Drug interactions
Oxybutynin + Protriptyline
Severity: Moderate
Oxybutynin and Protriptyline: 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
Protriptyline is a tricyclic antidepressant with strong antimuscarinic effects, so combined use with oxybutynin can cause marked dry mouth, constipation, urinary retention, tachycardia and confusion. Older patients are at greater risk of delirium.
What this interaction means in plain words
Oxybutynin and Protriptyline 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.
What to do
Monitor for anticholinergic toxicity and consider an alternative with less antimuscarinic activity, especially in elderly patients.
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 Oxybutynin
Frequently asked questions
Can I take Oxybutynin with Protriptyline?
MediHelp rates the interaction as moderate. Oxybutynin and Protriptyline 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. Protriptyline is a tricyclic antidepressant with strong antimuscarinic effects, so combined use with oxybutynin can cause marked dry mouth, constipation, urinary retention, tachycardia and confusion. Older patients are at greater risk of delirium.
How serious is the interaction between Oxybutynin and Protriptyline?
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 toxicity and consider an alternative with less antimuscarinic activity, especially in elderly patients.
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.
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