PSIL201 Long-term Follow-up Study: Psilocybin or Niacin / Major Depressive Disorder

Long-term observational cohort follow-up of participants dosed in Study PSIL201; assessments conducted by a central site at months 2–6 (±7 days) and months 8, 10, 12, 14, 16, 18, 20, 22, and 24 (±14 days).

Data collection comprises web surveys and telephone interviews to capture clinical status and patient-reported outcomes; no investigational product is administered in this study.