This study explores how well COMP360, a medicine, works for people with treatment-resistant depression (TRD). TRD is when depression doesn't get better after trying at least two different medicines. The study involves 255 adults, split into two groups: two-thirds get COMP360, and one-third get a placebo (a fake treatment). The study lasts around 62 weeks and has three parts: A, B, and C.
In Part A, participants will get a single dose of COMP360 or placebo and be monitored for six weeks. Part B and C will check how well COMP360 works over a longer time and if it’s safe to use again. Participants must be at least 18 years old and have tried other depression treatments without success.
- Study duration: About 62 weeks.
- Participants: Must be 18+ with previous depression treatment failures.
- Risks: Participants cannot have certain mental health conditions or treatments.