Drug interactions
Tiotropium + Trospium chloride
Severity: Moderate
Tiotropium and Trospium chloride: 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 are antimuscarinics, so combining them increases anticholinergic effects such as dry mouth, constipation, urinary retention and blurred vision. Trospium is a quaternary amine that does not cross the blood-brain barrier well, so central effects are less likely.
What this interaction means in plain words
Tiotropium and Trospium chloride 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 muscarinic receptor antagonism.
What to do
Monitor for urinary retention, constipation and ocular symptoms. Avoid in patients with narrow-angle glaucoma or significant urinary 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 Tiotropium
Frequently asked questions
Can I take Tiotropium with Trospium chloride?
MediHelp rates the interaction as moderate. Tiotropium and Trospium chloride 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 are antimuscarinics, so combining them increases anticholinergic effects such as dry mouth, constipation, urinary retention and blurred vision. Trospium is a quaternary amine that does not cross the blood-brain barrier well, so central effects are less likely.
How serious is the interaction between Tiotropium and Trospium chloride?
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 urinary retention, constipation and ocular symptoms. Avoid in patients with narrow-angle glaucoma or significant urinary obstruction.
What other medicines interact with Tiotropium?
MediHelp also lists interactions of Tiotropium with, for example, Glycopyrrolate inhaled, Indacaterol-glycopyrronium, Revefenacin. The full list is on the Tiotropium page.
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