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COMP360 psilocybin

Phase 2

PTSD - Post Traumatic Stress Disorder | Small molecule | Psychiatry |COMPASS Pathways Plc - American Depository Shares|Trials Updated: Oct 6, 2026

COMP360 psilocybin development status

Highest phase Phase 2
Registered trials 1 across 1 sponsor since May 2026

COMP360 psilocybin target and mechanism

Molecular target5-HT2A
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLED
Total Trials1
Total Enrollment300

FDA Designations

No designations recorded

COMP360 psilocybin clinical trials

COMP360 psilocybin · 1 trial · 4 indications

Phase 2 1
NCT07570654Redefine Study: A Study Evaluating the Efficacy, Safety, and Tolerability of COMP360 in Participants With Post-traumatic Stress DisorderPTSD - Post Traumatic Stress Disorder
RECRUITING300 Analytics
PHASE2RECRUITING
Redefine Study: A Study Evaluating the Efficacy, Safety, and Tolerability of COMP360 in Participants With Post-traumatic Stress Disorder
PTSD - Post Traumatic Stress DisorderUnlock trial analytics

Study Endpoints

Primary Endpoints

COMP360 25 mg versus COMP360 1 mg change from Baseline to Week 8 in CAPS-5 total severity score
8 weeks

The CAPS-5 (Clinician-Administered PTSD Scale for DSM-5) is a 30-item structured interview that yields a total severity score (0-80) reflecting PTSD symptoms. A higher CAPS-5 score indicates more severe, intense, and frequent PTSD symptoms.

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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
1 mg COMP360 psilocybinACTIVE_COMPARATOR -
10 mg COMP360 psilocybinEXPERIMENTAL -
25 mg COMP360 psilocybinEXPERIMENTAL -

Interventions

NameTypeDescription
COMP360 psilocybinDRUGCOMP360 psilocybin administered with monitoring and support
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites8

Inclusion Criteria: * 18 years or older * Diagnosed with PTSD at least 6 months ago Exclusion Criteria: \- Diagnosed with certain psychiatric conditions such as bipolar disorder, schizophrenia, OCD, anorexia, or other conditions

Countries:United StatesCanada
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Recent Changes (Last 90 Days)

LOWOct 6, 2026NCT07570654lastUpdatePostDate: changed
LOWOct 6, 2026NCT07570654lastUpdatePostDate: changed
LOWOct 1, 2026NCT07570654lastUpdatePostDate: changed
LOWOct 1, 2026NCT07570654lastUpdatePostDate: changed
LOWSep 4, 2026NCT07570654lastUpdatePostDate: changed
LOWSep 4, 2026NCT07570654lastUpdatePostDate: changed
LOWAug 19, 2026NCT07570654Status: NOT_YET_RECRUITING → RECRUITING
LOWAug 19, 2026NCT07570654Status: NOT_YET_RECRUITING → RECRUITING
LOWAug 19, 2026NCT07570654Status: NOT_YET_RECRUITING → RECRUITING

Frequently asked questions about COMP360 psilocybin

What is COMP360 psilocybin?

COMP360 psilocybin is an investigational small molecule therapeutic being developed by COMPASS Pathways Plc, whose American Depositary Shares trade under the ticker CMPS. It is a synthetic form of psilocybin under study as a treatment for psychiatric conditions, and it is currently in Phase 2 clinical development for post-traumatic stress disorder.

What is COMP360 psilocybin used for in PTSD?

COMP360 psilocybin is being studied as a treatment for post-traumatic stress disorder, or PTSD, and PTSD symptoms. It is investigational and has not been approved for any use. The ongoing Phase 2 program is evaluating its efficacy, safety, and tolerability in adults with PTSD.

What does COMP360 psilocybin target?

COMP360 psilocybin targets the 5-HT2A receptor, a serotonin receptor in the brain. Its therapeutic activity is mediated through this receptor target, which is the mechanism under investigation in the PTSD clinical program.

Who is developing COMP360 psilocybin?

COMP360 psilocybin is being developed by COMPASS Pathways Plc. The company's American Depositary Shares trade on the Nasdaq under the ticker CMPS. COMPASS Pathways is the sponsor of the Phase 2 clinical program evaluating COMP360 psilocybin in post-traumatic stress disorder.

What phase is COMP360 psilocybin in?

COMP360 psilocybin is in Phase 2 clinical development for post-traumatic stress disorder. It is investigational and has not been approved by the FDA. The Phase 2 program is currently recruiting participants and has not yet been completed.

What clinical trials is COMP360 psilocybin in?

COMP360 psilocybin is being evaluated in the Redefine Study, a Phase 2 trial registered as NCT07570654. The study is recruiting approximately 300 participants aged 18 years and older in the United States and Canada. It is randomized, double blind, and active controlled, and it assesses efficacy, safety, and tolerability in people with PTSD.