Drug interactions
Pimozide + Quetiapine
Severity: Major
Pimozide and Quetiapine: 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
Both drugs prolong the QT interval and block dopamine receptors, so combined use raises the risk of torsades de pointes, extrapyramidal symptoms, sedation and neuroleptic malignant syndrome. Pimozide is a particularly high-risk QT agent.
What this interaction means in plain words
Pimozide and Quetiapine 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 belongs to Central Nervous System; Quetiapine belongs to Central Nervous System.
Why it happens
Additive QT prolongation, D2 antagonism and sedation.
What to do
Avoid the combination where possible. If used, obtain a baseline and follow-up ECG, correct potassium and magnesium, and monitor for extrapyramidal symptoms.
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 Pimozide
- Adagrasib + Pimozide Contraindicated
- Amiodarone + Pimozide Contraindicated
- Amisulpride + Pimozide Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amoxapine + Pimozide Contraindicated
- Anagrelide + Pimozide Contraindicated
Other interactions of Quetiapine
- Adagrasib + Quetiapine Major
- Amiodarone + Quetiapine Major
- Amisulpride + Quetiapine Major
- Amoxapine + Quetiapine Major
- Anagrelide + Quetiapine Major
- Apalutamide + Quetiapine Major
Frequently asked questions
Can I take Pimozide with Quetiapine?
MediHelp rates the interaction as major. Pimozide and Quetiapine 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. Both drugs prolong the QT interval and block dopamine receptors, so combined use raises the risk of torsades de pointes, extrapyramidal symptoms, sedation and neuroleptic malignant syndrome. Pimozide is a particularly high-risk QT agent.
How serious is the interaction between Pimozide and Quetiapine?
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, correct potassium and magnesium, and monitor for extrapyramidal symptoms.
What other medicines interact with Pimozide?
MediHelp also lists interactions of Pimozide with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Pimozide page.
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