Compass Says It Has Positive TRD Results For Psilocybin

COMPASS Pathways plc (Nasdaq: CMPS) announced positive results from its exploratory study of COMP360 psilocybin therapy in conjunction with SSRI use. The study wanted to test whether patients with treatment-resistant depression could tolerate and do well with psilocybin treatments while also taking regular depression medicine.

“The results of this study challenge the widely-held belief that the use of SSRI medication together with psilocybin could interfere with psilocybin’s therapeutic effect. Our findings provide a strong signal that COMP360 psilocybin therapy could be an adjunctive treatment to SSRI antidepressants as well as a monotherapy. For some patients with treatment-resistant depression, withdrawal is a difficult step even though, by definition, ‘treatment-resistant’ means that those antidepressants are not working. This is exactly why we conduct rigorous research to help guide our clinical trial design – including addressing barriers to adoption of COMP360 therapy,” stated Guy Goodwin, Compass Pathways’ Chief Medical Officer. “We are now looking forward to meeting with the FDA early in the new year in light of these new data to finalize our plans for the phase III program, which we expect to begin in Q3 2022.” Compass has Breakthrough Therapy designation with the FDA.

Study Details

Compass said in a statement that the open-label study included 19 patients from clinical sites in Ireland and the United States. The majority of patients were female (68.4%) and the average age was 42 years. The primary endpoint was the change in baseline MADRS1 total score at 3 weeks in patients having 25mg COMP360 psilocybin therapy given in augmentation with their existing SSRI antidepressant regimen. In the study, 8 of the 19 patients (42.1%) were responders1 at week 3 (compared with 36.7% at week 3 in the phase IIb trial) and all 8 were also remitters1. The mean reduction from baseline observed in MADRS total score was 14.9 at week 3 (compared with a 12.0 mean reduction in MADRS in the phase IIb trial). There was a rapid response from day 2 to week 3 after COMP360 therapy, which is also consistent with the phase IIb result. The baseline MADRS score of patients entering the study was 31.7, representing moderate to severe depression. MADRS scores were assessed by blinded independent raters at baseline, on the day following COMP360 psilocybin therapy, and at weeks 1, 2 and 3. Patients were then invited to participate in COMPASS’s long-term follow-up study which also includes patients from the phase IIb trial.

COMP360 psilocybin therapy using a 25mg dose also showed overall signals of improvement in most other measures including improvement in anxiety, clinician and self-rated depressive symptoms, and positive and negative affect.


According to Compass, more than 320 million people globally suffer from major depressive disorder (MDD). About a third of these patients – 100 million people – aren’t helped by existing therapies and suffer from treatment-resistant depression (TRD). As many as 30% of these attempt suicide at least once during their lifetime. TRD carries two to three times the medical costs of a non-TRD MDD patient, and patients with TRD have higher all-cause mortality compared with non-TRD MDD patients. The TRD population is by definition more difficult to treat and more likely to relapse than patients with major depressive disorder. In 2018, COMPASS received FDA Breakthrough Therapy designation for its COMP360 psilocybin therapy for TRD.

Debra Borchardt

Debra Borchardt is the Co-Founder, and Executive Editor of GMR. She has covered the cannabis industry for several years at Forbes, Seeking Alpha and TheStreet. Prior to becoming a financial journalist, Debra was a Vice President at Bear Stearns where she held a Series 7 and Registered Investment Advisor license. Debra has a Master's degree in Business Journalism from New York University.

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