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Critical Risk: Risk of serotonin syndrome and hypertensive crisis
Synapedia classifies this as a critical red-flag context. Acute symptoms require urgent medical help. This page can provide source-linked orientation, but it is not medical advice, a dosing guide or a claim that the combination can be made safe.
MAO inhibitors block the enzymatic breakdown of serotonin, dopamine and noradrenaline. MDMA releases large amounts of serotonin and also increases dopamine and noradrenaline. Combined, this can lead to uncontrolled accumulation of these neurotransmitters, with the risk of life-threatening serotonin syndrome (high fever, muscle rigidity, autonomic instability) and hypertensive crisis. This is one of the best-documented potentially fatal substance interactions.
Mechanism data is language-neutral pharmacological notation. It does not provide amounts, timing or instructions for combining substances.
Pair-specific warning signs have not yet been curated. Breathing problems, loss of consciousness, seizures, chest pain, high fever, collapse or severe confusion remain medical red flags.
If acute symptoms appear, seek emergency medical help. Do not wait when breathing, consciousness, seizures, chest pain or severe confusion are involved.
MAO inhibitors block the enzymatic breakdown of serotonin, dopamine and noradrenaline. MDMA releases large amounts of serotonin and also increases dopamine and noradrenaline. Combined, this can lead to uncontrolled accumulation of these neurotransmitters, with the risk of life-threatening serotonin syndrome (high fever, muscle rigidity, autonomic instability) and hypertensive crisis. This is one of the best-documented potentially fatal substance interactions.
MAO-Hemmung blockiert den enzymatischen Serotoninabbau + SERT-Umkehrtransport (MDMA) setzt massiv Serotonin frei = unkontrollierte Serotoninakkumulation
Important red flags include breathing problems, loss of consciousness, seizures, chest pain, high fever, collapse or severe confusion. Acute symptoms require medical help and this page does not replace emergency care.
This entry includes class-based pharmacology and should not be read as an individual clinical assessment. The page links 2 sources.
This page is based on curated pharmacological data and/or community signals. It is intended for scientific education and harm reduction only. It does not replace professional medical advice. Not all interactions are covered — always consult a healthcare professional when in doubt. In emergencies, call your local emergency number.