Dangerous Drug Interactions with Ayahuasca

Why Ayahuasca Interacts With Medications

Ayahuasca is typically made from two plants: the Banisteriopsis caapi vine and the leaves of Psychotria viridis (chacruna) or a similar DMT-containing plant. The vine contains harmine, harmaline, and tetrahydroharmine — all of which are potent monoamine oxidase inhibitors (MAOIs).

Monoamine oxidase is an enzyme your body uses to break down neurotransmitters like serotonin, dopamine, and norepinephrine. When you inhibit this enzyme with the MAOIs in ayahuasca, these neurotransmitters accumulate in your system. Under normal circumstances, this is what allows the DMT in the brew to become orally active.

The danger arises when you already have elevated levels of these neurotransmitters — either because of a medication you're taking or a substance you've consumed. The combination can push neurotransmitter levels to toxic and potentially fatal thresholds.

Critical-Risk Medications (Life-Threatening)

The following categories of medication pose the highest risk when combined with ayahuasca. In many documented cases, these combinations have resulted in hospitalization or death.

SSRIs (Selective Serotonin Reuptake Inhibitors)

SSRIs are among the most commonly prescribed antidepressants worldwide. They work by preventing the reabsorption of serotonin, keeping levels elevated in the brain. When combined with the MAOIs in ayahuasca, serotonin can accumulate to life-threatening levels — a condition called serotonin syndrome.

SNRIs (Serotonin-Norepinephrine Reuptake Inhibitors)

SNRIs affect both serotonin and norepinephrine, creating a dual risk profile when combined with MAOIs. The serotonin risk is comparable to SSRIs, with the added danger of norepinephrine-related hypertensive crisis.

MAOIs (Monoamine Oxidase Inhibitors)

Taking pharmaceutical MAOIs on top of the MAOIs already present in ayahuasca creates an extreme risk of hypertensive crisis and serotonin toxicity. This combination is one of the most dangerous.

Tricyclic Antidepressants (TCAs)

TCAs increase levels of serotonin and norepinephrine. Their interaction with MAOIs is well-documented in pharmacology and considered highly dangerous. Some TCAs also have anticholinergic effects that can compound adverse reactions.

High-Risk Medications & Substances

Stimulant Medications

Stimulants increase norepinephrine and dopamine. Combined with MAOIs, they can cause dangerous spikes in blood pressure and heart rate. ADHD medications fall into this category.

Opioid Pain Medications

Certain opioids — particularly tramadol and meperidine — have serotonergic activity that creates a dangerous interaction with MAOIs. Other opioids may also pose risks through altered metabolism and respiratory depression.

Migraine Medications (Triptans)

Triptans are serotonin receptor agonists. They directly increase serotonergic activity, creating risk of serotonin syndrome when combined with the MAOIs in ayahuasca.

Moderate-Risk Medications

These medications carry risk that should be evaluated on a case-by-case basis with your doctor. "Moderate" does not mean "safe" — it means the interaction is less well-documented or varies significantly by individual.

Understanding Serotonin Syndrome

Serotonin syndrome occurs when there is too much serotonergic activity in the nervous system. It can range from mild (tremor, diarrhea, agitation) to life-threatening (high fever, seizures, cardiovascular collapse). Onset is typically rapid — within minutes to hours of the triggering combination.

Symptoms to Watch For

Mild to moderate: Agitation, restlessness, rapid heart rate, dilated pupils, muscle twitching, heavy sweating, diarrhea, and shivering.

Severe (seek emergency care immediately): High fever (above 38.5°C / 101.3°F), seizures, irregular heartbeat, unconsciousness, and rigid muscles.

Medication Washout Periods

If you and your doctor decide to taper off a medication before an ayahuasca ceremony, the following are minimum recommended washout periods — the time between your last dose and when it is generally considered safe. These are guidelines, not guarantees, and individual variation can be significant.

Recreational Substances & Ayahuasca

Recreational drugs also interact with MAOIs. Even substances considered "natural" or "mild" can pose serious risks.

Supplements & Herbal Products

Several common supplements have serotonergic or stimulant properties that can interact with MAOIs. Because supplements are often poorly regulated, concentrations of active compounds can vary widely between products.

What You Should Do

If you are considering an ayahuasca ceremony and take any medication, supplement, or recreational substance, the path forward is straightforward:

First, make a complete list of everything you take — prescribed medications, over-the-counter drugs, supplements, herbal products, and recreational substances. Include dosages and how long you've been taking each one.

Second, consult your doctor. Show them this list and tell them you are considering participating in a ceremony involving a brew that contains MAOIs (harmine, harmaline, tetrahydroharmine). Ask about safe tapering timelines if appropriate, and whether participation is advisable given your medical history.

Third, share this information with the retreat center. Any reputable center will have a medical screening process. If they don't ask about your medications, that is a serious red flag. If they tell you your medications "don't matter" or to "just stop taking them," find a different center.

For a broader overview of ayahuasca safety in Colombia, including how to evaluate retreat centers and what to expect during ceremony, read our Complete Safety Guide.