Safety and Efficacy of Reduced Versus Standard Dose Efavirenz (EFV) Plus Two Nucleotides in Antiretroviral-naïve Adults.

Summary

Clinical data suggests that the standard dose of the anti-HIV medication, efavirenz (EFV), could be reduced without compromising its effectiveness. Lower drug doses could have fewer side effects and would make EFV more affordable. The purpose of this study is to compare the safety and effectiveness, over 96 weeks, of standard (600mg) versus reduced dose (400mg) EFV in controlling HIV as part of initial combination antiretroviral therapy.

Timeline

Start

2011-08

Primary completion

2013-06

Completion

2014-08

Publications

• Results ENCORE1 Study Group. Efficacy of 400 mg efavirenz versus standard 600 mg dose in HIV-infected, antiretroviral-naive adults (ENCORE1): a randomised, double-blind, placebo-controlled, non-inferiority trial. Lancet. 2014 Apr 26;383(9927):1474-1482. doi: 10.1016/S0140-6736(13)62187-X. Epub 2014 Feb 10.
• Results ENCORE1 Study Group; Carey D, Puls R, Amin J, Losso M, Phanupak P, Foulkes S, Mohapi L, Crabtree-Ramirez B, Jessen H, Kumar S, Winston A, Lee MP, Belloso W, Cooper DA, Emery S. Efficacy and safety of efavirenz 400 mg daily versus 600 mg daily: 96-week data from the randomised, double-blind, placebo-controlled, non-inferiority ENCORE1 study. Lancet Infect Dis. 2015 Jul;15(7):793-802. doi: 10.1016/S1473-3099(15)70060-5. Epub 2015 Apr 12.
• Winston A, Amin J, Clarke A, Else L, Amara A, Owen A, Barber T, Jessen H, Avihingsanon A, Chetchotisakd P, Khoo S, Cooper DA, Emery S, Puls R; ENCORE Cerebrospinal Fluid (CSF) Substudy Team; ENCORE Cerebrospinal Fluid CSF Substudy Team. Cerebrospinal fluid exposure of efavirenz and its major metabolites when dosed at 400 mg and 600 mg once daily: a randomized controlled trial. Clin Infect Dis. 2015 Apr 1;60(7):1026-32. doi: 10.1093/cid/ciu976. Epub 2014 Dec 11.

Drugs

Indications