Drug interactions
Gemtuzumab + Pimozide
Severity: Major
Gemtuzumab 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
Gemtuzumab ozogamicin has been associated with QT prolongation, and pimozide itself prolongs the QT interval substantially. Used together they may raise the risk of torsades de pointes, especially with electrolyte disturbances from chemotherapy.
What this interaction means in plain words
Gemtuzumab 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.
Why it happens
Additive QT-interval prolongation.
What to do
Check ECG and electrolytes at baseline and during treatment, and keep potassium and magnesium in normal range. Consider an alternative to pimozide during gemtuzumab therapy.
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
Frequently asked questions
Can I take Gemtuzumab with Pimozide?
MediHelp rates the interaction as major. Gemtuzumab 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. Gemtuzumab ozogamicin has been associated with QT prolongation, and pimozide itself prolongs the QT interval substantially. Used together they may raise the risk of torsades de pointes, especially with electrolyte disturbances from chemotherapy.
How serious is the interaction between Gemtuzumab 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: Check ECG and electrolytes at baseline and during treatment, and keep potassium and magnesium in normal range. Consider an alternative to pimozide during gemtuzumab therapy.
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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