CI

At a glance

ClinicalIndex Comparison Record
Phase 3Completed· 643 enrolled
Drug / intervention
DOR/ISL +3 moredrug
Likely dose
DOR/ISL 100 mgfrom record
Structured eligibility isn't available for this trial yet — see the full criteria in the Eligibility tab below.

Standardized by ClinicalIndex from the ClinicalTrials.gov record · verify against the source.

Search/NCT04223791
NCT04223791Phase 3Completed

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)

Merck Sharp & Dohme LLC·interventional·Posted Jan 10, 2020·Updated Mar 27, 2026

In Brief

A Phase 3 clinical trial evaluating DOR/ISL, BIC/FTC/TAF, and 2 other interventions for HIV Infection. Completed, enrolled 643 participants across 89 sites in 11 countries.

Detailed Summary

This study will evaluate the safety and efficacy of a switch to Doravirine/Islatravir (DOR/ISL) (MK-8591A) (a fixed dose combination of doravirine 100 mg and islatravir 0.75 mg) in participants living with human immunodeficiency virus-1 (HIV-1) virologically suppressed on a regimen of bictegravir/emtricitabine/tenofovir alafenamide (BIC/FTC/TAF). The primary hypothesis is that a switch to DOR/ISL (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.

Study Details

Study Typeinterventional
Allocation--
Masking--
Primary Purpose--
ConditionsHIV Infection
CountriesAustralia, Austria, Canada, Finland, France, Germany, Italy, Japan, Puerto Rico, Spain, United States
Collaborators--

Timeline

Phase 3CompletedFinished
2020202120222023202420252026
First PostedJan 10, 2020
Enrollment StartFeb 18, 2020
Primary CompletionAug 26, 2021
Study CompletionFeb 27, 2025
TodayJul 2, 2026
Enrollment to primary: 1.5 yearsPosted 6.5 years ago

Interventions

DOR/ISLdrug

100 mg DOR/ 0.75 ISL FDC single tablet taken orally once daily

BIC/FTC/TAFdrug

50 mg BIC, 200 mg FTC, and 25 mg TAF combined in a single tablet, taken orally once daily

Placebo to BIC/FTC/TAFdrug

Placebo to BIC/FTC/TAF in a single tablet taken orally, once daily

Placebo to FDC DOR/ISLdrug

Placebo to FDC DOR/ISL in a single tablet taken orally, once daily