Drug interactions
Oxybutynin transdermal + Tiotropium
Severity: Moderate
Oxybutynin transdermal and Tiotropium: 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
Transdermal oxybutynin is systemically absorbed and adds antimuscarinic effects to tiotropium. This can cause dry mouth, constipation, urinary retention and blurred vision. Transdermal delivery gives fewer anticholinergic effects than oral oxybutynin.
What this interaction means in plain words
Oxybutynin transdermal and Tiotropium 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 anticholinergic adverse effects, especially in older adults and those with glaucoma or urinary retention. Consider an alternative to the antimuscarinic if symptoms appear.
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 Oxybutynin transdermal with Tiotropium?
MediHelp rates the interaction as moderate. Oxybutynin transdermal and Tiotropium 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. Transdermal oxybutynin is systemically absorbed and adds antimuscarinic effects to tiotropium. This can cause dry mouth, constipation, urinary retention and blurred vision. Transdermal delivery gives fewer anticholinergic effects than oral oxybutynin.
How serious is the interaction between Oxybutynin transdermal and Tiotropium?
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 adverse effects, especially in older adults and those with glaucoma or urinary retention. Consider an alternative to the antimuscarinic if symptoms appear.
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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