Drug interactions
Oxybutynin transdermal + Solifenacin
Severity: Moderate
Oxybutynin transdermal and Solifenacin: 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 to anticholinergic effects including dry mouth, constipation, urinary retention and cognitive impairment. Transdermal delivery gives less dry mouth than oral oxybutynin, but systemic effects still add.
What this interaction means in plain words
Oxybutynin transdermal and Solifenacin 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 antagonism at muscarinic receptors.
What to do
Avoid therapeutic duplication; if combined, monitor for anticholinergic adverse effects and post-void residual and stop one agent if they 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 Solifenacin
Frequently asked questions
Can I take Oxybutynin transdermal with Solifenacin?
MediHelp rates the interaction as moderate. Oxybutynin transdermal and Solifenacin 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 to anticholinergic effects including dry mouth, constipation, urinary retention and cognitive impairment. Transdermal delivery gives less dry mouth than oral oxybutynin, but systemic effects still add.
How serious is the interaction between Oxybutynin transdermal and Solifenacin?
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; if combined, monitor for anticholinergic adverse effects and post-void residual and stop one agent if they occur.
What other medicines interact with Solifenacin?
MediHelp also lists interactions of Solifenacin with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Solifenacin page.
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