Drug interactions
Pimozide + Talquetamab
Severity: Major
Pimozide and Talquetamab: 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
Talquetamab causes cytokine release that can temporarily suppress CYP enzyme activity. This may raise pimozide concentrations and increase the risk of QT prolongation and arrhythmia, particularly during step-up dosing and any cytokine release syndrome.
What this interaction means in plain words
Pimozide and Talquetamab 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; Talquetamab belongs to Oncology.
Why it happens
Cytokine-mediated suppression of CYP3A4 reduces pimozide metabolism.
What to do
Avoid pimozide, or consider an alternative, during talquetamab step-up and for about two weeks after the first full dose. If it must be used, monitor ECG and for signs of pimozide toxicity and reduce the dose as needed.
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 Talquetamab
- Clozapine + Talquetamab Major
- Bendamustine + Talquetamab Moderate
- Carbamazepine + Talquetamab Moderate
- Clomipramine + Talquetamab Moderate
- Colchicine + Talquetamab Moderate
- Cyclosporin + Talquetamab Moderate
Frequently asked questions
Can I take Pimozide with Talquetamab?
MediHelp rates the interaction as major. Pimozide and Talquetamab 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. Talquetamab causes cytokine release that can temporarily suppress CYP enzyme activity. This may raise pimozide concentrations and increase the risk of QT prolongation and arrhythmia, particularly during step-up dosing and any cytokine release syndrome.
How serious is the interaction between Pimozide and Talquetamab?
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 pimozide, or consider an alternative, during talquetamab step-up and for about two weeks after the first full dose. If it must be used, monitor ECG and for signs of pimozide toxicity and reduce the dose as needed.
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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