Head-to-head evidence
Doravirine 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
Doravirine · Pifeltro
Marketed by Merck & Co.
NCT02275780 · Phase 3 · completed
This was a randomized, double-blind, active-controlled Phase 3 trial with 769 enrolled adults (385 doravirine, 384 darunavir/ritonavir). The primary endpoint was virologic suppression (HIV-1 RNA <50 copies/mL) at Week 48, a hard clinical endpoint. The non-inferiority comparison was met: the difference was 3.9 percentage points (95% CI -1.6 to 9.4), with the lower bound above the prespecified -10% margin. The trial therefore provides strong evidence that doravirine is non-inferior to darunavir/ritonavir.
Next expected readout: November 2026 · NCT04892654 (registry estimate)
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: Doravirine's landscape · Ulonivirine's landscape