Short answer: Ayahuasca is a psychedelic brew from the Amazon, usually made from Banisteriopsis caapi vine and Psychotria viridis leaves. The vine contains MAO inhibitors that let the leaves' DMT work when swallowed. DMT is Schedule I, though two churches have legal exemptions, and combining ayahuasca with antidepressants or stimulants can be fatal.
Key takeaways
- What it is: Ayahuasca is a psychedelic brew (DMT with mao inhibitors) and a Schedule I controlled substance in the US.
- Medical use: None approved.
- Timing: effects start in 30 to 60 minutes and last 4 to 6 hours.
- Most dangerous mix: SSRIs, SNRIs, tramadol, MDMA, St. John's wort, which can cause serotonin syndrome.
- Naloxone: it does not reverse this drug, but give it whenever opioids could be involved.
- Dependence risk: Low.
- Legal route: none. Schedule I substances cannot be prescribed.
What is ayahuasca?
Ayahuasca has been used for centuries by Indigenous peoples of the Amazon basin in healing and spiritual ceremonies. Today it is also used in syncretic churches and at retreats worldwide.
Effects include intense visions, emotional and spiritual experiences, altered sense of time and self, and a fast heartbeat and higher blood pressure. Vomiting and diarrhea are common and are considered part of the ceremony.
Quick facts
| Fact | Ayahuasca |
|---|---|
| Ingredients | Banisteriopsis caapi vine (harmine, harmaline, tetrahydroharmine) and DMT-containing leaves, usually Psychotria viridis |
| Drug class | Psychedelic (DMT) with reversible MAO-A inhibitors |
| US legal status | DMT is Schedule I; religious exemptions for the UDV and Santo Daime churches |
| Typical setting | Ceremonies led by a curandero or church, often at retreats |
| Onset | 30 to 60 minutes |
| Duration | 4 to 6 hours |
| Common effects | Vomiting and diarrhea ('purging'), intense visions |
How long does ayahuasca last?
- Starts working: 30 to 60 minutes
- Effects last: 4 to 6 hours
Timing varies with the dose, the form, how it is taken, liver and kidney function, age, and other drugs taken at the same time.
What are the biggest risks of ayahuasca?
Dangerous interactions: because of its MAO inhibitors, ayahuasca with SSRIs, SNRIs, MDMA, tramadol, stimulants, or tyramine-rich foods can cause serotonin syndrome or a hypertensive crisis.
Heart: raised heart rate and blood pressure can be dangerous with heart disease.
Mental health: distressing experiences, and, in people with personal or family history of psychosis or bipolar disorder, triggering of those conditions.
Warning: Never take ayahuasca while using SSRIs, SNRIs, MAO inhibitors, lithium, stimulants, or MDMA. Antidepressants usually need to be stopped for weeks, only under a prescriber's supervision.
What should you never mix with ayahuasca?
| Combined with | What happens | Guidance |
|---|---|---|
| SSRIs, SNRIs, tramadol, MDMA, St. John's wort | Serotonin syndrome | Dangerous |
| Stimulants and decongestants | Hypertensive crisis | Dangerous |
| Tyramine-rich foods (aged cheese, cured meats) | Raised blood pressure | Avoid |
| Lithium | Seizures | Dangerous |
| Other psychedelics | Unpredictable, intense effects | High risk |
Check any combination with the DoseUses combination checker or ask a pharmacist.
What are the signs of an ayahuasca overdose, and what should you do?
Serious toxicity mainly results from interactions: serotonin syndrome (agitation, fever, muscle twitching, rapid heartbeat) or a hypertensive crisis (severe headache, chest pain). Both need emergency care.
If someone is having a dangerous reaction
- Call 911 for a seizure, chest pain, a very high temperature, trouble breathing, unresponsiveness, or if the person may harm themselves or others.
- Move them to a quiet, safe place away from roads, water, heights, and crowds. Stay with them and speak calmly.
- Do not leave the person alone and do not give them other drugs or alcohol to calm them down.
- If they become unresponsive, place them on their side and give naloxone in case opioids are involved.
Is Ayahuasca addictive?
Ayahuasca is not considered physically addictive and does not cause a withdrawal syndrome. Tolerance builds quickly with repeated use.
- Hours to daysAfterglow or come-downTiredness, emotional sensitivity, or low mood can follow.
- Days to weeksIntegrationSome people have lingering anxiety or distressing memories that benefit from support.
- Rarely, monthsPersisting effectsA small number of people have lasting perception changes (HPPD) or mental health problems.
See the withdrawal timelines and the full ayahuasca withdrawal guide.
Is ayahuasca legal?
Ayahuasca contains DMT, a Schedule I controlled substance, so importing, possessing, or distributing it is illegal under federal law.
- Religious exemption: in Gonzales v. O Centro Espirita Beneficente Uniao do Vegetal (2006), the Supreme Court allowed the UDV church to use hoasca under the Religious Freedom Restoration Act. Santo Daime churches won a similar ruling in Oregon in 2009.
- Possession: outside these exemptions, a first federal conviction for possessing a controlled substance can bring up to one year in prison.
Outside the United States
| Country | Status |
|---|---|
| Peru | Traditional use protected as national cultural heritage (2008) |
| Brazil | Legal for religious use |
| United Kingdom | Illegal; DMT is Class A |
| International | DMT is in Schedule I of the 1971 Convention; the plants themselves are not listed |
Frequently asked questions about ayahuasca
Is ayahuasca legal in the US?
Generally no, because it contains DMT, but two churches have court-recognized religious exemptions.
Can you take ayahuasca on antidepressants?
No. The combination can cause serotonin syndrome. Any change to antidepressants must be planned with a prescriber.
Why does ayahuasca make you vomit?
The harmala alkaloids and the brew itself commonly cause vomiting and diarrhea, called purging in ceremonies.
Is ayahuasca the same as DMT?
It contains DMT, but its MAO inhibitors make it last hours instead of minutes and add interaction risks.
Are ayahuasca retreats safe?
Risks vary widely. Look for medical screening, trained staff, and clear emergency plans, and avoid retreats that add other substances.
Sources
- Psychedelic and Dissociative Drugs, National Institute on Drug Abuse.
- Controlled Substance Schedules, DEA Diversion Control Division.
- Gonzales v. O Centro Espirita Beneficente Uniao do Vegetal, 546 U.S. 418 (2006), Legal Information Institute, Cornell Law School.
- 21 U.S.C. 844, Penalties for simple possession, Legal Information Institute, Cornell Law School.
- National Helpline, Substance Abuse and Mental Health Services Administration.
- FindTreatment.gov, Substance Abuse and Mental Health Services Administration.
- International drug control conventions, United Nations Office on Drugs and Crime.
This guide summarizes the sourced DoseUses Ayahuasca profile, written from FDA labels, DEA rules, and federal health agencies. It is educational and is not medical advice. Last updated October 5, 2026.
