Drug interactions
Haloperidol + Methylenedioxymethamphetamine
Severity: Major
Haloperidol and Methylenedioxymethamphetamine: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
MDMA is a stimulant with serotonergic effects that raises heart rate, blood pressure and body temperature, and haloperidol adds QT risk and may alter the response. Together they increase the risk of arrhythmia, hyperthermia and neuroleptic malignant syndrome or serotonin toxicity.
What this interaction means in plain words
Haloperidol and Methylenedioxymethamphetamine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Opposing and additive monoamine effects, with MDMA CYP2D6 inhibition and haloperidol dopamine blockade and QT prolongation.
What to do
Advise patients to avoid MDMA. Provide ECG and temperature monitoring and supportive care in any exposure.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Haloperidol
- Dofetilide + Haloperidol Contraindicated
- Dronedarone + Haloperidol Contraindicated
- Haloperidol + Ibutilide Contraindicated
- Haloperidol + Levoketoconazole Contraindicated
- Haloperidol + Panobinostat Contraindicated
- Haloperidol + Pimozide Contraindicated
Frequently asked questions
Can I take Haloperidol with Methylenedioxymethamphetamine?
MediHelp rates the interaction as major. Haloperidol and Methylenedioxymethamphetamine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. MDMA is a stimulant with serotonergic effects that raises heart rate, blood pressure and body temperature, and haloperidol adds QT risk and may alter the response. Together they increase the risk of arrhythmia, hyperthermia and neuroleptic malignant syndrome or serotonin toxicity.
How serious is the interaction between Haloperidol and Methylenedioxymethamphetamine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise patients to avoid MDMA. Provide ECG and temperature monitoring and supportive care in any exposure.
What other medicines interact with Haloperidol?
MediHelp also lists interactions of Haloperidol with, for example, Dofetilide, Dronedarone, Ibutilide. The full list is on the Haloperidol page.
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