NutriStack
Duloxetine and MDMA, contraindicated.
Duloxetine directly interferes with MDMA pharmacology at serotonin and norepinephrine transporters. In a controlled human study, duloxetine reduced MDMA's subjective and physiologic effects, which can encourage unsafe redosing, while MDMA exposure and serotonergic load remain clinically concerning. The combination can raise risk for serotonin syndrome, hyperthermia, hypertension, arrhythmia, and seizures.
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
- Duloxetine and MDMA
- 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. Duloxetine directly interferes with MDMA pharmacology at serotonin and norepinephrine transporters. In a controlled human study, duloxetine reduced MDMA's subjective and physiologic effects, which can encourage unsafe redosing, while MDMA exposure and serotonergic load remain clinically concerning. The combination can raise risk for serotonin syndrome, hyperthermia, hypertension, arrhythmia, and seizures.
Mechanism. MDMA depends on SERT and NET to enter monoamine neurons and drive reverse serotonin and norepinephrine transport. Duloxetine inhibits SERT and NET and can inhibit CYP2D6, altering MDMA pharmacodynamics and potentially its exposure.
Recommendation. Do not use MDMA while taking duloxetine. Do not increase MDMA doses to overcome duloxetine-related blunting. Seek emergency care for high fever, severe agitation, confusion, clonus, chest pain, fainting, or severe headache after exposure.
Sources (3)
- Hysek CM, Simmler LD, Nicola VG, et al. Duloxetine inhibits effects of MDMA ("ecstasy") in vitro and in humans in a randomized placebo-controlled laboratory study. PLoS One. 2012;7(5):e36476. PMID 22574166
- 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
- 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
Stack Score
How this pair moves the number.
Effect on the composite score
If both Duloxetine and MDMA 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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