Drug interactions
Methamphetamine + Pimozide
Severity: Major
Methamphetamine and Pimozide: 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
Pimozide blocks dopamine receptors and prolongs the QT interval, whereas methamphetamine stimulates dopamine release and raises heart rate. The drugs oppose each other's therapeutic effects, and the combined cardiac effects raise arrhythmia concern.
What this interaction means in plain words
Methamphetamine and Pimozide 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.
Methamphetamine belongs to Central Nervous System; Pimozide belongs to Central Nervous System.
Why it happens
Opposing dopaminergic pharmacodynamics plus additive cardiac effects including QT prolongation by pimozide.
What to do
Avoid the combination where possible; if used, obtain a baseline and follow-up ECG and monitor electrolytes. Reassess therapy if QTc lengthens or palpitations occur.
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 Methamphetamine
- Isocarboxazid + Methamphetamine Contraindicated
- Linezolid + Methamphetamine Contraindicated
- Methamphetamine + Phenelzine Contraindicated
- Methamphetamine + Procarbazine Contraindicated
- Methamphetamine + Rasagiline Contraindicated
- Methamphetamine + Safinamide Contraindicated
Other interactions of Pimozide
- Adagrasib + Pimozide Contraindicated
- Amiodarone + Pimozide Contraindicated
- Amisulpride + Pimozide Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amoxapine + Pimozide Contraindicated
- Anagrelide + Pimozide Contraindicated
Frequently asked questions
Can I take Methamphetamine with Pimozide?
MediHelp rates the interaction as major. Methamphetamine and Pimozide 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. Pimozide blocks dopamine receptors and prolongs the QT interval, whereas methamphetamine stimulates dopamine release and raises heart rate. The drugs oppose each other's therapeutic effects, and the combined cardiac effects raise arrhythmia concern.
How serious is the interaction between Methamphetamine and Pimozide?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination where possible; if used, obtain a baseline and follow-up ECG and monitor electrolytes. Reassess therapy if QTc lengthens or palpitations occur.
What other medicines interact with Methamphetamine?
MediHelp also lists interactions of Methamphetamine with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Methamphetamine page.
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