Responsible Ceremonial Medicine: A Review of Current Evidence, Safety Protocols, and Ethical Considerations for Professional Practice
Zenodo (CERN European Organization for Nuclear Research) April 3, 2026 Peer reviewed DOI: 10.5281/zenodo.19392796 via OpenAlex
Summary
The article reviews clinical evidence for psilocybin and ayahuasca as treatments for major and treatment-resistant depression, analyzing data from over 134 clinical trials. It discusses neurobiological mechanisms like neuroplasticity and adult neurogenesis, safety profiles based on systematic reviews, and ethical considerations in practice. The authors advocate for a three-phase model of preparation, experience, and integration as the minimum standard for responsible use of these psychedelics in therapy.
Study at a glance
| Design | systematic review |
|---|---|
| Population | clinical trials related to psilocybin and ayahuasca |
| Key finding | The article argues that the three-phase model (preparation, experience, integration) constitutes the minimum professional standard for responsible ceremonial medicine practice. |
Abstract
This article reviews the current clinical evidence for psilocybin and ayahuasca as therapeutic agents, examining data from over 134 registered clinical trials and key publications in the New England Journal of Medicine, JAMA, JAMA Psychiatry, and Nature Neuroscience. The review addresses four dimensions: (1) the state of clinical evidence for psilocybin and ayahuasca in major depression and treatment-resistant depression, including landmark trials by Goodwin et al. (2022), Davis et al. (2021), Raison et al. (2023), and Palhano-Fontes et al. (2019); (2) neurobiological mechanisms underlying therapeutic effects, particularly psychedelic-induced neuroplasticity via BDNF receptor TrkB binding (Moliner et al., 2023) and DMT-regulated adult neurogenesis (Morales-García et al., 2020); (3) the safety profile based on systematic review evidence (Freitas et al., 2025) and established safety guidelines (Johnson, Richards & Griffiths, 2008); and (4) ethical and cultural considerations for professional practice involving plant-based psychedelic compounds. The article argues that the three-phase model (preparation, experience, integration) documented in leading clinical trials constitutes the minimum professional standard for responsible ceremonial medicine practice. Written from the perspective of a licensed clinical psychologist and certified Psychedelic Assisted Therapist practicing in Costa Rica.