The Food and Drug Administration has approved the combination of lamivudine (3TC) and tenofovir disoproxil fumarate (TDF) known as Temixys for treatment of HIV-1 when used with other antiretrovirals. The approval is for adult and pediatric patients with HIV-1 who weigh at least 35 kg.
The approval is based on data through 144 weeks in a double-blind, active-controlled, multicenter trial in 600 antiretroviral-naive patients. The trial compared TDF/3TC plus efavirenz (EFV) with 3TC/EFV plus stavudine (d4T). The results showed similar responses at 144 weeks between both groups: 62% of patients taking TDF/3TC/EFV and 58% of patients taking d4T/3TC/EFV achieved and maintained fewer than 50 copies/mL of HIV-1 RNA.
The most common adverse events include headache, pain, depression, rash, and diarrhea. Prior to initiating treatment, patients should be tested for hepatitis B virus because there have been reports of 3TC-resistant strains of hepatitis B virus associated with treatment of HIV-1 with 3TC-containing regimens in coinfected patients. Patients should also be tested for estimated creatinine clearance, urine glucose, and urine protein because TDF/3TC is not recommended for patients with renal impairment.
The full prescribing information can be found on the FDA.