Drug interactions
Tiotropium + Trospium
Severity: Moderate
Tiotropium 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
Tiotropium is an inhaled long-acting antimuscarinic with low systemic exposure, but combined with trospium it may add to systemic antimuscarinic effects. Dry mouth, constipation, urinary retention and tachycardia may be more likely.
What this interaction means in plain words
Tiotropium 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.
Tiotropium belongs to Respiratory; Trospium belongs to Genitourinary.
Why it happens
Additive muscarinic receptor antagonism.
What to do
Monitor for urinary retention, constipation and dry mouth. Reassess the need for both agents if symptoms occur.
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 Tiotropium
Frequently asked questions
Can I take Tiotropium with Trospium?
MediHelp rates the interaction as moderate. Tiotropium 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. Tiotropium is an inhaled long-acting antimuscarinic with low systemic exposure, but combined with trospium it may add to systemic antimuscarinic effects. Dry mouth, constipation, urinary retention and tachycardia may be more likely.
How serious is the interaction between Tiotropium 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 urinary retention, constipation and dry mouth. Reassess the need for both agents if symptoms occur.
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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