Open research · Psilocybin & psilocin

Countries and organisations

Explore psilocybin trials by country, sponsor and research facility. Compare registry status, study-start trends, conditions and mapped research sites.

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Explore registry geography and organisations

Trial, condition or NCT IDCountrySponsorPhaseStatusConditionReset

6 trials match this view; 7 mapped facilities. Latest indexed registry check Oct 9, 2026 01:24 UTC. Country membership uses reported locations, including locations without coordinates; Mapped-facility counts cover all sites of matching trials, including international sites, and require valid coordinates.

Enrollment sum: 153 across 6 records with a reported count. Planned and actual counts are mixed; this is not a count of unique treated participants.

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Recorded study-start years

201811

202222

202311

202411

202611

Current indexed registry status

Completed33

Active, not recruiting22

Recruiting11

Reported research conditions

Obsessive-Compulsive Disorder66

Counts describe indexed registry records, not efficacy or total research activity. A trial can count under several conditions or countries. Unknown dates are excluded from the start-year chart; future years reflect planned starts. Stopped studies may reflect recruitment, funding or strategy and are not automatically treatment failures.

Countries with reported trial locations

United States182182

Canada4141

Switzerland2121

United Kingdom1818

France77

Denmark77

Netherlands66

Czechia55

Ireland55

Sweden44

Israel44

Germany33

Australia33

Spain22

Brazil22

Pakistan22

Portugal22

Belgium22

Poland11

Austria11

New Zealand11

Finland11

Jordan11

Jamaica11

Argentina11

Matching trial records

6 matching registry records. Dates are registry milestones, not promised results announcements.
Trial	Sponsor and phase	Status	Enrollment	Start / primary completion / completion
Evaluating the Feasibility, Clinical Effects, and Safety of Psilocybin-assisted Psychotherapy for Treatment-resistant Obsessive-compulsive Disorder: An Open-label Clinical Trial NCT06299319 Obsessive-Compulsive Disorder	Centre for Addiction and Mental Health PHASE1	Completed Registry updated 2026-09-24	10 ACTUAL	2024-09-01 2026-09-04 2026-09-04
Effects of Psilocybin in Obsessive Compulsive Disorder NCT05546658 Obsessive-Compulsive Disorder	Johns Hopkins University EARLY_PHASE1	Active, not recruiting Registry updated 2026-09-04	35 ACTUAL	2022-11-28 2026-12-30 2027-09-12
A Randomized Double-masked Dose-controlled Trial to Assess the Tolerability, Safety, Subjective Experience, and Efficacy of Repeated Administration of Three Different Doses of Psilocybin Whole Mushroom for the Treatment of Obsessive-compulsive Disorder. NCT07347405 Obsessive-Compulsive Disorder	Francisco A Moreno PHASE1	Recruiting Registry updated 2026-07-23	30 ESTIMATED	2026-05-18 2028-12-31 2029-01-31
Effects of Repeated Dosing of Psilocybin on Obsessive-Compulsive Disorder: A Randomized, Waitlist-Controlled Study NCT05370911 Obsessive-Compulsive Disorder	Yale University PHASE1	Active, not recruiting Registry updated 2026-06-04	28 ACTUAL	2023-07-20 2026-02-17 2027-02
Psilocybin Treatment in Obsessive-Compulsive Disorder: a Preliminary Efficacy Study and Exploratory Investigation of Neural Correlates. NCT03356483 Obsessive-Compulsive Disorder	Yale University PHASE1	Completed Registry updated 2024-11-20	31 ACTUAL	2018-11-13 2024-07-25 2024-07-25
PsilOCD: Evaluating the Effects of the 5-HT2A Agonist Psilocybin on the Neurocognitive and Clinical Correlates of Compulsivity (A Pharmacological-Challenge Feasibility Study) NCT06258031 Obsessive-Compulsive Disorder	Imperial College London PHASE1	Completed Registry updated 2024-11-06	19 ACTUAL	2022-10-28 2024-06-28 2024-07-24

Reported research facilities

Centre for Addiction and Mental HealthToronto, Ontario, Canada

Johns Hopkins University School of MedicineBaltimore, Maryland, United States

The Clinical and Translational Sciences Research CenterTucson, Arizona, United States

Enact Research Collaborative (40 Temple St, 4th Floor)New Haven, Connecticut, United States

Yale Program for Psychedelic ResearchNew Haven, Connecticut, United States

Connecticut Mental Health CenterNew Haven, Connecticut, United States

CIPPRes ClinicLondon, United Kingdom

This list includes mapped sites of matching trials, including international sites; locations without usable coordinates are omitted. Facilities are registry-reported trial sites, not an independently verified clinic or research-centre directory. Current services and contact details must be checked at the source.