Drug interactions
Pimozide + Trospium
Severity: Moderate
Pimozide and Trospium: moderate 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 has some anticholinergic activity, so combining it with trospium adds to antimuscarinic adverse effects like dry mouth, constipation and urinary retention. Trospium has no meaningful QT effect, but pimozide carries a QT risk that should still be considered in the overall regimen.
What this interaction means in plain words
Pimozide and Trospium can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Pimozide belongs to Central Nervous System; Trospium belongs to Genitourinary.
Why it happens
Additive antimuscarinic pharmacodynamic effects.
What to do
Monitor for anticholinergic effects and cognition. Continue the usual ECG and electrolyte monitoring that pimozide requires.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Trospium
- Clozapine + Trospium Major
- Pramlintide + Trospium Major
- Thioridazine + Trospium Major
- Trihexyphenidyl + Trospium Major
- Aclidinium + Trospium Moderate
- Amantadine + Trospium Moderate
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 Pimozide with Trospium?
MediHelp rates the interaction as moderate. Pimozide and Trospium can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Pimozide has some anticholinergic activity, so combining it with trospium adds to antimuscarinic adverse effects like dry mouth, constipation and urinary retention. Trospium has no meaningful QT effect, but pimozide carries a QT risk that should still be considered in the overall regimen.
How serious is the interaction between Pimozide and Trospium?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for anticholinergic effects and cognition. Continue the usual ECG and electrolyte monitoring that pimozide requires.
What other medicines interact with Trospium?
MediHelp also lists interactions of Trospium with, for example, Clozapine, Pramlintide, Thioridazine. The full list is on the Trospium page.
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