Drug interactions
Chlorpromazine + Trospium
Severity: Moderate
Chlorpromazine 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
Both drugs have antimuscarinic activity, so taking them together can add to anticholinergic effects such as dry mouth, constipation, urinary retention, blurred vision, confusion and tachycardia. Older or frail patients are at particular risk of delirium and heat intolerance.
What this interaction means in plain words
Chlorpromazine 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.
Chlorpromazine belongs to Central Nervous System; Trospium belongs to Genitourinary.
Why it happens
Additive peripheral and central antimuscarinic effects from trospium and the anticholinergic activity of chlorpromazine.
What to do
Monitor for anticholinergic toxicity, especially constipation, urinary retention and cognitive change, and consider a lower trospium dose or an alternative bladder agent if symptoms occur. Avoid in patients with narrow-angle glaucoma or significant urinary or bowel obstruction.
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 Chlorpromazine
- Chlorpromazine + Dofetilide Contraindicated
- Chlorpromazine + Dronedarone Contraindicated
- Chlorpromazine + Droperidol Contraindicated
- Chlorpromazine + Ibutilide Contraindicated
- Chlorpromazine + Metrizamide Contraindicated
- Chlorpromazine + Panobinostat Contraindicated
Frequently asked questions
Can I take Chlorpromazine with Trospium?
MediHelp rates the interaction as moderate. Chlorpromazine 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. Both drugs have antimuscarinic activity, so taking them together can add to anticholinergic effects such as dry mouth, constipation, urinary retention, blurred vision, confusion and tachycardia. Older or frail patients are at particular risk of delirium and heat intolerance.
How serious is the interaction between Chlorpromazine 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 toxicity, especially constipation, urinary retention and cognitive change, and consider a lower trospium dose or an alternative bladder agent if symptoms occur. Avoid in patients with narrow-angle glaucoma or significant urinary or bowel obstruction.
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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