Drug interactions
Pimozide + Ritlecitinib
Severity: Major
Pimozide and Ritlecitinib: 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 is a sensitive CYP3A4 substrate with a narrow therapeutic window and dose-dependent QT prolongation. If ritlecitinib increases its exposure, the risk of QT prolongation and torsades de pointes could rise.
What this interaction means in plain words
Pimozide and Ritlecitinib 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; Ritlecitinib belongs to Oncology.
Why it happens
Ritlecitinib may inhibit CYP3A4, reducing pimozide metabolism and raising plasma concentrations.
What to do
Avoid the combination if possible. If used, obtain a baseline and follow-up ECG and use the lowest effective pimozide dose.
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 Ritlecitinib
Frequently asked questions
Can I take Pimozide with Ritlecitinib?
MediHelp rates the interaction as major. Pimozide and Ritlecitinib 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 is a sensitive CYP3A4 substrate with a narrow therapeutic window and dose-dependent QT prolongation. If ritlecitinib increases its exposure, the risk of QT prolongation and torsades de pointes could rise.
How serious is the interaction between Pimozide and Ritlecitinib?
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 if possible. If used, obtain a baseline and follow-up ECG and use the lowest effective pimozide dose.
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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