Comparing 4 approaches for investigating the importance of the subjective psychedelic
Official title: Subjective Experience Following Psilocybin
The Role of the Subjective Experience in Supporting Positive Effects Following Psilocybin: a Randomized, Controlled Clinical Trial Using Risperidone in Healthy Adults
- Phase 2
- 4 groups
- One site, in Calgary
- Recruiting
Interventions (4)
- Medication
Psilocybin high-dose
The drug product (DP) PEX010 is a capsule for oral administration and is manufactured with DS PYEX (12.5-14.0% psilocybin), excipients, and HPMC capsules. The product is manufactured in two product strengths, and this represents the high-dose
- Medication
Psilocybin low-dose
The drug product (DP) PEX010 is a capsule for oral administration and is manufactured with DS PYEX (12.5-14.0% psilocybin), excipients, and HPMC capsules. The product is manufactured in two product strengths, and this represents the low-dose.
- Medication
Risperidone 1 MG
risperidone 1mg capsules
- Medication
Placebo
inactive placebo
Canadian Sites (1)
1 of 1 recruiting
- Recruiting
University of Calgary
Calgary, Alberta
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
- +Ages 18 to 65 years of age at the time of screeningScreeningThe checks done before joining, to see whether a study fits.Read more →
- +Individuals of all sexes, gender identities, and ethnicities
- +Ability to read/write in English
- +Agree not to consume psychoactive drugs 24 hours before dosing sessions or consume psychedelics during duration of study participation
Exclusion
- −Any notable abnormality on electrocardiogram or routine medical blood or urinalysis laboratory tests
- −Current psychiatric diagnoses, such as: major depressive disorder, generalized anxiety disorder, panic disorder, social anxiety disorder, obsessive compulsive disorder, moderate to severe substance use disorders, eating disorders, personality disorders, post-traumatic stress disorder
- −Lifetime or current psychiatric diagnoses of: psychosis, schizophrenia, bipolar disorder
- −Family history: a first- or second degree relative with a history of schizophrenia or other psychotic disorders, bipolar I or II
- −Medication: Any medication with the potential to interact with the investigational medicinal products, especially those with serotonergic mechanisms of actions like SSRIs, SNRIs or MAO-Inhibitors as well as other antipsychotics
- −Current or recent (within 12 weeks) participation in a clinical trialInterventional studyA study where participants are given something to see what happens.Read more → involving medication administration
- −Cognitive impairment (Folsetin Mini Mental State Exam score \< 24)
- −Suffered a traumatic brain injury with one of the following symptoms Loss of consciousness \>30min Alteration of consciousness/mental state \>24h Post-traumatic amnesia \>1 day Glasgow Coma Scale (best available score in first 24 hours) \<13
- −Any other circumstances that, in the opinion of the investigators, compromises participant safety
- −Currently pregnancy or nursing, trying to become pregnant, or unwilling to use acceptable method of contraception during the study
- −A disorder that may interfere with drug absorption, distribution, metabolism, or excretion (including gastrointestinal surgery).
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 does not fall into the standard research categories.
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 4 groups in this study.
Group A, the comparison group, receives PlaceboPlaceboA dummy treatment with no active medicine, used for comparison.Read more →, together with one or more of: Psilocybin high-dose.
Registry label: A: High-dose psilocybin + placebo
Group B, the comparison group, receives Placebo, together with one or more of: Psilocybin low-dose.
Registry label: B: Low-dose psilocybin + placebo
Group C receives one or more of: Psilocybin high-dose and Risperidone 1 MG.
Registry label: C: High-dose psilocybin + risperidone
Group D, the comparison group, receives one or more of: Psilocybin low-dose and Risperidone 1 MG.
Registry label: D: Low-dose psilocybin + risperidone
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 — alongside the other treatment that group is given.
One group receives an existing treatment, so the two can be compared.
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 18 years to 65 years.
The study is open to people of any sex.
The study accepts healthy volunteersHealthy volunteerSomeone without the condition being studied who takes part anyway.Read more → as well as people with the condition.
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 128 people.
The study is currently expected to finish around January 2028.
The main measurement is taken over: One week and one month post-dosing.
From the trial registry
Built from these fields:
- designModule.enrollmentInfo.count
- statusModule.completionDateStruct.date
- outcomesModule.primaryOutcomes[].timeFrame
What the study measures
Positive effects — measured over One week and one month post-dosing.
From the trial registry
Built from these fields:
- outcomesModule.primaryOutcomes[].measure
- outcomesModule.primaryOutcomes[].timeFrame
Source: NCT06768944 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 high-doseDrug
The drug product (DP) PEX010 is a capsule for oral administration and is manufactured with DS PYEX (12.5-14.0% psilocybin), excipients, and HPMC capsules. The product is manufactured in two product strengths, and this represents the high-dose
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 low-doseDrug
The drug product (DP) PEX010 is a capsule for oral administration and is manufactured with DS PYEX (12.5-14.0% psilocybin), excipients, and HPMC capsules. The product is manufactured in two product strengths, and this represents the low-dose.
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 Risperidone 1 MGDrug
risperidone 1mg capsules
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 PlaceboDrug
inactive placebo
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 18 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. 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 — alongside the other treatment that group is given.
One group receives an existing treatment so the two can be compared.
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 18 years to 65 years.
It is open to people of any sex.
It accepts healthy volunteersHealthy volunteerSomeone without the condition being studied who takes part anyway.Read more → as well as people with the condition.
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: One week and one month post-dosing.
The study as a whole is currently expected to finish around 2028-01.
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 128 people.
From the trial registry
- designModule.enrollmentInfo.count
Where is this happening?
This study lists one location: Calgary, Alberta, 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
The purpose of this study is to determine the importance of the acute subjective experience induced by psilocybin (the primary component of "magic mushrooms") in facilitating positive outcomes. Participants in this study will be given psilocybin in combination with either a placebo or risperidone, an atypical antipsychotic that block the subjective effects of psilocybin.
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Complete a quick intake form and we will match you with this and other relevant trials based on your medical profile.
See if this trial could fit youThis 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.