Vaporized mebufotenin leads to improvement in treatment‐resistant depression

An individualized one‐day dosing regimen of a vaporized formulation of the psychedelic mebufotenin (5‐methoxy‐ N,N ‐dimethyltryptamine; 5‐MeO‐DMT) was more effective than placebo in improving depressive symptoms in adults with treatment‐resistant depression, a Phase 2b trial has found. No serious treatment‐emergent adverse events were reported during the 7‐day study. Results were published online March 2, 2026 in JAMA Psychiatry .