Drug interactions
Oxybutynin + Trifluoperazine
Severity: Moderate
Oxybutynin and Trifluoperazine: 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
Trifluoperazine has mild anticholinergic activity, so combination with oxybutynin may add to antimuscarinic effects such as dry mouth, constipation and confusion. Altered gastrointestinal motility might also affect absorption of the oral antipsychotic, though this is poorly established.
What this interaction means in plain words
Oxybutynin and Trifluoperazine 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 effects, with possible delayed gastrointestinal absorption.
What to do
Monitor for anticholinergic effects and for loss of antipsychotic response, adjusting doses as needed.
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 Oxybutynin and Trifluoperazine, 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 Oxybutynin
Frequently asked questions
Can I take Oxybutynin with Trifluoperazine?
MediHelp rates the interaction as moderate. Oxybutynin and Trifluoperazine 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. Trifluoperazine has mild anticholinergic activity, so combination with oxybutynin may add to antimuscarinic effects such as dry mouth, constipation and confusion. Altered gastrointestinal motility might also affect absorption of the oral antipsychotic, though this is poorly established.
How serious is the interaction between Oxybutynin and Trifluoperazine?
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 effects and for loss of antipsychotic response, adjusting doses as needed.
What other medicines interact with Oxybutynin?
MediHelp also lists interactions of Oxybutynin with, for example, Bethanechol, Clozapine, Potassium chloride. The full list is on the Oxybutynin 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.
