This clinical trial is focused on studying treatment-resistant depression, a condition where individuals do not respond to typical depression treatments. The study will explore the effects of a medication called Psilocybin, which is being tested under the code name COMP360. Participants will receive two initial doses of this medication, either 25 mg or 1 mg, in capsule form. The medication will be taken orally, meaning it is swallowed. The purpose of the study is to see if Psilocybin can help improve symptoms of depression in people who have not found relief with other treatments.
During the study, participants will receive psychological support alongside the medication. The study will last for a period of 46 weeks, with the main focus on observing changes in depression symptoms by the sixth week. The study is designed to be double-blind, meaning neither the participants nor the researchers will know who is receiving which dose, to ensure unbiased results. A placebo will also be used in the study to compare the effects of the medication.
The trial aims to provide valuable information on the safety and effectiveness of Psilocybin for those with treatment-resistant depression. By comparing the effects of different doses, researchers hope to determine the best approach for using this medication to help improve the lives of those affected by this challenging condition.



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