Evidence map›Paper›PMID 40619953›Full record

ArticleBrain and behavior2025

Exploring the Therapeutic Effects of Psychedelics Administered to Military Veterans in Naturalistic Retreat Settings.

Megan Calnan, Grace Blest-Hopley, Chris Busch, Milly Adams, Simon G D Ruffell, Theodore Piper, Leor Roseman, Hannes Kettner, Robin Carhart-Harris

Abstract read
In one paragraph

Article in Brain and behavior, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

1 citing paper in PubMed.

  1. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Megan CalnanCentre for Clinical Brain Sciences, Division of Psychiatry, University of Edinburgh, Edinburgh, UK.ORCID https://orcid.org/0009-0002-3767-065X
Grace Blest-HopleyKing's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK.ORCID https://orcid.org/0009-0007-2074-4743
Chris BuschHealth Analytics Collaborative, Maryland, USA.
Milly AdamsDepartment of Medicine, Centre for Psychedelic Research, Imperial College London, London, UK.
Simon G D RuffellOnaya Science, Iqiuitos, Peru.
Theodore PiperBirmingham Law School, University of Birmingham, Birmingham, UK.
Leor RosemanDepartment of Psychology, University of Exeter, Exeter, UK.
Hannes KettnerDepartment of Medicine, Centre for Psychedelic Research, Imperial College London, London, UK.
Robin Carhart-HarrisDepartment of Medicine, Centre for Psychedelic Research, Imperial College London, London, UK.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundMilitary veterans are at risk of various mental health conditions, with profound implications for post-deployment quality of life. Current treatment options encounter high dropout rates and non-responsiveness, and overlook the importance of community building in veterans' holistic recovery. Preliminary research suggests psychedelics offer therapeutic benefits for depression and post-traumatic stress disorder (PTSD) in veterans. Integrating psychedelic therapies with a communal retreat setting could provide a more holistic framework for improving veterans' well-being.

objectivesTo evaluate the effects of psychedelic retreats on mental health and community reintegration in veterans.

methodsFifty-eight veterans attended psilocybin or ayahuasca retreats. Participants completed eight mental health questionnaires (e.g. PTSD Checklist, PCL-5; Patient Health Questionnaire, PHQ-9), and the Military to Civilian Questionnaire (M2C-Q) up to 4 weeks both pre- and post-retreat. Paired t-tests analyzed changes in outcome responses between time points, and gender and substance-specific analysis was conducted. Baseline scores were correlated with improvements in PCL-5 and PHQ-9 to investigate the relationship between initial symptom severity and percentage improvement following the retreat.

resultsSignificant improvements were found for all eight outcomes post-retreat, with the greatest percentage improvements found for depression (PHQ-9; 29.1%) and PTSD (PCL-5; 26.1%). Veterans attending psilocybin retreats showed greater improvements in seven out of eight outcomes, whereas ayahuasca retreats demonstrated greater improvements in PCL-5 scores for PTSD (ayahuasca: 26.4%; Psilocybin 24.8%). Male participants experienced greater improvements across all outcomes apart from the PCL-5 for PTSD (Male: 24.1%; Female: 32.1%). Higher baseline scores on the PCL-5 (PTSD) and PHQ-9 (depression), indicating worse initial mental health, correlated with greater outcome improvements.

conclusionsThis is the first study to investigate psychedelic retreats as a holistic therapy for veterans' mental health alongside community reintegration. Psilocybin and ayahuasca retreats significantly improved veterans' mental well-being, quality of life, PTSD, anxiety, depression, sleep, concussion, and post-deployment reintegration. Participants with more severe symptoms have the potential to benefit most from this intervention, with nuanced insight into improved outcomes based on gender and type of substance. Psychedelic retreats could provide a treatment framework to aid veterans' recovery by addressing psychological well-being, communal factors, and reintegration into civilian life.

Indexed as

HallucinogensPsilocybinStress Disorders, Post-TraumaticVeteransAdultBanisteriopsisDepressionFemaleHumansMaleMiddle AgedQuality of LifeSurveys and QuestionnairesTreatment OutcomeHallucinogensPsilocybinayahuascamilitarypsilocybinpsychedelicsPTSDretreatsveterans

Identifiers

PMID40619953
PMCPMC12230355

What OpenQuestion holds

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LicenceCC BY
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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.