Drug interactions
Darifenacin + Oxybutynin transdermal
Severity: Moderate
Darifenacin and Oxybutynin transdermal: 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 drugs are bladder antimuscarinics, so combining them duplicates therapy and adds anticholinergic adverse effects. Systemic levels from the patch are lower than with oral oxybutynin but still contribute.
What this interaction means in plain words
Darifenacin and Oxybutynin transdermal 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 using two antimuscarinics for overactive bladder unless specialist-directed; monitor for dry mouth, constipation, retention, and cognitive effects.
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 Darifenacin
Frequently asked questions
Can I take Darifenacin with Oxybutynin transdermal?
MediHelp rates the interaction as moderate. Darifenacin and Oxybutynin transdermal 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 drugs are bladder antimuscarinics, so combining them duplicates therapy and adds anticholinergic adverse effects. Systemic levels from the patch are lower than with oral oxybutynin but still contribute.
How serious is the interaction between Darifenacin and Oxybutynin transdermal?
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 using two antimuscarinics for overactive bladder unless specialist-directed; monitor for dry mouth, constipation, retention, and cognitive effects.
What other medicines interact with Darifenacin?
MediHelp also lists interactions of Darifenacin with, for example, Atazanavir, Bethanechol, Clarithromycin. The full list is on the Darifenacin page.
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