What this phase means
Phase 2: researchers already know a roughly safe dose (from phase 1). This stage asks whether the treatment actually helps the condition, and watches side effects more closely.
Phase labels are FDA/ICH categories applied to the registry Phase field. They are not a finding that this study succeeded.
What the registry says happens
If you join, the listed intervention(s) are Psilocybin, Pimavanserin, or Placebo. The registry lists allocation as randomized. This is an treatment, parallel arm assignment treatment study in individuals with Major Depressive Disorder (major depression).
They plan to enroll about 60 people at New York. Taking part typically means taking a study drug (or dummy pill) plus check-ins.
Official title (unrewritten)
Investigating the Role of Serotonin in the Mechanism of Action of Psilocybin in Patients With Major Depressive Disorder
Interventions: Psilocybin, Pimavanserin, Placebo
Primary outcome (registry wording): Mystical Experience Questionnaire (MEQ-30) Score