Head-to-head evidence
Onfasprodil vs Zelquistinel
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.
Major Depressive Disorder
Shared mechanism: NMDA receptor · full Major Depressive Disorder pipeline
Onfasprodil
Developed by Novartis
NCT03756129 · Phase 2 · completed
Participants were randomized and blinded to MIJ821, placebo, or ketamine, but the 70-person study was small and spread across six treatment groups. The clinical primary endpoint was met at 24 hours for both pooled MIJ821 dose groups versus placebo, with statistically significant MADRS score differences, but the limited sample size supports moderate rather than strong evidence.
Zelquistinel
Developed by Syndeio Biosciences
NCT03726658 · Phase 1/2 · completed
The study randomized 226 participants overall to several zelquistinel dose groups or placebo and masked both participants and investigators, but it stated that no power calculation was performed and each comparison was relatively small. The primary MADRS comparisons were clinical measures but were missed, with all reported p-values above 0.05, so the findings provide limited evidence of benefit.
Next expected readout: September 2027 · NCT06547489 (registry estimate)
The full competitive landscape for each asset (every same-race competitor with aligned evidence, sortable) is on the asset pages: Onfasprodil's landscape · Zelquistinel's landscape