Drug interactions
Oxybutynin transdermal + Tolterodine
Severity: Moderate
Oxybutynin transdermal and Tolterodine: 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 used for overactive bladder, so using them together adds little benefit and increases anticholinergic adverse effects. Dry mouth, constipation, urinary retention and cognitive effects are more likely, although transdermal delivery produces less metabolite than oral oxybutynin.
What this interaction means in plain words
Oxybutynin transdermal and Tolterodine 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
Avoid therapeutic duplication and use a single agent. If combined, monitor for anticholinergic toxicity and post-void residual.
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 Tolterodine
Frequently asked questions
Can I take Oxybutynin transdermal with Tolterodine?
MediHelp rates the interaction as moderate. Oxybutynin transdermal and Tolterodine 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 used for overactive bladder, so using them together adds little benefit and increases anticholinergic adverse effects. Dry mouth, constipation, urinary retention and cognitive effects are more likely, although transdermal delivery produces less metabolite than oral oxybutynin.
How serious is the interaction between Oxybutynin transdermal and Tolterodine?
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 therapeutic duplication and use a single agent. If combined, monitor for anticholinergic toxicity and post-void residual.
What other medicines interact with Tolterodine?
MediHelp also lists interactions of Tolterodine with, for example, Clarithromycin, Clozapine, Cobicistat. The full list is on the Tolterodine page.
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