Drug interactions
Belladonna alkaloids + Trospium
Severity: Moderate
Belladonna alkaloids 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
Belladonna alkaloids such as atropine and hyoscyamine are antimuscarinics and add to trospium's effects. This may cause dry mouth, constipation, urinary retention, tachycardia and confusion.
What this interaction means in plain words
Belladonna alkaloids 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.
Why it happens
Additive antimuscarinic effects.
What to do
Avoid duplicate antimuscarinic therapy where possible. If both are needed, monitor for urinary retention, constipation and tachycardia.
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
Frequently asked questions
Can I take Belladonna alkaloids with Trospium?
MediHelp rates the interaction as moderate. Belladonna alkaloids 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. Belladonna alkaloids such as atropine and hyoscyamine are antimuscarinics and add to trospium's effects. This may cause dry mouth, constipation, urinary retention, tachycardia and confusion.
How serious is the interaction between Belladonna alkaloids 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: Avoid duplicate antimuscarinic therapy where possible. If both are needed, monitor for urinary retention, constipation and tachycardia.
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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