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Treatment-resistant Depression (TRD)PSI-GROUPNCT07737990

Psilocybin-Assisted Group Integration Psychotherapy for Treatment-Resistant Depression

A study testing Group integration therapy in people with Treatment-resistant Depression (TRD), run by Joshua Rosenblat at 1 site in Canada.

Enrolling by invitation

Enrolling by invitation. The study team selects and invites participants, usually from an existing group of patients.

Sites and contacts
Official record
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Trial summary

Psilocybin-assisted psychotherapy requires a lot of resources, with more psychotherapy being provided to integrate the meanings and insights derived from the psilocybin dosing sessions. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Treatment-resistant Depression (TRD)
What is being tested?
Group integration therapy
Could I receive a placebo?
No, everyone receives an active treatment
How many people
65 participants
Where
1 siteCanada
Study dates
1 Jul 2026to 30 Jun 2030
Phase
Interventional
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Must be deemed to have capacity to provide informed consent;
  • Must sign and date the informed consent form;
  • Stated willingness to comply with all study procedures;
  • Stated willingness to comply with group integration requirements (i.e., maintaining confidentiality of other group members and group etiquette);
  • Stated willingness to commit to attending all group sessions. Of note, participants who miss a group session will not be penalized, provided they have communicated their anticipated or unanticipated absence with the study therapist(s);
  • Ability to read and communicate in English, such that their literacy and comprehension is sufficient for understanding the consent form, study questionnaires and group participation, as evaluated by study staff obtaining consent;
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  • Met all the inclusion criteria and none of the exclusion criteria of either the PSI-1V2 or Psilo-BD clinical trials.
  • Completed the Primary Endpoint measures as part of the PSI-1V2 or Psilo-BD clinical trials.
  • Participants who are actively receiving therapy outside of this study are eligible to participate, provided the external therapy they are receiving is not psilocybin-assisted group integration psychotherapy.

Who cannot join

  • Active suicidal ideation as determined by the C-SSRS and/or clinical interview (significant suicide risk is defined by suicidal ideation as endorsed by items 4 or 5 of the C-SSRS) or active suicidality requiring involuntary inpatient treatment or recent suicide attempts within the past month;
  • Withdrawal, dropout, loss to follow-up, or demonstrated significant study intervention non-compliance of either the PSI-1V2 or Psilo-BD clinical trials.
  • Any behaviors that, in the opinion of the investigator, may interfere with the group therapy model (e.g., participants in acute crisis, demonstrated resistance to the therapeutic process of the main clinical trials, etc.);
  • Participants who are actively receiving psilocybin-assisted group integration psychotherapy outside of the study.

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

Canada1 site
  • Toronto Western Hospital

    Toronto, Ontario, M5T 2S8

Other trials in Canada

About this study

Psilocybin-assisted psychotherapy requires a lot of resources, with more psychotherapy being provided to integrate the meanings and insights derived from the psilocybin dosing sessions. If group integration therapy is beneficial, then it has the potential to reduce resources required per patient for psilocybin-assisted psychotherapy, thereby increasing the cost-effectiveness of the treatment. However, no research has been done to understand if and how group therapy can support psychedelic integration for people with mood disorders. Therefore, the purpose of this study is to explore the benefit of psilocybin-assisted group therapy and to determine if psychedelic group integration therapy is acceptable to people who have received psychedelic-assisted therapy for mood disorders.

Read the detailed description

This study is a phase II, single-arm, single-site, 21-week study evaluating efficacy, feasibility, and acceptability of psychedelic group integration therapy. Participants will join 10 group therapy sessions that will facilitate the integration of insights gained from PAP into their day-to-day lives. The study will explore pre- and post- intervention measures and integrate qualitative data with quantitative data to examine feasibility and efficacy.

Being tested
Group integration therapy
Medical subject headings
Depressive Disorder, Treatment-Resistant

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Group integration therapyOther

    The integration group will consist of 4-8 participants who have completed PAP in accordance with the primary clinical trial (PSI-1V2 or Psilo-BD, respectively). One to two therapist(s) delegated to provide PAP as part of the primary clinical trials will facilitate the group and will guide the group in exploring a new psychoeducation theme each week. There will be a total of 10 sessions, each lasting 90 minutes. During the sessions, participants will experiment with interpreting their psychedelic experience through different lenses, as it relates to their depression. The group will take a peer-support format with group members collaboratively cultivating personally optimized perspectives from their dosing sessions.

Study groups in NCT07737990
Study groupRoleWhat they receive
Group Integration TherapyOtherNot described
Receives: Other: Group integration therapy

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Impact on Behavioural Engagement with Integration

    Evaluated using the Integration Engagement Scale, a 12-item self-report rating scale, where higher scores indicate greater engagement.

    Measured: From enrolment to the primary endpoint (Week 21)

Secondary outcomes (6)
  1. Self-Reported Depression Symptoms

    Self-assessment of depression symptoms using the 16-Item Quick Inventory for Depression Symptomatology where higher scores indicate greater severity

    Measured: From enrolment to the end of the program (Week 17)

  2. Self-Reported Wellbeing

    Self-assessment of psychological wellbeing using the 5-Item World Health Organization-Five Well-Being Index where higher scores indicate greater quality of life

    Measured: From enrolment to the end of the program (Week 17)

  3. Self-Reported Anxiety Symptoms

    Self-assessment of anxiety symptoms using the Generalized Anxiety Disorder 7-Item where higher scores indicate greater severity.

    Measured: From enrolment to the end of the program (Week 17)

  4. Self-Report of the Intrapsychic Experience of Integration

    Self-assessment of feeling harmonized and improved using the 12-item Experienced Integration Scale, where higher scores indicate greater improvements

    Measured: From enrolment to the primary endpoint (Week 21)

  5. Post-Psychedelic Growth

    Self-report of positive changes following a psychedelic event using the Post-Psychedelic Growth Inventory, where greater scores indicate greater positive changes

    Measured: From enrolment to the primary end point (Week 21)

  6. Self-Reported Connectedness

    Self-assessment of sense of connectedness to self, others and the world using the Watts Connectedness Scale, where higher scores indicate greater feelings of connectedness

    Measured: From enrolment to primary endpoint (Week 21)

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted30 Jul 2026
  2. Study start1 Jul 2026 (estimated)
  3. Primary completion31 Dec 2029 (estimated)
  4. Study completion30 Jun 2030 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
65 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07737990
Sponsor's protocol ID
26-5068
Acronym
PSI-GROUP
Status last verified
Jul 2026
First submitted
27 Jul 2026
Last updated
30 Jul 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Publications

  • Zhdanava M, Pilon D, Ghelerter I, Chow W, Joshi K, Lefebvre P, Sheehan JJ. The Prevalence and National Burden of Treatment-Resistant Depression and Major Depressive Disorder in the United States. J Clin Psychiatry. 2021 Mar 16;82(2):20m13699. doi: 10.4088/JCP.20m13699.

    PubMed 33989464
  • Wong S, Kwan ATH, Teopiz KM, Le GH, Meshkat S, Ho R, d'Andrea G, Cao B, Di Vincenzo JD, Rosenblat JD, McIntyre RS. A comparison between psilocybin and esketamine in treatment-resistant depression using number needed to treat (NNT): A systematic review. J Affect Disord. 2024 Apr 1;350:698-705. doi: 10.1016/j.jad.2024.01.142. Epub 2024 Jan 18.

    PubMed 38244804
  • Scott F, Hampsey E, Gnanapragasam S, Carter B, Marwood L, Taylor RW, Emre C, Korotkova L, Martin-Dombrowski J, Cleare AJ, Young AH, Strawbridge R. Systematic review and meta-analysis of augmentation and combination treatments for early-stage treatment-resistant depression. J Psychopharmacol. 2023 Mar;37(3):268-278. doi: 10.1177/02698811221104058. Epub 2022 Jul 21.

    PubMed 35861202
  • Tyls, F., Palenicek, T., & Horacek, J. (2016). Neurobiology of the effects of psilocybin in relation to its potential therapeutic targets. In Preedy, V. R. (Ed.), Neuropathology of drug addictions and substance misuse: Volume 2: Stimulants, club and dissociative drugs, hallucinogens, steroids, inhalants and international aspects. (pp. 782-793). Elsevier eBooks. https://doi.org/10.1016/B978-0-12-800212-4.00073-X

  • Trope A, Anderson BT, Hooker AR, Glick G, Stauffer C, Woolley JD. Psychedelic-Assisted Group Therapy: A Systematic Review. J Psychoactive Drugs. 2019 Apr-Jun;51(2):174-188. doi: 10.1080/02791072.2019.1593559. Epub 2019 Apr 5.

    PubMed 30950777
  • Topp CW, Ostergaard SD, Sondergaard S, Bech P. The WHO-5 Well-Being Index: a systematic review of the literature. Psychother Psychosom. 2015;84(3):167-76. doi: 10.1159/000376585. Epub 2015 Mar 28.

    PubMed 25831962
  • Tai SJ, Nielson EM, Lennard-Jones M, Johanna Ajantaival RL, Winzer R, Richards WA, Reinholdt F, Richards BD, Gasser P, Malievskaia E. Development and Evaluation of a Therapist Training Program for Psilocybin Therapy for Treatment-Resistant Depression in Clinical Research. Front Psychiatry. 2021 Feb 3;12:586682. doi: 10.3389/fpsyt.2021.586682. eCollection 2021.

    PubMed 33643087
  • Spitzer RL, Kroenke K, Williams JB, Lowe B. A brief measure for assessing generalized anxiety disorder: the GAD-7. Arch Intern Med. 2006 May 22;166(10):1092-7. doi: 10.1001/archinte.166.10.1092.

    PubMed 16717171
  • Rush AJ, Trivedi MH, Ibrahim HM, Carmody TJ, Arnow B, Klein DN, Markowitz JC, Ninan PT, Kornstein S, Manber R, Thase ME, Kocsis JH, Keller MB. The 16-Item Quick Inventory of Depressive Symptomatology (QIDS), clinician rating (QIDS-C), and self-report (QIDS-SR): a psychometric evaluation in patients with chronic major depression. Biol Psychiatry. 2003 Sep 1;54(5):573-83. doi: 10.1016/s0006-3223(02)01866-8.

    PubMed 12946886
  • Rosenblat, J. D. (2024b). Neurobiological effects of psilocybin in treatment resistant bipolar depression (Psilo-BD). ClinicalTrials.gov Identifier: NCT06506019. Updated October 18, 2024. Accessed June 23, 2025. https://clinicaltrials.gov/study/NCT06506019

  • Rosenblat, J. D. (2024a). Psilocybin-assisted psychotherapy for treatment-resistant depression: Comparing one versus two doses of psilocybin (PSI-1V2). ClinicalTrials.gov Identifier: NCT06341426. Updated April 2, 2024. Accessed June 11, 2025. https://clinicaltrials.gov/study/NCT06341426

  • Perez N, Langlest F, Mallet L, De Pieri M, Sentissi O, Thorens G, Seragnoli F, Zullino D, Kirschner M, Kaiser S, Solmi M, Sabe M. Psilocybin-assisted therapy for depression: A systematic review and dose-response meta-analysis of human studies. Eur Neuropsychopharmacol. 2023 Nov;76:61-76. doi: 10.1016/j.euroneuro.2023.07.011. Epub 2023 Aug 7.

    PubMed 37557019
  • Naidoo N, Nguyen VT, Ravaud P, Young B, Amiel P, Schante D, Clarke M, Boutron I. The research burden of randomized controlled trial participation: a systematic thematic synthesis of qualitative evidence. BMC Med. 2020 Jan 20;18(1):6. doi: 10.1186/s12916-019-1476-5.

    PubMed 31955710
  • McIntyre RS, Alsuwaidan M, Baune BT, Berk M, Demyttenaere K, Goldberg JF, Gorwood P, Ho R, Kasper S, Kennedy SH, Ly-Uson J, Mansur RB, McAllister-Williams RH, Murrough JW, Nemeroff CB, Nierenberg AA, Rosenblat JD, Sanacora G, Schatzberg AF, Shelton R, Stahl SM, Trivedi MH, Vieta E, Vinberg M, Williams N, Young AH, Maj M. Treatment-resistant depression: definition, prevalence, detection, management, and investigational interventions. World Psychiatry. 2023 Oct;22(3):394-412. doi: 10.1002/wps.21120.

    PubMed 37713549
  • McDermut, W., Miller, I. W., & Brown, R. A. (2001). The efficacy of group psychotherapy for depression: A meta-analysis and review of the empirical research. American Psychological Association, 8(1), 98-116. https://psycnet.apa.org/doi/10.1093/clipsy.8.1.98

Questions about this trial

What is this clinical trial studying?

A study testing Group integration therapy in people with Treatment-resistant Depression (TRD), run by Joshua Rosenblat at 1 site in Canada.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 9 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: enrolling by invitation, as of the sponsor's last update on 30 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Canada. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Impact on Behavioural Engagement with Integration (time frame: From enrolment to the primary endpoint (Week 21)). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT07737990, which also lists 44 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 30 Jul 2026; AzTrials last refreshed its copy on 26 Oct 2026.

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