receiving methadone-maintenance therapy (40 mg and 90 mg daily), with 600 mg of abacavir twice daily (twice the currently recommended dose), oral methadone clearance increased 22% (90% CI: 6% to 42%) [see DRUG INTERACTIONS (7.1)]. The addition of methadone has no clinically significant effect on the pharmacokinetic properties of abacavir. Ribavirin : In vitro data indicate ribavirin reduces phosphorylation of lamivudine, stavudine, and zidovudine. However, no pharmacokinetic (e.g., plasma concentrations or intracellular triphosphorylated active metabolite concentrations) or pharmacodynamic (e.g., loss of HIV-1/HCV virologic suppression) interaction was observed when ribavirin and lamivudine (n = 18), stavudine (n = 10), or zidovudine (n = 6) were coadministered as part of a multi-drug regimen to HIV-1/HCV co-infected subjects [see WARNINGS AND PRECAUTIONS (5.6)]. Sorbitol (Excipient): Lamivudine and sorbitol solutions were coadministered to 16 healthy adult subjects in an open-label, randomized-sequence, 4-period, crossover trial. Each subject received a single 300-mg dose of lamivudine oral solution alone or coadministered with a single dose of 3.2 grams, 10.2 grams, or 13.4 grams of sorbitol in solution. Coadministration of lamivudine with sorbitol resulted in dose-dependent decreases of 20%, 39%, and 44% in the AUC (0-24); 14%, 32%, and 36% in the AUC( ∞ ); and 28%, 52%, and 55% in the Cmax; of lamivudine, respectively. The effects of other coadministered drugs on abacavir, lamivudine, or zidovudine are provided in Table 4. Table 4. Effect of Coadministered Drugs on Abacavir, Lamivudine, and Zidovudine AUCSee DRUG INTERACTIONS (7) for additional information on drug interactions. ↑= Increase; ↓= Decrease; ↔= No significant change; AUC = Area under the concentration versus time curve; CI = Confidence interval. Coadministered  Drug  and  Dose Drug  and  Dose n Concentrations  of  Abacavir ,  Lamivudine ,  or  Zidovudine Concentration  of  Coadministered  Drug AUC Variability Ethanol0.7 g/kg Abacavir single600 mg 24 ↑41% 90% CI:35% to 48% ↔The drug-drug interaction was only evaluated in males. Nelfinavir750 mg every 8 h x 7 to 10 days Lamivudine single150 mg 11 ↑10% 95% CI:1% to 20% ↔ Trimethoprim 160 mg/ Sulfamethoxazole 800 mg daily x 5 days Lamivudine single300 mg 14 ↑43% 90% CI:32% to 55% ↔ Atovaquone750 mg every 12 h with food Zidovudine200 mg every8 h 14 ↑31% Range: 23% to 78%Estimated range of percent difference. ↔ Clarithromycin 500 mg twice daily Zidovudine100 mg every4 h x 7 days 4 ↓12% Range:↓34% to ↑14% Not Reported Fluconazole 400 mg daily Zidovudine200 mg every8 h 12 ↑74% 95% CI:54% to 98% Not Reported Methadone 30 to 90 mg daily Zidovudine200 mg every4 h 9 ↑43% Range:16% to 64% ↔ Nelfinavir 750 mg every 8 h x 7 to 10 days Zidovudinesingle200 mg 11 ↓35% Range:28% to 41% ↔ Probenecid 500 mg every 6 h x2 days Zidovudine2 mg/kg every8 h x 3 days 3 ↑106% Range:100% to 170% c Not Assessed Rifampin   600 mg daily x   14 days Zidovudine200 mg every8 h x 14 days 8 ↓47% 90% CI:41% to 53% Not Assessed Ritonavir   300 mg every 6 h x 4   days Zidovudine200 mg every 8 h x 4 days 9 ↓25% 95% CI:15% to 34% ↔ Valproic acid   250 mg or 500 mg   every 8 h x 4 days Zidovudine100 mg every 8 h x4 days 6 ↑80% Range:64% to 130% Not Assesed

Carcinogenicity Abacavir:   Abacavir was administered orally at 3 dosage levels to separate groups of mice and rats in 2-year carcinogenicity studies. Results showed an increase in the incidence of malignant and non-malignant tumors. Malignant tumors occurred in the preputial gland of males and the clitoral gland of females of both species, and in the liver of female rats. In addition, non-malignant tumors also occurred in the liver and thyroid gland of female rats.  These observations were made at systemic exposures in the range of 6 to 32 times the human exposure at the recommended dose of 600 mg. Lamivudine:   Long-term carcinogenicity studies with lamivudine in mice and rats showed no evidence of carcinogenic potential at exposures up to 10 times (mice) and 58 times (rats) the human exposures at the recommended dose of 300 mg. Zidovudine:   Zidovudine was administered orally at 3 dosage levels to separate groups of mice and rats (60 females and 60 males in each group). Initial single daily doses were 30, 60, and 120 mg per kg per day in mice and 80, 220, and 600 mg per kg per day in rats. The doses in mice were reduced to 20, 30, and 40 mg per kg per day after Day 90 because of treatment-related anemia, whereas in rats only the high dose was reduced to 450 mg per kg per day on Day 91 and then to 300 mg per kg per day on Day 279. In mice, 7 late-appearing (after 19 months) vaginal neoplasms (5 non-metastasizing squamous cell carcinomas, 1 squamous cell papilloma, and 1 squamous polyp) occurred in animals given the highest dose. One late-appearing squamous cell papilloma occurred in the vagina of a middle-dose animal. No vaginal tumors were found at the lowest dose. In rats, 2 late-appearing (after 20 months), non-metastasizing vaginal squamous cell carcinomas occurred in animals given the highest dose. No vaginal tumors occurred at the low or middle dose in rats. No other drug-related tumors were observed in either sex of either species. At doses that produced tumors in mice and rats, the estimated drug exposure (as measured by AUC) was approximately 3 times (mouse) and 24 times (rat) the estimated human exposure at the recommended therapeutic dose of 100 mg every 4 hours. It is not known how predictive the results of rodent carcinogenicity studies may be for humans. Two transplacental carcinogenicity studies were conducted in mice. One study administered zidovudine at doses of 20 mg per kg per day or 40 mg per kg per day from gestation Day 10 through parturition and lactation with dosing continuing in offspring for 24 months postnatally. At these doses, exposures were approximately 3 times the estimated human exposure at the recommended doses. After 24 months at the 40-mg-per-kg-per-day dose, an increase in incidence of vaginal tumors was noted with no increase in tumors in the liver or lung or any other organ in either gender. These findings are consistent with results of the standard oral carcinogenicity study in mice, as described earlier. A second study administered zidovudine at maximum tolerated doses of 12.5 mg per day or 25 mg per day (approximately 1,000 mg per kg nonpregnant body weight or approximately 450 mg per kg of term body weight) to pregnant mice from Days 12 through 18 of gestation. There was an increase in the number of tumors in the lung, liver, and female reproductive tracts in the offspring of mice receiving the higher dose level of zidovudine. Mutagenicity Abacavir:   Abacavir induced chromosomal aberrations both in the presence and absence of metabolic activation in an in vitro cytogenetic study in human lymphocytes. Abacavir was mutagenic in the absence of metabolic activation, although it was not mutagenic in the presence of metabolic activation in an L5178Y mouse lymphoma assay. Abacavir was clastogenic in males and not clastogenic in females in an in vivo mouse bone marrow micronucleus assay. Abacavir was not mutagenic in bacterial mutagenicity assays in the presence and absence of metabolic activation. Lamivudine:   Lamivudine was mutagenic in an L5178Y mouse lymphoma assay and clastogenic in a cytogenetic assay using cultured human lymphocytes. Lamivudine was not mutagenic in a microbial mutagenicity assay, in an in vitro cell transformation assay, in a rat micronucleus test, in a rat bone marrow cytogenetic assay, and in an assay for unscheduled DNA synthesis in rat liver. Zidovudine:   Zidovudine was mutagenic in an L5178Y mouse lymphoma assay, positive in an in vitro cell transformation assay, clastogenic in a cytogenetic assay using cultured human lymphocytes, and positive in mouse and rat micronucleus tests after repeated doses. It was negative in a cytogenetic study in rats given a single dose. Impairment of Fertility Abacavir: Abacavir did not affect male or female fertility in rats at a dose associated with exposures (AUC) approximately 3.3 times (male) or 4.1 times (female) those in humans at the clinically recommended dose. Lamivudine: Lamivudine did not affect male or female fertility in rats at doses up to 4,000 mg per kg per day, associated with concentrations approximately 42 times (male) or 63 times (female) higher than the concentrations (Cmax) in humans at the dose of 300 mg. Zidovudine: Zidovudine, administered to male and female rats at doses up to 450 mg per kg per day, which is 7 times the recommended adult dose (300 mg twice daily) based on body surface area, had no effect on fertility based on conception rates.

MEDICATION GUIDE Abacavir, Lamivudine and Zidovudine Tablets (a-BAK-a-vir , la-MIV-ue-deen, zye-DOE-vue-deen) What is the most important information I should know about abacavir, lamivudine and zidovudine tablets? Abacavir, lamivudine and zidovudine tablets can cause serious side effects, including: Serious allergic reactions (hypersensitivity reaction) that can cause death have happened with abacavir, lamivudine and zidovudine tablets and other abacavir-containing products. Your risk of this allergic reaction is much higher if you have a gene variation called HLA-B*5701. Your healthcare provider can determine with a blood test if you have this gene variation. If you get a symptom from 2 or more of the following groups while taking abacavir, lamivudine  and zidovudine tablets, call your healthcare provider right away to find out if you should stop taking abacavir, lamivudine and zidovudine tablets. Symptom ( s ) Group  1  Fever  Group  2  Rash  Group  3  Nausea ,  vomiting ,  diarrhea ,  abdominal  ( stomach  area )  pain  Group  4  Generally  ill  feeling ,  extreme  tiredness ,  or  achiness  Group  5  Shortness  of  breath ,  cough ,  sore  throat  A ul of these symptoms is on the Warning Card your pharmacist gives you. Carry this Warning Card with you at all times. If you stop abacavir, lamivudine and zidovudine tablets because of an allergic reaction, never take abacavir, lamivudine and zidovudine tablets or any other abacavir-containing medicine (EPZICOM®, TRIUMEQ®, or ZIAGEN®) again. If you have an allergic reaction, dispose of any unused abacavir, lamivudine and zidovudine tablets. Ask your pharmacist how to properly dispose of medicines. If you take abacavir, lamivudine and zidovudine tablets or any other abacavir-containing medicine again after you have had an allergic reaction, within hours you may get life-threatening symptoms that may include very low blood pressure or death . If you stop abacavir, lamivudine and zidovudine tablets for any other reason, even for a few days, and you are not allergic to abacavir, lamivudine and zidovudine tablets, talk with your healthcare provider before taking it again. Taking abacavir, lamivudine and zidovudine tablets again can cause a serious allergic or life-threatening reaction, even if you never had an allergic reaction to it before. If your healthcare provider tells you that you can take abacavir, lamivudine and zidovudine tablets again, start taking it when you are around medical help or people who can call a healthcare provider if you need one. Blood problems. Zidovudine, one of the medicines in abacavir, lamivudine and zidovudine tablets, can cause serious blood cell problems. These include reduced numbers of white blood cells (neutropenia) and extremely reduced numbers of red blood cells (anemia). These blood cell problems are especially likely to happen in people with advanced human immunodeficiency virus 1 (HIV-1) infection or Acquired Immune Deficiency Syndrome (AIDS). Your healthcare provider should check your blood cell counts regularly during treatment with abacavir, lamivudine and zidovudine tablets. Muscle pain or weakness can happen during treatment with abacavir, lamivudine and zidovudine tablets. Zidovudine one of the medicines in abacavir, lamivudine and zidovudine tablets, can cause muscle pain or weakness when used for a long time. Too much Lactic acid in your blood (lactic acidosis). Lactic acidosis is a serious medical emergency that can lead to death. Call your healthcare provider right away if you get any of the following symptoms that could be signs of lactic acidosis: feel very weak or tired unusual (not normal) muscle pain trouble breathing stomach pain with nausea and vomiting feel cold, especially in your arms and legs feel dizzy or light-headed have a fast or irregular heartbeat Severe liver problems in some cases, these serious liver problems can lead to death. Your liver may become large (hepatomegaly) and you may develop fat in your liver (steatosis). Call your healthcare provider right away if you get any of the following signs or symptoms of liver problems: your skin or the white part of your eyes turns yellow (jaundice) dark or "tea-colored" urine light colored stools (bowel movements) loss of appetite for several days or longer nausea pain, aching, or tenderness on the right side of your stomach area You may be more likely to get lactic acidosis or serious liver problems if you are female or very overweight (obese).     Worsening of hepatitis B virus (HBV) infection. HBV infection and take abacavir, lamivudine and zidovudine tablets your HBV may get worse (flare-up) if you stop taking abacavir, lamivudine and zidovudine tablets. A "flare-up" is when your HBV infection suddenly returns in a worse way than before.   $$UnOrderedul   Do not run out of abacavir, lamivudine and zidovudine tablets. Refill your prescription or talk to your healthcare provider before your abacavir, lamivudine and zidovudine tablets are all gone.   Do not stop abacavir, lamivudine and zidovudine tablets without first talking to your healthcare provider.   If you stop taking abacavir, lamivudine and zidovudine tablets, your healthcare provider will need to check your   health often and do blood tests regularly for several months to check your liver function and monitor your HBV infection. It may be necessary to give you a medicine to treat HBV. Tell your healthcare provider about any new or unusual symptoms you may have after you stop taking abacavir, lamivudine and zidovudine tablets.   $$EndUnOrderedul   Resistant HBV. If you have HIV-1 and HBV, the HBV can change (mutate) during your treatment with abacavir, lamivudine and zidovudine tablets and become harder to treat (resistant).   Use with interferon and ribavirin-based regimens. Worsening of liver disease that has caused death has happened in people infected with both HIV-1 and hepatitis C virus who are taking HIV-1 medicines and are also being treated for hepatitis C with interferon alfa with or without ribavirin. If you are taking abacavir, lamivudine and zidovudine tablets and interferon alfa with or without ribavirin, tell your healthcare provider if you have any new symptoms.   For more information about side effects, see "What are the possible side effects of abacavir, lamivudine and zidovudine tablets. What are abacavir, lamivudine and zidovudine tablets? Abacavir, lamivudine and zidovudine tablet is a prescription  medicine used alone or with other  HIV-1 medicines to treat HIV-1 infection. HIV-1 is the virus that causes AIDS. Abacavir, lamivudine and zidovudine tablet contains the  prescription medicines, abacavir , lamivudine  and zidovudine . Abacavir, lamivudine and zidovudine tablets should not be used in children weighing less than 88 pounds (40 kg). Do not take abacavir, lamivudine and zidovudine tablets if you:   have a certain type of gene variation called the HLA-B*5701 allele. Your healthcare provider will test you for this before prescribing treatment with abacavir, lamivudine and zidovudine tablets. are allergic to abacavir, lamivudine, zidovudine or any of the ingredients in abacavir, lamivudine and zidovudine tablets. See the end of this Medication Guide for a complete ul of ingredients in abacavir, lamivudine and zidovudine tablets. have certain liver problems. Before you take abacavir, lamivudine and zidovudine tablets, tell your healthcare provider about all of your medical conditions, includingif you: have been tested and know whether or not you have a particular gene variation called HLA-B*5701. have or have had liver problems, including hepatitis B or C virus infection. have kidney problems. have low blood cell counts (bone marrow problem). Ask your healthcare provider if you are not sure. have heart problems, smoke, or have diseases that increase your risk of heart disease such as high blood pressure, high cholesterol, or diabetes. are pregnant or plan to become pregnant. Pregnancy Registry. There is a pregnancy registry for women who take HIV-1 medicines during pregnancy. The purpose of this registry is to collect information about the health of you and your baby. Talk to your healthcare provider about how you can take part in this registry. are breastfeeding or plan to breastfeed. Do not breastfeed if you take abacavir, lamivudine and zidovudine tablets. You should not breastfeed if you have HIV-1 because of the risk of passing HIV-1 to your baby. Tell your healthcare provider about all the medicines you take, including prescription and over-the- counter medicines, vitamins, and herbal supplements. Some medicines interact with abacavir, lamivudine and zidovudine tablets. Keep a ul of your medicines to show your healthcare provider and pharmacist when you get a new medicine. You can ask your healthcare provider or pharmacist for a ul of medicines that interact with abacavir, lamivudine and zidovudine tablets. Do not start taking a new medicine without telling your healthcare provider. Your healthcare provider can tell you if it is safe to take abacavir, lamivudine and zidovudine tablets with other medicines. How should I take abacavir, lamivudine and zidovudine tablets? Take abacavir, lamivudine and zidovudine tablets exactly as your healthcare provider tells you to take it. Do not change your dose or stop taking abacavir, lamivudine and zidovudine tablets without talking with your healthcare provider. If you miss a dose of abacavir, lamivudine and zidovudine tablets, take it as soon as you remember. Do not take 2 doses at the same time or take more than your healthcare provider tells you to take. Stay under the care of a healthcare provider during treatment with abacavir, lamivudine and zidovudine tablets. Abacavir, lamivudine and zidovudine tablets may be taken with or without food. Do not run out of abacavir, lamivudine and zidovudine tablets. The virus in your blood may increase and the virus may become harder to treat. When your supply starts to run low, get more from your healthcare provider or pharmacy. If you take too much abacavir, lamivudine and zidovudine tablets, call your healthcare provider or go to the nearest hospital emergency room right away. What are the possible side effects of abacavir, lamivudine and zidovudine tablets? Abacavir, lamivudine and zidovudine tablets can cause serious side effects including : See "What is the most important information I should know about abacavir, lamivudine and zidovudine tablets?" 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 a long time. Tell your healthcare provider right away if you start having new symptoms after you start taking abacavir, lamivudine and zidovudine tablets. Loss of body fat can happen in people who take HIV-1 medicines that contain zidovudine. This loss of fat may occur in the legs, arms, buttocks, and face. The loss of fat may be permanent and long-term health effects are not known. Heart attack Some HIV-1 medicines including abacavir, lamivudine and zidovudine tablets may increase your risk of heart attack. The most common side effects of abacavir, lamivudine and zidovudine tablets include: nausea headache weakness or tiredness vomiting Tell your healthcare provider if you have any side effect that bothers you or that does not go away. These are not all the possible side effects of abacavir, lamivudine and zidovudine tablets. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. How should I store abacavir, lamivudine and zidovudine tablets? Store abacavir, lamivudine and zidovudine tablets at room temperature. Keep abacavir, lamivudine and zidovudine tablets and all medicines out of the reach of children. General information for safe and effective use of abacavir, lamivudine and zidovudine tablets. Medicines are sometimes prescribed for purposes other than those uled in a Medication Guide. Do not use abacavir, lamivudine and zidovudine tablets for a condition for which it was not prescribed. Do not give abacavir, lamivudine and zidovudine tablets to other people, even if they have the same symptoms that you have. It may harm them. You can ask your healthcare provider or pharmacist for the information about abacavir, lamivudine and zidovudine tablets that is written for health professionals. What are the ingredients in abacavir, lamivudine and zidovudine tablets? Active ingredients: abacavir, lamivudine and zidovudine Inactive ingredients: crospovidone, magnesium stearate, microcrystalline cellulose, povidone, and yellow ferric oxide. Tablet film coating contains: opadry green made of FD&C blue no. 2, polyethylene glycol, polyvinyl alcohol, talc, titanium dioxide and yellow ferric oxide. This Medication Guide has been approved by the U.S. Food and Drug Administration. The brands uled are trademarks of their respective owners and are not trademarks of Lupin Pharmaceuticals, Inc. The makers of these brands are not affiliated with and do not endorse Lupin Pharmaceuticals, Inc. or its products. Manufactured for: Lupin Pharmaceuticals, Inc. Baltimore, Maryland 21202 United States Manufactured by: Lupin Limited Pithampur (M.P.) - 454 775 India Revised: May 2021                                                                ID#: 267580 For more information go to www.lupinpharmaceuticals.com or call 1-800-399-2561.