NutriStack
MDMA and Venlafaxine, contraindicated.
MDMA releases large amounts of serotonin and norepinephrine through monoamine transporters, while venlafaxine blocks serotonin and norepinephrine reuptake. The combination can be unpredictable: venlafaxine may blunt desired MDMA effects, which can prompt redosing, while MDMA still drives hyperthermia, hypertension, seizures, and serotonin syndrome risk. Reported MDMA-associated serotonin syndrome cases commonly involve other serotonergic substances.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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At a glance
- Substances
- MDMA and Venlafaxine
- Pair type
- Contraindicated
- Evidence (highest tier)
- Moderate
- Source citations
- 3 sources
- Stack Score effect
- −25 to your Stack Score (per scored contraindication row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Contraindicated · Moderate evidence
Contraindicated
What is happening. MDMA releases large amounts of serotonin and norepinephrine through monoamine transporters, while venlafaxine blocks serotonin and norepinephrine reuptake. The combination can be unpredictable: venlafaxine may blunt desired MDMA effects, which can prompt redosing, while MDMA still drives hyperthermia, hypertension, seizures, and serotonin syndrome risk. Reported MDMA-associated serotonin syndrome cases commonly involve other serotonergic substances.
Mechanism. MDMA enters neurons through SERT, NET, and DAT and promotes reverse transport of monoamines, especially serotonin. Venlafaxine inhibits SERT and NET, creating transporter competition plus additive serotonergic and adrenergic stress.
Recommendation. Do not use MDMA while taking venlafaxine. Do not try to overcome a blunted MDMA effect by taking more; that raises toxicity risk. If exposure occurs and you develop high fever, agitation, confusion, clonus, chest pain, or severe headache, seek emergency care.
Sources (3)
- Makunts T, Jerome L, Abagyan R, de Boer A. Reported Cases of Serotonin Syndrome in MDMA Users in FAERS Database. Front Psychiatry. 2021;12:824288. PMID 35140642
- Sarparast A, Thomas K, Malcolm B, Stauffer CS. Drug-drug interactions between psychiatric medications and MDMA or psilocybin: a systematic review. Psychopharmacology (Berl). 2022;239(6):1945-1976. PMID 35253070
- Green AR, Mechan AO, Elliott JM, O'Shea E, Colado MI. The pharmacology and clinical pharmacology of 3,4-methylenedioxymethamphetamine (MDMA, "ecstasy"). Pharmacol Rev. 2003;55(3):463-508. PMID 12869661
Stack Score
How this pair moves the number.
Effect on the composite score
If both MDMA and Venlafaxine are in the same stack, this pair applies −25 to your Stack Score (per scored contraindication row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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