Who should avoid ayahuasca?

The most repeated follow-up question Google shows under every ayahuasca search is this one, and it deserves a blunter answer than most retreat websites give it. Some people should not drink ayahuasca at all. Not with a better shaman, not with a smaller group, not after more preparation.

Antidepressants and MAOIs: the interaction that can kill

Ayahuasca is not just a psychedelic tea. The vine's harmala alkaloids are potent monoamine oxidase inhibitors, which is what makes the brew work, and it is also what makes it dangerous alongside serotonergic medication. Pharmacology literature going back to Callaway and Grob's 1998 paper warns that combining ayahuasca with SSRI antidepressants may induce a serotonin syndrome with a potentially grave outcome, and recent research describes the combination as synergistic serotonergic signaling that raises that risk. Confirmed clinical cases are rare, but this is the harm-reduction consensus, and it is the reason SSRIs, SNRIs and MAOIs top every serious contraindication list.

Two things follow from this. First, honest centers ask about medication before anything else, and guidance derived from ICEERS puts the washout period at two to six weeks or more off SSRIs or SNRIs, always under medical supervision. Second, and this cannot be said strongly enough: never stop or taper a psychiatric medication on your own to attend a retreat. That decision belongs to you and the doctor who prescribed it, on the prescriber's timeline, not a retreat calendar. The MAOI content also means tyramine-rich foods interact with the brew, which is one origin of the strict pre-retreat diet.

Psychiatric history: psychosis, schizophrenia, bipolar disorder

ICEERS, the specialist NGO whose safety materials the most careful centers build on, does not recommend ayahuasca for people prone to psychosis, diagnosed with schizophrenia or bipolar disorder, or with a family history of psychosis. This is not gatekeeping for its own sake. The US Embassy in Peru has noted mental-health episodes among the ayahuasca-linked incidents involving American citizens in remote Amazon areas, and a ceremony room hours from a hospital is the worst possible place to find out how a vulnerable mind responds to a powerful psychoactive.

Family history matters here even if you have never had symptoms yourself. If psychosis or bipolar disorder runs in your family, say so on every intake form and raise it with your doctor first.

Heart conditions and pregnancy

Ayahuasca raises blood pressure and heart rate. ICEERS lists serious cardiovascular conditions, including coronary disease, heart failure and stroke history, as contraindications for that reason. Pregnancy appears on the published contraindication lists of screening-focused centers alongside epilepsy and antipsychotic use, and no reputable center will knowingly serve a pregnant guest.

What real screening looks like

The screening a center runs before you arrive tells you how seriously it takes everything above. The strictest process documented in our research belongs to Temple of the Way of Light: a medical and psychological questionnaire developed with ICEERS, covering medications, cardiovascular risk and trauma, reviewed by a licensed doctor and a psychologist. Smaller centers do less but the good ones still ask: AyaSelva states that every guest completes a confidential health questionnaire plus a personal intake call, and its published list covers SSRIs, MAOIs, antipsychotics, heart disease, epilepsy, psychosis history and pregnancy.

A center that takes your booking without asking a single health question has answered your safety question for you. Our safety page walks through the full vetting checklist, and what happens at a retreat shows where screening fits in the whole arc. Unsure how any of this applies to you? Ask us and we will answer honestly, including when the honest answer is do not go.

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