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Original article

Doravirine dose selection and 96-week safety and efficacy versus efavirenz in antiretroviral therapy-naive adults with HIV-1 infection in a Phase IIb trial

Jose M Gatell, Javier O Morales-Ramirez, Debbie P Hagins, Melanie Thompson, Keikawus Arastéh, Christian Hoffmann, François Raffi, Olayemi Osiyemi, Robin Dretler, Charlotte Harvey, Xia Xu, Andreas Plettenberg, Don E Smith, Joaquín Portilla, Sorin Rugina, Sushma Kumar, Colleen Frobose, Hong Wan, Anthony Rodgers, Carey Hwang, Hedy Teppler

Corresponding author name: Hedy Teppler
Corresponding author e-mail: hedy_teppler@merck.com

Citation: Antiviral Therapy 2019; 24:425-435
doi: 10.3851/IMP3323

Date accepted: 24 May 2019
Date published online: 29 July 2019


Background: The safety and efficacy of doravirine were compared with that of efavirenz as initial treatment of adults living with HIV-1 infection (NCT01632345).

Methods: A Phase IIb double-blind trial with participants stratified by screening HIV-1 RNA (≤ or >100,000 copies/ml) and randomized 1:1:1:1:1 to receive once-daily doravirine (25, 50, 100 or 200 mg) or efavirenz 600 mg (Part I) for up to 96 weeks, with open-label tenofovir disoproxil fumarate 300 mg/emtricitabine 200 mg (TDF/FTC). After dose selection at week 24, doravirine 100 mg was provided to participants receiving the other doses of doravirine and additional participants were randomized 1:1 to receive once-daily doravirine 100 mg or efavirenz 600 mg for 96 weeks with TDF/FTC (Part II). Primary outcomes were the proportion of participants with HIV-1 RNA <40 copies/ml at week 24, and central nervous system (CNS) adverse events (AEs) by weeks 8 and 24 (Parts I+II combined).

Results: 210 and 132 participants were randomized in Parts I and II, respectively, and 216 (108 on doravirine 100 mg, 108 on efavirenz) were evaluable for Parts I+II combined. At week 24, the proportion of participants with HIV-1 RNA <40 copies/ml was 72.9% for doravirine 100 mg and 73.1% for efavirenz (difference -0.5 [95% CI -12.3, 11.2]). In addition, CNS AEs were reported by 26.9% and 47.2% of doravirine and efavirenz recipients, respectively (difference -20.4 [95% CI -32.6, -7.5]; P=0.002).

Conclusions: Doravirine 100 mg with TDF/FTC demonstrated similar antiretroviral activity and superior CNS safety compared with efavirenz 600 mg with TDF/FTC.


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