Imaging the Effects of Serotonin 2A Receptor Modulation on Synaptic Density in Treatment-resistant Depression (SYNVEST)

The psilocybin used in this study meets quality specifications suitable for human research use. The active drug is encapsulated using a hydroxypropyl methylcellulose (HPMC) capsule and contains 25 mg of psilocybin. The psilocybin will be administered once during the trial in combination with or without risperidone 1 mg. It will also be administered in conjunction with supportive therapy.

The risperidone is encapsulated using a cellulose capsule and contains 1 mg of risperidone. The risperidone will be administered once during the trial in combination with psilocybin 25 mg. It will also be administered with supportive therapy.