Four people died after taking MDMA with an MAOI antidepressant they had bought to make the ecstasy stronger
Finnish forensic report: "Four deaths following the ingestion of moclobemide and MDMA ('ecstasy') are described. The probable cause of death in each case was serotonin syndrome as a result of an interaction between the two drugs."
Weak or heavily disputed. Treat as a question, not an answer. how we score evidence
Caveat on this rating: Four forensic cases; "probable cause" is the authors' judgement from toxicology and circumstances. A case series cannot give a rate, and moclobemide is not the MAOI US patients take.
This is the case series that turns "MAOIs and MDMA" from pharmacology into a warning.
Significant findings
Vuori and colleagues (Addiction, 2003), from the Finnish forensic toxicology service, reported: "Four deaths following the ingestion of moclobemide and MDMA ('ecstasy') are described. The probable cause of death in each case was serotonin syndrome as a result of an interaction between the two drugs."
Why the combination happened: "As none of the victims had been prescribed moclobemide it seems that each had taken the drug to enhance the effects of MDMA, with fatal consequences. Warnings are needed against misinformed attempts to potentiate the pharmacological effects of illicit drugs."
Moclobemide is a reversible MAOI antidepressant sold in Europe. The irreversible MAOIs available in the US, phenelzine and tranylcypromine, block the same enzyme for longer. The tranylcypromine label in this wave lists amphetamines, of which MDMA is one, as contraindicated.
Worth asking
The people in this report were not patients on an antidepressant who happened to take ecstasy. They took an MAOI deliberately, on the theory that blocking serotonin breakdown would make MDMA stronger. It did. Serotonin syndrome is the mechanism working as described, and the Hunter criteria row in the interactions wave lists the signs: twitching, agitation, sweating, tremor, overactive reflexes, then rigidity and fever. If you take an MAOI for depression, MDMA is not a risk to weigh; it is the combination that killed these four.
Source
Death following ingestion of MDMA (ecstasy) and moclobemide — Vuori E, Henry JA, Ojanperä I, Nieminen R, Savolainen T, Wahlsten P, Jäntti M (2003)
Reputable peer-reviewed journal
Read the source: https://doi.org/10.1046/j.1360-0443.2003.00292.x
DOI: 10.1046/j.1360-0443.2003.00292.x
How this was scored
- Study design
- Case series or case report
- Funding
- Funding not disclosed
- Published in
- Reputable peer-reviewed journal
- Sample size
- 4
- Preregistered
- not recorded
- Conflicts disclosed
- not recorded
- Independent of proponent
- not recorded
- Retracted
- No
Read the full scoring rubric, including what it can't tell you.
Published September 21, 2026.
Questions
How strong is the evidence behind this?
veisund rates this source "contested". Weak or heavily disputed. Treat as a question, not an answer. It scores 32 out of 100 on our published rubric. One caveat travels with that badge: Four forensic cases; "probable cause" is the authors' judgement from toxicology and circumstances. A case series cannot give a rate, and moclobemide is not the MAOI US patients take. The score is calculated from recorded facts about the source — study design, funding, publication venue, sample size, preregistration — not typed in by an editor.
What is the source for this?
Death following ingestion of MDMA (ecstasy) and moclobemide — Vuori E, Henry JA, Ojanperä I, Nieminen R, Savolainen T, Wahlsten P, Jäntti M (2003). Published in: Reputable peer-reviewed journal. DOI: 10.1046/j.1360-0443.2003.00292.x. The full source is linked on this page so you can read it yourself.
Who paid for this research, and does that matter?
Study design: Case series or case report. Funding: Funding not disclosed. Independence from the proponent is not recorded. Industry sponsorship is one of the most reliably measured biases in medicine, which is why funding carries real weight in the score rather than sitting in a footnote.
Is this medical advice?
This is information to bring to your prescriber, not medical advice and not a reason to change anything on your own. Nothing here is an instruction to stop or reduce a medication. If you are in crisis, call or text 988.
This is information to bring to your prescriber, not medical advice and not a reason to change anything on your own. Nothing here is an instruction to stop or reduce a medication. If you are in crisis, call or text 988.