Dolutegravir and lamivudine

7 DRUG INTERACTIONS • DOVATO is a complete regimen for the treatment of HIV-1 infection; therefore, coadministration with other antiretroviral drugs for the treatment of HIV-1 infection is not recommended. ( 7.1 ) • Refer to the full prescribing information for important drug interactions with DOVATO. ( 4 , 5.5 , 7 )

7.1 Coadministration with Other Antiretroviral Drugs DOVATO is a complete regimen for the treatment of HIV-1 infection; therefore, coadministration with other antiretroviral drugs for the treatment of HIV-1 infection is not recommended [see Indications and Usage ( 1 )] . Information regarding potential drug-drug interactions with other antiretroviral drugs is not provided [see Contraindications ( 4 ), Warnings and Precautions ( 5.5 ), Clinical Pharmacology ( 12.3 )].

7.2 Potential for DOVATO to Affect Other Drugs Dolutegravir, a component of DOVATO, inhibits the renal organic cation transporters (OCT)2 and multidrug and toxin extrusion transporter (MATE)1; thus, it may increase plasma concentrations of drugs eliminated via OCT2 or MATE1 such as dofetilide, dalfampridine, and metformin [see Contraindications ( 4 ), Drug Interactions ( 7.4 ), Clinical Pharmacology ( 12.3 )].

7.3 Potential for Other Drugs to Affect the Components of DOVATO Dolutegravir is metabolized by uridine diphosphate (UDP)-glucuronosyl transferase (UGT)1A1 with some contribution from cytochrome P450 (CYP)3A. Dolutegravir is also a substrate of UGT1A3, UGT1A9, breast cancer resistance protein (BCRP), and P-glycoprotein (P-gp) in vitro. Drugs that induce those enzymes and transporters may decrease dolutegravir plasma concentrations and reduce the therapeutic effect of DOVATO [see Drug Interactions ( 7.4 ), Clinical Pharmacology ( 12.3 )] . Coadministration of DOVATO and other drugs that inhibit these enzymes may increase dolutegravir plasma concentrations.

Coadministration of dolutegravir with polyvalent cation-containing products may lead to decreased absorption of dolutegravir [see Drug Interactions ( 7.4 ), Clinical Pharmacology ( 12.3 )] .

7.4 Established and Other Potentially Significant Drug Interactions No drug interaction studies were conducted with DOVATO. The drug interactions described are based on studies conducted with dolutegravir or lamivudine when administered alone [see Clinical Pharmacology ( 12.3 )] . Information regarding potential drug interactions with DOVATO are provided in Table 5 . These recommendations are based on either drug interaction trials or predicted interactions due to the expected magnitude of interaction and potential for serious adverse events or loss of efficacy [see Contraindications ( 4 ), Clinical Pharmacology ( 12.3 )]. Table 5.

Established and Other Potentially Significant Drug Interactions for DOVATO: Alterations in Dose May Be Recommended Based on Drug Interaction Trials or Predicted Interactions ↑ = Increase, ↓ = Decrease. a See Clinical Pharmacology ( 12.3 ) Table 8 or Table 9 for magnitude of interaction. Coadministered Drug Class: Drug Name Effect on Concentration Clinical Comment Antiarrhythmic: Dofetilide ↑Dofetilide Coadministration is contraindicated with DOVATO [see Contraindications ( 4 )] . Anticonvulsant: Carbamazepine a ↓Dolutegravir An additional dolutegravir 50-mg dose should be taken, separated by 12 hours from DOVATO [see Dosage and Administration ( 2.3 )] .

Anticonvulsants: Oxcarbazepine Phenytoin Phenobarbital ↓Dolutegravir Avoid coadministration with DOVATO because there are insufficient data to make dosing recommendations. Antidiabetic: Metformin a ↑Metformin Refer to the prescribing information for metformin for assessing the benefit and risk of concomitant use of DOVATO and metformin. Antimycobacterial: Rifampin a ↓Dolutegravir An additional 50-mg dose of dolutegravir should be taken, separated by 12 hours from DOVATO [see Dosage and Administration ( 2.3 )] . Herbal product: St. John’s wort ( Hypericum perforatum ) ↓Dolutegravir Avoid coadministration with DOVATO because there are insufficient data to make dosing recommendations.

Medications containing polyvalent cations (e.g., Mg or Al): Cation-containing antacids a or laxatives Sucralfate Buffered medications ↓Dolutegravir Administer DOVATO 2 hours before or 6 hours after taking medications containing polyvalent cations. Oral calcium and iron supplements , including multivitamins containing calcium or iron a ↓Dolutegravir When taken with food, DOVATO and supplements or multivitamins containing calcium or iron can be taken at the same time. Under fasting conditions, DOVATO should be taken 2 hours before or 6 hours after taking supplements containing calcium or iron.

Potassium channel blocker: Dalfampridine ↑Dalfampridine Elevated levels of dalfampridine increase the risk of seizures. The potential benefits of taking dalfampridine concurrently with DOVATO should be considered against the risk of seizures in these patients. Sorbitol a ↓Lamivudine When possible, avoid use of sorbitol-containing medicines with DOVATO.

8.1 Pregnancy Pregnancy Exposure Registry There is a pregnancy exposure registry that monitors pregnancy outcomes in individuals exposed to DOVATO during pregnancy. Healthcare providers are encouraged to register patients by calling the Antiretroviral Pregnancy Registry (APR) at 1‑800‑258‑4263.

Risk Summary Data from two, ongoing birth outcome surveillance studies in Botswana and Eswatini which together include over 14,000 individuals evaluated during pregnancy show similar prevalence of neural tube defects among infants born to individuals taking dolutegravir at the time of conception compared to those born to individuals taking non-dolutegravir-containing regimens at conception or infants born to HIV-negative individuals (see Data) . There are insufficient human data on the use of DOVATO during pregnancy to definitively assess a drug-associated risk for birth defects and miscarriage.

However, available human data from the APR with the individual components of DOVATO do not indicate an increased risk of birth defects (see Data) . The background risk for major birth defects for the indicated population is unknown. In the U.S. general population, the estimated background rate for major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively. In animal reproduction studies, no evidence of adverse developmental outcomes (including neural tube defects) was observed with dolutegravir at systemic exposures (AUC) less than (rabbits) and 50 times (rats) the exposure in humans at the recommended human dose (RHD) (see Data) .

Oral administration of lamivudine to pregnant rabbits during organogenesis resulted in embryolethality at systemic exposure (AUC) similar to the RHD; however, no adverse developmental effects were observed with oral administration of lamivudine to pregnant rats during organogenesis at plasma concentrations (C max ) 35 times the RHD (see Data). Data Human Data: Dolutegravir: Observational studies: The first interim analysis from an ongoing birth outcome surveillance study in Botswana identified an association between dolutegravir and an increased risk of neural tube defects when dolutegravir was administered at the time of conception and in early pregnancy.

A subsequent analysis was conducted based on a larger cohort from the birth outcome surveillance study in Botswana and included over 9,460 individuals exposed to dolutegravir at conception, 23,664 individuals exposed to non-dolutegravir-containing regimens, and 170,723 HIV-negative pregnant individuals. The prevalence of neural tube…