Drug interactions
Clozapine + Oxybutynin transdermal
Severity: Moderate
Clozapine 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 anticholinergic, so additive effects such as constipation, urinary retention, dry mouth, tachycardia and confusion can occur. Clozapine-associated gastrointestinal hypomotility can progress to serious complications, although transdermal oxybutynin gives lower systemic exposure than oral forms.
What this interaction means in plain words
Clozapine 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 antimuscarinic pharmacodynamic effects.
What to do
Monitor bowel function and anticholinergic symptoms, and treat constipation proactively. Consider a non-anticholinergic option for bladder symptoms if effects emerge.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Clozapine and Oxybutynin transdermal, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Clozapine
- Clozapine + Deferiprone Contraindicated
- Clozapine + Irinotecan Contraindicated
- Clozapine + Pimozide Contraindicated
- Clozapine + Thioridazine Contraindicated
- Acalabrutinib + Clozapine Major
- Adagrasib + Clozapine Major
Frequently asked questions
Can I take Clozapine with Oxybutynin transdermal?
MediHelp rates the interaction as moderate. Clozapine 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 anticholinergic, so additive effects such as constipation, urinary retention, dry mouth, tachycardia and confusion can occur. Clozapine-associated gastrointestinal hypomotility can progress to serious complications, although transdermal oxybutynin gives lower systemic exposure than oral forms.
How serious is the interaction between Clozapine 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: Monitor bowel function and anticholinergic symptoms, and treat constipation proactively. Consider a non-anticholinergic option for bladder symptoms if effects emerge.
What other medicines interact with Clozapine?
MediHelp also lists interactions of Clozapine with, for example, Deferiprone, Irinotecan, Pimozide. The full list is on the Clozapine page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
