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, or Speech therapy. The registry lists allocation as na. This Phase 2a clinical trial is an open-label, single-group, within-subjects pilot study designed to measure the safety, feasibility, and preliminary how well it works of psilocybin as a therapeutic intervention for adults with developmental stuttering.
They plan to enroll about 25 people at New York. Taking part typically means taking a study drug (or dummy pill), following a program (exercise, therapy, diet, or an app) plus check-ins.
Official title (unrewritten)
Effects of Psilocybin on Speech Fluency, Struggle, and Brain Activity in People Who Stutter
Interventions: Psilocybin, Speech therapy
Primary outcome (registry wording): Change in Stuttering Severity Instrument - 4th Edition (SSI-4) total score