Head-to-head evidence
Dapivirine vs Ulonivirine
Same mechanism, same race: design-graded trial evidence for both assets, with the grading rationale shown. Grades describe the quality of the evidence, never the merits of either security.
HIV
Shared mechanism: HIV reverse transcriptase · full HIV pipeline
Dapivirine · Dapivirine Vaginal Ring
Marketed by International Partnership for Microbicides
NCT01617096 · Phase 3 · completed
This Phase 3 trial randomized 2,629 women to a monthly dapivirine vaginal ring or a placebo ring, with both participants and investigators blinded. The primary endpoint was HIV-1 seroconversion, and the results show 71 seroconversions among 1,313 women in the dapivirine group versus 97 among 1,313 in the placebo group; however, no p-value or confidence interval is provided in the registry, so it is uncertain whether this difference was statistically significant. Because the design is robust but the primary comparison's significance is not established, the evidence is moderate rather than strong.
Ulonivirine
Developed by Merck & Co.
NCT04564547 · Phase 2 · completed
Randomized, triple-masked phase 2b switch study of once-weekly islatravir plus ulonivirine in virologically suppressed HIV-1 infection (161 participants). All three primary endpoints are adverse-event rates reported descriptively; no efficacy comparison was posted as primary.
Next expected readout: August 2027 · NCT06891066 (registry estimate)
The full competitive landscape for each asset (every same-race competitor with aligned evidence, sortable) is on the asset pages: Dapivirine's landscape · Ulonivirine's landscape