If you are taking an antidepressant and considering ayahuasca, this is the single most important thing to understand before anything else. It is more important than which retreat you choose, what the ceremony is like, or what you hope to get from it.
Ayahuasca is not one plant. It is a combination, and half of that combination is a monoamine oxidase inhibitor.
Why the brew works, and why that creates risk
The Banisteriopsis caapi vine contains harmine, harmaline, and tetrahydroharmine, which inhibit an enzyme called monoamine oxidase. The leaf added to the brew, chacruna in Peru or chagra in much of Colombia, contains DMT.
DMT taken orally on its own is broken down in the digestive tract and has essentially no effect. The MAO inhibition in the vine is what allows it to become active. That is the entire pharmacological logic of the brew, and it is elegant.
It also means that drinking ayahuasca temporarily changes how your body processes a whole category of substances, including several classes of psychiatric medication.
Serotonin syndrome
Combining an MAOI with a serotonergic drug can produce serotonin syndrome, a condition caused by excessive serotonin activity. Presentations range from mild to life threatening.
Features can include agitation, confusion, rapid heart rate, elevated blood pressure, high body temperature, muscle rigidity, tremor, heavy sweating, and in severe cases seizures. Severe serotonin syndrome is a medical emergency and can be fatal.
This is not a theoretical concern raised for liability reasons. It is the reason every credible Ayahuasca Retreat asks for a complete medication list during screening, and the reason a retreat that does not ask should be ruled out immediately.
What interacts
The list is longer than most people expect and includes medications people often do not think of as psychiatric.
SSRIs, including fluoxetine, sertraline, escitalopram, citalopram, and paroxetine.
SNRIs, including venlafaxine and duloxetine.
MAOIs, including phenelzine, tranylcypromine, and selegiline.
Tricyclic antidepressants, including amitriptyline and nortriptyline.
Lithium, which warrants particular caution and is widely treated as a firm contraindication.
Tramadol, and certain other opioids.
Triptans used for migraine.
Dextromethorphan, found in many over the counter cough preparations.
Stimulants, including prescribed amphetamines and methylphenidate.
St John’s wort, 5-HTP, and several other supplements marketed as mood support. Being sold without a prescription does not make something pharmacologically inert.
Certain antipsychotics and buspirone, depending on the specific agent.
Recreational substances in the serotonergic category, including MDMA and cocaine, carry serious risk in this context as well.
If you take anything at all, including supplements, it goes on the list you give the retreat. Leaving something off does not protect your privacy in any way that matters, and centers like MahaDevi use that list to decide whether to accept you at all.
Washout periods
Stopping is not immediate. Medications clear at different rates, and the relevant figure is not when you took your last dose but when the drug and its active metabolites are actually out of your system.
Fluoxetine is the clearest example. Its active metabolite has a long half life, and washout guidance for fluoxetine is commonly measured in weeks rather than days, considerably longer than for most other SSRIs. Other agents clear faster. MAOIs require their own extended interval.
Any specific number you read online, including anything implied here, is a general figure and not a plan. The actual interval depends on the drug, the dose, how long you have taken it, and your own metabolism, and it is a question for the person who prescribed it.
The part people underestimate
The pharmacology is only half the problem. The other half is that antidepressants are treating something.
Coming off medication means the underlying depression or anxiety may return, and discontinuation itself produces symptoms with several agents. Someone who tapers quickly in order to make a retreat date can arrive in the Amazon in worse psychological condition than they have been in for years, having removed the thing that was holding them steady, in an unfamiliar country, about to participate in a demanding experience.
That is a genuinely bad combination, and it happens because a deposit was paid and a date was set.
If a taper is appropriate, it is planned around your stability rather than around a booking. Sometimes the honest answer from a prescriber is that now is not the time, and postponing is the right call.
What this means practically
Talk to your prescriber first, before booking anything. Not after. The timeline may make a particular date impossible.
Never taper on your own. This applies to the pharmacology and to the psychiatric risk equally.
Disclose everything to the retreat, including supplements and anything taken occasionally.
Build in margin. A washout that finishes the day before you fly leaves no room for the taper to go badly, and tapers frequently need to be slowed.
Accept that the answer may be no. Some medications, some conditions, and some situations make ayahuasca inadvisable regardless of how much someone wants to go. A retreat that accepts everyone is not screening.
What good screening looks like
Comprehensive medical and psychiatric screening before acceptance, not after payment. Specific questions about medications, cardiovascular conditions, seizure history, liver function, and personal or family history of psychosis or bipolar disorder. A willingness to decline applicants. Preparation support with enough lead time that a taper can be managed properly rather than rushed.
MahaDevi requires full medical and psychiatric screening before any participant is accepted, with structured preparation in the weeks beforehand. Any retreat worth attending will have an equivalent process, and the ones that do not are the ones to walk away from.
The short version
Do not stop an antidepressant to attend a retreat without your prescriber managing it. Do not assume a two week gap is sufficient. Do not leave anything off the medication list. And do not let a booked date drive a medical decision.
The medicine will still be there next year. The interaction risk is not something you can prepare your way around.
This article is general information and not medical advice. Decisions about psychiatric medication must be made with the clinician who prescribes it.
If you are struggling while tapering or at any point afterward, contact your prescriber. In the US, call or text 988 to reach the Suicide and Crisis Lifeline, available 24/7.
