Drug interactions
Quetiapine + Trospium
Severity: Moderate
Quetiapine 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
Quetiapine, through its metabolite norquetiapine, has appreciable muscarinic blocking activity, so it adds to the antimuscarinic effects of trospium. Constipation, dry mouth, urinary retention, sedation and confusion may be more likely.
What this interaction means in plain words
Quetiapine 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.
Quetiapine 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, especially in older patients. Reduce doses or choose alternatives if bowel or bladder problems develop.
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 Quetiapine
- Adagrasib + Quetiapine Major
- Amiodarone + Quetiapine Major
- Amisulpride + Quetiapine Major
- Amoxapine + Quetiapine Major
- Anagrelide + Quetiapine Major
- Apalutamide + Quetiapine Major
Frequently asked questions
Can I take Quetiapine with Trospium?
MediHelp rates the interaction as moderate. Quetiapine 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. Quetiapine, through its metabolite norquetiapine, has appreciable muscarinic blocking activity, so it adds to the antimuscarinic effects of trospium. Constipation, dry mouth, urinary retention, sedation and confusion may be more likely.
How serious is the interaction between Quetiapine 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, especially in older patients. Reduce doses or choose alternatives if bowel or bladder problems develop.
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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