Testing psilocybin (25 mg) with psilocybin against a placebo for bipolar II depression
Official title: Psilocybin-Assisted Therapy for Treatment-Resistant Depression in Bipolar II Disorder
Psilocybin-Assisted Therapy for Treatment-Resistant Depression in Bipolar II Disorder: A Randomized Controlled Trial
- Phase 2
- 2 groups
- Sites in Vancouver, Ottawa and 1 more city
- Recruiting
Interventions
- Medication
psilocybin (25 mg)
Single-dose psilocybin (25 mg)-assisted therapy (PAT)
- Medication
psilocybin 1mg micro-dose
Single dose active placebo psilocybin-assisted therapy
Canadian Sites (3)
1 of 3 recruiting
- Recruiting
Djavad Mowafaghian Centre for Brain Health
Vancouver, British Columbia
- Not yet recruiting
Department of Psychiatry, University of Ottawa, The Ottawa Hospital
Ottawa, Ontario
- Not yet recruiting
Department of Psychiatry, University of Toronto, University Health Network,
Toronto, Ontario
Eligibility Criteria
See who this study is looking for15 criteria
The trial’s own eligibility text, word for word from the registry. Only the trial site can say who takes part.
Inclusion
- +You are male or female aged 19 to 65 years inclusive.
- +You have sufficient English language skills to understand, consentInformed consentThe process of being told what taking part involves, then choosing freely.Read more → to, and comply with study requirements, study visits, and to return to the clinic for follow-upFollow-upContinued check-ins after the treatment part is finished.Read more → evaluations.
- +You have a diagnosis of bipolar disorder type II, and are currently in a major depressive episode.
- +Your current medications have been at a stable dose for two weeks prior to the dosing visit.
- +You are willing, for the entire duration of the study, to practice highly effective methods of contraception (e.g., contraceptive pills, intrauterine device or system, vasectomy and tubal ligation, or double-barrier methods of contraception) OR agree to completely abstain from heterosexual intercourse. Females who do not have childbearing potential are required to be postmenopausal for at least 1 year before the screening visitScreeningThe checks done before joining, to see whether a study fits.Read more → (confirmed by an FSH test) OR surgically sterile.
Exclusion
- −You have a history of psychotic symptoms.
- −You have a history of seizures.
- −You have a first-degree relative, such as your parent, sibling, or child, with a diagnosis of a primary psychotic disorder (e.g., schizoaffective disorder, schizophrenia).
- −You have a current unstable or inadequately treated medical illness, especially cardiovascular illness, except for the current depression.
- −You recently (i.e., within the past 6 weeks) started taking treatment for your acute bipolar depressive episode.
- −You recently (i.e., within the past 8 weeks) began structured psychotherapy (e.g., cognitive-behavioral therapy, interpersonal psychotherapy, family-focused therapy, or interpersonal and social rhythm therapy).
- −You have a history of nonresponse or intolerance to psilocybin.
- −You have, in the past 6 months, used any psychedelic drugs, including ketamine, LSD, or psilocybin-containing mushrooms.
- −You have a history of non-response to electroconvulsive therapy.
- −You are pregnant or lactating.
In plain language
Assembled directly from this trial’s registry record. Every sentence traces to a field below — nothing here is generated or interpreted.
What this study is
This study is testing a treatment for a condition.
Phase 2Phase 2A middle-stage study looking at what a treatment does and watching for side effects.Read more → — a middle-stage study in a few hundred people at most, looking at what the treatment does and watching for side effectsSide effectAn unwanted effect thought to be caused by the treatment itself.Read more →.
From the trial registry
Built from these fields:
- designModule.designInfo.primaryPurpose
- designModule.phases
Who receives what
There are 2 groups in this study.
Group A receives psilocybin (25 mg).
Registry label: A: Active
Group B, the placeboPlaceboA dummy treatment with no active medicine, used for comparison.Read more → group, receives psilocybin 1mg micro-dose.
Registry label: B: Placebo
From the trial registry
Built from these fields:
- armsInterventionsModule.armGroups[].label
- armsInterventionsModule.armGroups[].type
- armsInterventionsModule.armGroups[].interventionNames
How the study is run
Which group you would be placed in is decided by chance, like a coin flip — not by you and not by your doctor.
You, the study team, the people giving the treatment, and the people analysing the results would all be kept unaware of which group you are in until the study ends.
From the trial registry
Built from these fields:
- designModule.designInfo.allocation
- designModule.designInfo.maskingInfo.masking
Is there a placebo?
One group receives a placeboPlaceboA dummy treatment with no active medicine, used for comparison.Read more → — a dummy treatment with no active medicine in it.
From the trial registry
Built from these fields:
- armsInterventionsModule.armGroups[].type
- armsInterventionsModule.armGroups[].interventionNames
Who the study is looking for
The study lists an age range of 19 years to 65 years.
The study is open to people of any sex.
The study does not accept healthy volunteersHealthy volunteerSomeone without the condition being studied who takes part anyway.Read more →.
These are the criteria the study lists. Only the trial siteTrial siteA hospital or clinic where a study is actually run.Read more → can decide whether someone can take part.
From the trial registry
Built from these fields:
- eligibilityModule.minimumAge
- eligibilityModule.maximumAge
- eligibilityModule.sex
- eligibilityModule.healthyVolunteers
How big and how long
The study aims to enrol about 90 people.
The study is currently expected to finish around December 2028.
The main measurement is taken over: BaselineBaselineYour starting measurements, taken before treatment begins.Read more → to Week 3.
From the trial registry
Built from these fields:
- designModule.enrollmentInfo.count
- statusModule.completionDateStruct.date
- outcomesModule.primaryOutcomes[].timeFrame
What the study measures
Change in depressive symptoms — measured over BaselineBaselineYour starting measurements, taken before treatment begins.Read more → to Week 3.
From the trial registry
Built from these fields:
- outcomesModule.primaryOutcomes[].measure
- outcomesModule.primaryOutcomes[].timeFrame
Source: NCT06943573 on ClinicalTrials.gov. The full registry text is further down this page — this summary never replaces it.
Not medical advice. What do these terms mean?
What is being tested — in plain terms
About psilocybin (25 mg)Drug
Single-dose psilocybin (25 mg)-assisted therapy (PAT)
From the trial registry — its own words, unedited.
What a drug is here: A medicine — a chemical or small-molecule treatment — given as the thing being studied.
Read the full explanation → · in clinical review
About psilocybin 1mg micro-doseDrug
Single dose active placebo psilocybin-assisted therapy
From the trial registry — its own words, unedited.
What a drug is here: A medicine — a chemical or small-molecule treatment — given as the thing being studied.
Read the full explanation → · in clinical review
Common questions
Answered from this trial’s registry record. Where the record doesn’t say, these answers say so rather than filling the gap.
Am I eligible for this trial?
Only the trial siteTrial siteA hospital or clinic where a study is actually run.Read more → can decide whether someone can take part. Concord cannot make that determination, and neither can any tool that has not examined you.
What the study lists: an age range of 19 years to 65 years.
The full inclusionInclusion criteriaThe things you must have or be for a study to consider you.Read more → and exclusion criteriaExclusion criteriaThe things that would prevent someone from taking part.Read more → are published on this page, exactly as the study team wrote them.
The useful next step is to bring this trial to your doctor. Answering a few questions first gives them something concrete to review.
From the trial registry
- eligibilityModule.minimumAge
- eligibilityModule.maximumAge
- eligibilityModule.eligibilityCriteria
Is there a placebo?
Yes. This study includes a placeboPlaceboA dummy treatment with no active medicine, used for comparison.Read more → group — a dummy treatment with no active medicine in it.
From the trial registry
- armsInterventionsModule.armGroups[].type
Would I know which treatment I am getting?
You, the study team, the people giving the treatment, and the people analysing the results would all be kept unaware of which group you are in until the study ends.
Which group you would be placed in is decided by chance, like a coin flip — not by you and not by your doctor.
From the trial registry
- designModule.designInfo.maskingInfo.masking
- designModule.designInfo.allocation
Who can join?
The study lists an age range of 19 years to 65 years.
It is open to people of any sex.
It does not accept healthy volunteersHealthy volunteerSomeone without the condition being studied who takes part anyway.Read more →.
Only the trial siteTrial siteA hospital or clinic where a study is actually run.Read more → can confirm whether a particular person can take part.
From the trial registry
- eligibilityModule.minimumAge
- eligibilityModule.maximumAge
- eligibilityModule.sex
- eligibilityModule.healthyVolunteers
How long would this take?
The study's main measurement is taken over: BaselineBaselineYour starting measurements, taken before treatment begins.Read more → to Week 3.
The study as a whole is currently expected to finish around 2028-12.
How long any one person takes part can differ from the study length. The study team can tell you what the schedule looks like in practice.
From the trial registry
- outcomesModule.primaryOutcomes[].timeFrame
- statusModule.completionDateStruct.date
How many people are taking part?
The study aims to enrol about 90 people.
From the trial registry
- designModule.enrollmentInfo.count
Where is this happening?
This study lists 3 locations, including: Vancouver, British Columbia, Canada; Ottawa, Ontario, Canada; Toronto, Ontario, Canada.
Sites can open and close during a study, so confirm with the team before travelling.
From the trial registry
- trial_locations
About This Trial
This study is a 12-week (in addition to up to 30 days of screening) randomized, double-blind, placebo-controlled, parallel-group trial. The primary objective of this study is to assess the effectiveness, safety, and tolerability of single-dose psilocybin (25 mg)-assisted therapy in comparison to active placebo (1 mg micro-dose) psilocybin-assisted therapy in patients with bipolar II depression who have not responded to adequate trials with at least two first or second-line treatments for bipolar II depression (i.e. quetiapine, lithium, lamotrigine, sertraline, or venlafaxine as monotherapy or adjunctive therapy, or bupropion adjunctive therapy). The active placebo is a substance that looks identical to the study medication but contains less therapeutic ingredients, and thus is less capable of producing the transformative and meaningful aspects of psychedelic experience compared to the 25 mg dose. Participants will have a total of 11 study visits over a period of up to 16 weeks, which includes 5 therapy sessions from trained study therapists.
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This page is for informational purposes only and does not constitute medical advice. Clinical trial eligibility can only be determined by the trial site after proper screening. Trial information is sourced from ClinicalTrials.gov and may not reflect the most current status. Always consult your healthcare provider before making decisions about clinical trial participation.