What ayahuasca risks and screening questions should you understand?

What medical screening should a good ayahuasca retreat do?

A good ayahuasca retreat should screen every applicant for mental and physical health conditions before confirming a booking. Clinical trials set the benchmark: researchers excluded people with current medical disease, pregnancy, neurological disorders, personal or family history of schizophrenia, bipolar disorder, mania or hypomania, substance abuse and suicidal risk.

• Psychiatric history: personal or family history of psychosis, schizophrenia, bipolar disorder, mania or hypomania. A published review recommends screening out exactly these applicants.
• Suicidality: the depression trials excluded anyone with suicidal risk.
• Medications: a complete list of prescription drugs, supplements and recreational substances. Serotonergic drugs such as SSRIs, MDMA and dextromethorphan, and stimulants such as amphetamines and cocaine, interact with ayahuasca.
• Cardiovascular: uncontrolled hypertension, cardiovascular and cerebrovascular disease, which appear on MAOI contraindication lists; ayahuasca can raise diastolic blood pressure.
• Physical health: pregnancy, neurological disorders, and severe liver and kidney impairment.
• Substance use: current substance abuse was a trial exclusion criterion.

The screening should be more than a form. ICEERS publishes a free health questionnaire (AyaSafe 2) that collects the medical history needed to identify contraindications, and a pre-interview guide (AyaSafe 3) for facilitators conducting assessments. Operators differ in what they publish: Soltara states a licensed psychologist reviews every application after a medical and psychological questionnaire and one-to-one intake call, Etnikas states it reviews all medical information before your visit, and Temple of the Way of Light screens for cardiovascular, liver or kidney disease, recent surgeries, psychiatric conditions and contraindicated medications. A retreat that accepts everyone who pays, or that tells you to stop medication without your prescribing clinician, is not doing this work. The Alcohol and Drug Foundation advises retreat participants to inform themselves about screening processes, emergency protocols, proximity to medical care and supervision arrangements.

Sources, checked November 15, 2026: Rapid antidepressant effects of the psychedelic ayahuasca in..., Ayahuasca: A review of historical, pharmacological, and therapeutic..., Ayahuasca and Dimethyltryptamine Adverse Events and Toxicity..., MAPS - MAOI Contraindications [related to Ayahuasca], Ayahuasca

Is ayahuasca safe, and who should not take it?

Research suggests ayahuasca is generally safe in a controlled, screened environment but is not risk-free, which is how Cleveland Clinic frames it. In the Global Ayahuasca Survey of more than 10,000 people, about 70 percent reported physical side effects but only 2.3 percent needed medical attention. A review concludes ayahuasca has a narrow safety margin and should be avoided by people with certain pre-existing mental conditions and by pregnant women.

• People with a personal or family history of psychosis or schizophrenia. The Alcohol and Drug Foundation states ayahuasca can trigger or worsen anxiety, schizophrenia or psychosis and anyone with such a history should avoid it.
• People with bipolar disorder or a history of mania. Clinical trials excluded personal or family history of bipolar disorder, mania or hypomania.
• People with cardiovascular disease or uncontrolled hypertension. MAOI contraindication lists include cardiovascular and cerebrovascular diseases.
• Pregnant women. The safety review concludes ayahuasca should be avoided in pregnancy, and trials excluded pregnancy.
• People with severe liver or kidney impairment, which appears on MAOI contraindication lists.
• Anyone taking SSRIs, MAOIs, MDMA, dextromethorphan or other serotonergic drugs, because of serotonin syndrome risk.

No one should stop prescribed medication on their own to attend a ceremony. Depression trials used an average two-week supervised washout before dosing, and abrupt discontinuation of SSRIs is warned against in retreat guidance. WebMD lists antidepressants, cough medicine, St. John's wort, weight loss drugs, triptans and Parkinson's medications as drugs not to combine with ayahuasca. Medication and diagnosis questions belong with a licensed clinician, not a retreat intake form.

Sources, checked November 15, 2026: Ayahuasca: What It Is and Risks, Ayahuasca and Dimethyltryptamine Adverse Events and Toxicity..., Ayahuasca - Alcohol and Drug Foundation, Rapid antidepressant effects of the psychedelic ayahuasca in..., Ayahuasca: A review of historical, pharmacological, and therapeutic...

Has anyone died at an ayahuasca retreat, and how common are serious problems?

Yes, deaths have occurred in connection with ayahuasca retreats, but ICEERS states that among 58 deaths worldwide linked to ayahuasca, not a single autopsy attributed a fatality to acute intoxication from the traditional brew of Banisteriopsis caapi and Psychotria viridis. The Alcohol and Drug Foundation reports deaths after ayahuasca use occurred mostly from suicide, mixing ayahuasca with other drugs, and drowning.

Two cautions apply. First, these survey figures are retrospective, self-reported and cannot establish a risk rate for any specific retreat. Second, combining ayahuasca with MDMA, mescaline, 2C compounds, bath salts, LSD, 5-MeO-DMT or psilocybin is flagged as high risk because fatalities have been reported in recreational settings. ICEERS estimates around four million ayahuasca consumers worldwide, of whom only 10 percent belong to Indigenous groups with traditional use, which puts the 58 reported deaths in context but does not make them a rate.

Sources, checked November 15, 2026: Ayahuasca, Global Consumption & Reported Deaths in the Media, Ayahuasca: A review of historical, pharmacological, and therapeutic..., Ayahuasca - Alcohol and Drug Foundation, Adverse effects of ayahuasca: Results from the Global Ayahuasca..., Ayahuasca and Dimethyltryptamine Adverse Events and Toxicity...

Why shouldn't you do ayahuasca?

You should not do ayahuasca if you have a personal or family history of psychosis, schizophrenia, bipolar disorder or mania, if you are pregnant, if you have cardiovascular disease or uncontrolled hypertension, or if you take antidepressants or other serotonergic drugs, because the brew's MAOIs combined with those medications can cause serotonin syndrome, which can be fatal. A review concludes ayahuasca should be avoided by people with certain pre-existing mental conditions and by pregnant women.

• Physical effects are near-universal: nausea, vomiting, diarrhea, and increases in blood pressure, heart rate and body temperature are listed by the Alcohol and Drug Foundation and Cleveland Clinic.
• Mental health after-effects are common: about 56% of Global Ayahuasca Survey respondents reported a negative impact on mental health in the days and weeks after use.
• The risk of harm is higher for people with depression, anxiety, psychosis or mania, and for those combining substances, per Cleveland Clinic.
• Combining ayahuasca with MDMA, mescaline, 2C compounds, bath salts, LSD, 5-MeO-DMT or psilocybin is high risk because fatalities have been reported.
• Unscreened settings carry risk: a review notes many Amazon retreat centers screen participants precisely to minimize harm during ceremonies.
• Never stop prescribed medication to attend. In research studies, patients underwent a washout period (2 weeks on average) adjusted to the half-life of the antidepressant in use.

None of this means harm is likely for every user. The survey authors concluded adverse effects are frequent but not generally severe, and most attendees continue attending ceremonies. But frequent, mostly tolerable effects and rare serious ones are both part of the record, and the U.S. Embassy in Lima issued a health alert on January 23, 2025 recommending that U.S. citizens not use ayahuasca in Peru, after reports of serious illness and deaths involving travelers. Check the official page directly, since guidance can change.

Sources, checked November 15, 2026: Health Alert: Do Not Use Ayahuasca/Kambo, U.S. Embassy Lima (January..., Ayahuasca - Alcohol and Drug Foundation, Ayahuasca and Dimethyltryptamine Adverse Events and Toxicity..., Ayahuasca preparations and serotonin reuptake inhibitors: a potential..., Ayahuasca: pharmacology, safety, and therapeutic effects - PMC

What questions should you ask a retreat about its screening?

Ask a retreat who reviews its medical intake and with what qualifications, what conditions and medications lead to exclusion, what the emergency protocol is, and how far the nearest hospital is. The Alcohol and Drug Foundation advises retreat participants to inform themselves about screening processes, brew preparation, emergency protocols, proximity to medical care and supervision arrangements before committing.

• Who reviews the intake? Soltara states a licensed psychologist reviews every application after a medical and psychological questionnaire and a one-to-one intake call. Etnikas states it takes time and care reviewing all medical information before a visit. Ask for names and verifiable scope.
• What leads to exclusion? Published exclusion lists differ. Etnikas lists psychiatric diagnoses (schizoid, schizophrenic, bipolar and borderline personality disorders), active addiction to cocaine and amphetamines, and cardiovascular conditions including coronary heart disease, heart failure and congenital heart disease. Arkana excludes schizophrenia, bipolar disorder, severe heart disease and chronic high blood pressure. LaWayra does not recommend attendance for people with psychosis, schizophrenia, bipolar disorder or dissociative disorders.
• Does the retreat decline applicants? Soltara states every guest completes a questionnaire and intake call before a place is confirmed, but published claims of applicant rejection rates or refund guarantees should be asked about directly.
• What is the emergency plan? ICEERS publishes emergency-protocol material covering likely physical and psychological emergencies, ambulance guidelines, and a document for emergency medical personnel about ayahuasca, usable as a benchmark.
• What post-ceremony support exists if someone destabilizes? ICEERS states post-ceremony support reduces risks and helps prevent prolonged distress, isolation, or impulsive decisions.

Red flags are the inverse of these answers: instant booking with no questionnaire, no follow-up after a serious disclosure, blanket advice to stop medication without a prescriber, and no written emergency plan. A shaman's screening in one Colombian study did not allow participants on antidepressants or with a mental health disorder to take part, which is the standard of caution to expect anywhere.

Sources, checked November 15, 2026: Ayahuasca - Alcohol and Drug Foundation, Is Ayahuasca Legal in Costa Rica?, How Much Does an Ayahuasca Retreat Cost?, FAQ - Etnikas - Safe and authentic Ayahuasca retreats in Cusco Peru., Safety protocols - Etnikas - Safe and authentic Ayahuasca retreats in...

What are the physical side effects of ayahuasca?

Nausea and vomiting are the most common physical effects of ayahuasca, along with diarrhea, abdominal pain and headache. In a large survey, 69.9 percent of respondents reported acute physical adverse effects, primarily vomiting, and 2.3 percent reported needing medical attention. Survey numbers describe reported experiences rather than a rate for any specific retreat.

Sources: Ayahuasca: What It Is and Risks, Adverse effects of ayahuasca: Results from the Global Ayahuasca..., Ayahuasca: pharmacology, safety, and therapeutic effects - PMC, Ayahuasca: A review of historical, pharmacological, and therapeutic...

Can ayahuasca cause heart problems?

Ayahuasca produces moderate, transient increases in blood pressure and heart rate in controlled studies, and a large dose raised diastolic blood pressure by 9 mm Hg after 75 minutes. Cleveland Clinic notes that elevated heart rate and blood pressure raise concern for immediate cardiovascular harm. People with cardiovascular disease should discuss this with a cardiologist before considering attendance. One clinical trial recorded asymptomatic bradycardia and hypotension as its only serious adverse event.

Sources: Ayahuasca: pharmacology, safety, and therapeutic effects - PMC, Ayahuasca: A review of historical, pharmacological, and therapeutic..., Ayahuasca: What It Is and Risks, Ayahuasca and Dimethyltryptamine Adverse Events and Toxicity...

Can ayahuasca cause psychosis?

Psychotic reactions after ayahuasca or DMT have been documented, but a systematic review of case studies found they occurred only in people with current or prior psychiatric symptoms, a family history of psychosis, or concurrent use of other drugs such as cannabis. The Alcohol and Drug Foundation states ayahuasca can trigger or worsen anxiety, schizophrenia or psychosis and that anyone with a history of these should avoid it. A published case describes a patient treated successfully with antipsychotic medication after a psychotic episode following ayahuasca.

Clinical trial exclusion criteria reflect the same concern: researchers excluded applicants with a personal or family history of schizophrenia, bipolar disorder, mania or hypomania. If you have such a history, bring the question to a psychiatrist, not to a retreat's intake form.

Sources: Ayahuasca and Dimethyltryptamine Adverse Events and Toxicity..., Ayahuasca - Alcohol and Drug Foundation, Psychosis induced by abuse of ayahuasca: a case report., Rapid antidepressant effects of the psychedelic ayahuasca in...

Is ayahuasca safe for people with bipolar disorder?

The literature gives a specific warning for bipolar disorder. A case report describes a 30-year-old man with bipolar disorder who developed a manic episode after a four-day ayahuasca ritual in Brazil, was hospitalized, treated with risperidone and clonazepam, and discharged asymptomatic after one month. Before travel he had a ten-day hypomanic period. Screening that does not ask about personal and family history of mania is not addressing this documented risk.

Under DSM 5, a manic episode emerging during antidepressant treatment but persisting beyond its physiological effect is evidence of bipolar disorder type I, which is why researchers exclude people with mania history from trials. For anyone with bipolar disorder asking what could happen medically, only a psychiatrist can weigh this, and the case literature documents real harm.

Sources: Switch to mania after ayahuasca consumption in a man with bipolar..., Rapid antidepressant effects of the psychedelic ayahuasca in...

Can you take ayahuasca while on antidepressants?

Combining ayahuasca with medications that raise serotonin risks serotonin syndrome, which can range from mild to life-threatening. One review notes no clearly confirmed ayahuasca-related serotonin syndrome cases in the scientific literature, but the pharmacological risk stands. Harmala alkaloids are also metabolized by CYP2D6 and related enzymes, so drugs using the same pathways, including several antidepressants, can interact. In depression trials, patients stopped antidepressants after an average two-week washout under medical supervision before dosing. Never change or stop medication for a retreat without the prescribing clinician.

• Ask the prescriber, not the retreat, whether your specific medication interacts.
• Request the name and scope of whoever reviews your medication list at the retreat.
• Get any stopping interval in writing from a clinician qualified to give it.

Sources: Ayahuasca: What It Is and Risks, Ayahuasca: pharmacology, safety, and therapeutic effects - PMC, Ayahuasca and Dimethyltryptamine Adverse Events and Toxicity..., Rapid antidepressant effects of the psychedelic ayahuasca in...

Is ayahuasca bad for your brain?

Human studies reviewed to date do not show cognitive deficits from ayahuasca. A systematic review of 28 human studies found neither acute nor long-term use associated with increased psychopathology or cognitive deficits, and a one-year follow-up of ritual users found no signs of cognitive impairment. Imaging of long-term users shows structural differences, including changes in cingulate cortex thickness, which are findings, not established damage. Rat studies at 4X and 8X ritual doses caused some neural degeneration and deaths during treatment, but no permanent structural change was found in surviving animals. These findings do not clear any individual person for use.

Sources: Ayahuasca and Dimethyltryptamine Adverse Events and Toxicity..., Ayahuasca: Psychological and Physiologic Effects, Pharmacology and..., Ayahuasca: An ancient sacrament for treatment of contemporary...

Is ayahuasca safe during pregnancy?

The safety review concludes ayahuasca should be avoided by pregnant women, and clinical trial protocols exclude pregnancy as a standard criterion. A peer-reviewed article in the Journal of Psychoactive Drugs (2011) discusses medical and religious perspectives on ayahuasca consumption by children and pregnant women, and some Brazilian churches permit use, but that religious practice is not medical clearance. Questions about pregnancy, fertility or miscarriage belong with an obstetrician. This guide gives no trimester-specific guidance.

Sources: Ayahuasca and Dimethyltryptamine Adverse Events and Toxicity..., Rapid antidepressant effects of the psychedelic ayahuasca in..., Consumption of ayahuasca by children and pregnant women: medical...

How many deaths are associated with ayahuasca per year?

There is no reliable annual death count. A comprehensive report cited in the literature reviewed 58 deaths associated with ayahuasca and attributed none to acute intoxication from the classic two-plant brew. The Alcohol and Drug Foundation reports that deaths after ayahuasca use occurred mostly from suicide, mixing with other drugs, and drowning. Combinations with MDMA, mescaline, 2C compounds, bath salts, LSD, 5-MeO-DMT or psilocybin are flagged as high risk because fatalities have been reported. Any retreat that states death is impossible is going beyond what the record supports.

Sources: Ayahuasca: A review of historical, pharmacological, and therapeutic..., Ayahuasca - Alcohol and Drug Foundation, Ayahuasca: An ancient sacrament for treatment of contemporary...

What is ayahuasca used to treat?

No psychedelic substance is currently FDA approved for medical use, so ayahuasca is not an approved treatment for anything in the United States. Researchers are studying it for treatment-resistant depression, PTSD, substance-use disorder and eating disorders. A 2019 randomized placebo-controlled trial in 29 treatment-resistant depression patients found a 57 percent reduction in depression scores at seven days, with 64 percent remission versus 27 percent on placebo. A 2016 search of the literature found no randomized trials of ayahuasca for psychiatric illness at that time, and small open-label studies have limits. A retreat marketing ayahuasca as a treatment is ahead of the evidence.

Sources: A landscape analysis of psychedelic retreat organizations advertising..., Ayahuasca: What It Is and Risks, Ayahuasca: pharmacology, safety, and therapeutic effects - PMC, Long-term mental health and wellbeing outcomes associated with...

Are ayahuasca retreats safe?

No guide can declare a retreat safe. What the record shows is that screening matters and varies widely. A review notes many Amazon retreat centers screen participants for mental and physical conditions to reduce harm. ICEERS publishes emergency-protocol material covering likely physical and psychological emergencies, ambulance guidelines, and a document for emergency medical personnel about ayahuasca's characteristics. Use these as a benchmark for what a center should be able to describe in detail.

• Ask what the screening excludes and who reviews the answers.
• Ask for the center's emergency protocol and distance to the nearest hospital.
• Ask whether you can decline a dose, stop, or leave a ceremony without penalty.
• Check independent review platforms, since a center's own testimonials are selected by the center.

Sources: Ayahuasca: A review of historical, pharmacological, and therapeutic..., AyaSafe: Free Ayahuasca Safety Documents by ICEERS

What are the long-term effects of ayahuasca?

Reported long-term findings point in different directions. The Global Ayahuasca Survey found 55.9 percent of respondents reported adverse mental health effects in the weeks or months after use, with emotional-cognitive effects reported by 42.0 percent and altered perception effects by 38.3 percent, though most lasted under a week for seven of ten effect types. Observational studies of long-term ritual users found no increased psychiatric disorders or cognitive problems. The Alcohol and Drug Foundation states flashbacks are the most common long-term effect of psychedelic use. Long-term use has also been shown to produce changes in brain chemistry and personality. Retrospective surveys cannot predict your outcome.

Sources: Ayahuasca and Dimethyltryptamine Adverse Events and Toxicity..., Adverse effects of ayahuasca: Results from the Global Ayahuasca..., Ayahuasca: pharmacology, safety, and therapeutic effects - PMC, Ayahuasca - Alcohol and Drug Foundation

What does current official advice say?

The U.S. Department of State's Peru advisory recommends that visiting U.S. citizens not consume ayahuasca. It reports serious illness, deaths and other harms involving travelers. The linked official page should be checked directly because travel guidance can change. This publication does not override it.

ICEERS' safety factsheet describes physical and psychological risks and the relevance of personal circumstances and support. It is background information rather than individual clearance. An operator's confident language, comfortable setting or screening form does not resolve your own health questions.

Who conducts the assessment?

Request the name, qualifications and actual responsibilities of the professional who assesses medical and psychological concerns. Ask how their credentials can be verified and which jurisdiction and scope apply. Confirm whether they are present during the experience or provide a different service remotely.

The expression medical supervision is incomplete without those details. Ask what it means at the particular site and what it does not include. Keep the person selling a package separate from the person qualified to assess health questions.

What should be explained about boundaries and support?

Ask how consent is obtained, how concerns can be raised and which conduct rules apply. Find out how the provider addresses requests to decline participation, photography preferences and complaints. Request the actual arrangements for urgent help rather than infer them from a phrase such as support available.

How should individual health questions be raised?

Discuss relevant circumstances with qualified clinicians through the appropriate private channel. This page supplies no eligibility quiz, disease-specific advice, dosage guidance or medication changes. Do not use a general article to alter treatment or decide that participation is safe for you.

If an instruction is unclear, conflicts with your existing care or appears outside a person's qualifications, request clarification from the relevant professionals. You can defer a decision while a question remains unresolved. A price deadline should not determine how you handle a health concern.

What do adverse-effect studies establish?

The Global Ayahuasca Survey documents reported physical adverse effects and subsequent mental or emotional difficulties. Its retrospective, self-selected design describes respondents' reports; it cannot predict an individual session or establish a diagnosis from a percentage.

Keep acute reactions separate from later changes. The dedicated after-effects guide discusses that later time window. A provider's explanation that difficulty can carry personal meaning does not assess its medical significance. Bring concerning symptoms to qualified assessment rather than fitting them into an advertised growth story.

How should medication and supplement questions be handled?

Provide the relevant medication, supplement and substance history to the appropriately qualified professional reviewing your circumstances. Ask who owns that assessment and how to clarify a conflicting instruction. A general list on a website cannot account for the full history or establish an individual clearance.

This guide supplies no stopping interval, taper, substitute or permission to combine substances. A retreat's sales deadline should not determine a treatment change. The practical task is to involve the relevant clinicians and obtain an answer within their professional scope.

How should you read a retreat's safety statistics?

Providers and commentators sometimes quote percentages from the Global Ayahuasca Survey to suggest that harm is rare or that screening resolves concern. Those figures describe retrospective, self-selected reports from people who chose to respond to an online survey. They cannot establish an incidence rate for any particular program, and they cannot predict an individual session.

Three limits deserve attention. First, respondents recalled their own experiences, sometimes long afterward, so acute reactions and later difficulties may be reported unevenly. Second, the survey's respondents differ from the guests of any specific property in preparation, setting and health history, so a percentage from the survey group does not transfer to a booking decision. Third, the survey reports both physical adverse effects and subsequent mental or emotional difficulties; a quote that mentions only one category is incomplete.

A provider's use of statistics is best treated as a starting question: which figure, from which study, describing which group? If an operator claims its own record of safety, ask what records exist, who reviews them and what they measure. A count of ceremonies held is not a documented safety outcome. Concerning symptoms that arise in the weeks after an experience belong with qualified assessment, not with a favorable percentage. The dedicated after-effects guide discusses that later time window in detail.