Drug interactions
Oxybutynin transdermal + Thioridazine
Severity: Moderate
Oxybutynin transdermal and Thioridazine: 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 agents have antimuscarinic activity, so combined use may add to dry mouth, constipation, urinary retention, blurred vision and confusion. Transdermal oxybutynin gives lower systemic exposure than oral, so the effect is generally modest.
What this interaction means in plain words
Oxybutynin transdermal and Thioridazine 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 anticholinergic effects.
What to do
Monitor for anticholinergic adverse effects, especially in older adults and those with cognitive impairment. Reduce the dose or stop oxybutynin if symptoms develop.
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 Thioridazine
- Abiraterone + Thioridazine Contraindicated
- Adagrasib + Thioridazine Contraindicated
- Amiodarone + Thioridazine Contraindicated
- Amisulpride + Thioridazine Contraindicated
- Amitriptyline + Thioridazine Contraindicated
- Amoxapine + Thioridazine Contraindicated
Frequently asked questions
Can I take Oxybutynin transdermal with Thioridazine?
MediHelp rates the interaction as moderate. Oxybutynin transdermal and Thioridazine 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 agents have antimuscarinic activity, so combined use may add to dry mouth, constipation, urinary retention, blurred vision and confusion. Transdermal oxybutynin gives lower systemic exposure than oral, so the effect is generally modest.
How serious is the interaction between Oxybutynin transdermal and Thioridazine?
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 cognitive impairment. Reduce the dose or stop oxybutynin if symptoms develop.
What other medicines interact with Thioridazine?
MediHelp also lists interactions of Thioridazine with, for example, Abiraterone, Adagrasib, Amiodarone. The full list is on the Thioridazine page.
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