for people ages 18 years and up (full criteria)
at San Francisco, California and other locations
study started
completion around



This study will evaluate the safety and efficacy of a switch to MK-8591A (a fixed dose combination of doravirine and islatravir) in human immunodeficiency virus -1 (HIV-1)-infected participants virologically suppressed on a regimen of bictegravir/emtricitabine/tenofovir alafenamide (BIC/FTC/TAF). The primary hypothesis is that a switch to MK-8591A will be non-inferior to continued treatment with BIC/FTC/TAF as assessed by the proportion of participants with HIV-1 ribonucleic acid (RNA) ≥50 copies/mL at Week 48. Participants who benefit from their assigned intervention (as determined by investigator) will be able to continue treatment through a 24-week study extension.

Official Title

A Phase 3, Randomized, Active-Controlled, Double-Blind Clinical Study to Evaluate a Switch to Doravirine/Islatravir (DOR/ISL) Once-Daily in Participants With HIV-1 Virologically Suppressed on Bictegravir/Emtricitabine/Tenofovir Alafenamide (BIC/FTC/TAF)


HIV Infection, HIV Infections, Islatravir, DOR/ISL, BIC/FTC/TAF


You can join if…

Open to people ages 18 years and up

  • Is HIV-1 positive with plasma Human Immunodeficiency Virus 1 (HIV-1) RNA <50 copies/mL at screening.
  • Has been receiving BIC/FTC/TAF therapy with documented viral suppression (HIV-1 RNA <50 copies/mL) for ≥3 months prior to signing informed consent and has no history of prior virologic treatment failure on any past or current regimen.
  • Female is eligible to participate if she is not pregnant or breastfeeding, and at least one of the following conditions applies: Is not a woman of childbearing potential (WOCBP); is a WOCBP and using an acceptable contraceptive method, or be abstinent from heterosexual intercourse as their preferred and usual lifestyle; a WOCBP must have a negative highly sensitive pregnancy test ([urine or serum] as required by local regulations) within 24 hours before the first dose of study intervention; if a urine test cannot be confirmed as negative (e.g. an ambiguous result), a serum pregnancy test is required. In such cases, the participant must be excluded from participation if the serum pregnancy result is positive.

You CAN'T join if...

  • Has HIV-2 infection.
  • Has an active diagnosis of hepatitis due to any cause, including active Hepatitis B Virus (HBV) co-infection.
  • Has a history of malignancy ≤5 years prior to signing informed consent except for adequately treated basal cell or squamous cell skin cancer, in situ cervical cancer, or cutaneous Kaposi's sarcoma.
  • Is taking or is anticipated to require systemic immunosuppressive therapy, immune modulators, or any prohibited therapies.
  • Is currently participating in or has participated in a clinical study with an investigational compound or device from 45 days prior to Day 1 through the study treatment period.
  • Has a documented or known virologic resistance to DOR.
  • Female expects to conceive or donate eggs at any time during the study.


  • Zuckerberg San Francisco General Hospital UCSF ( Site 2743)
    San Francisco California 94110 United States
  • University of California, Davis, Division of ID Research ( Site 2702)
    Sacramento California 95811 United States


in progress, not accepting new patients
Start Date
Completion Date
Merck Sharp & Dohme LLC
Merck Clinical Trials Information
Phase 3 research study
Study Type
About 643 people participating
Last Updated