Drug interactions
Bethanechol + Oxybutynin transdermal
Severity: Moderate
Bethanechol 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
Oxybutynin is an antimuscarinic that reduces bladder contractility, which is the opposite of bethanechol's purpose. The two drugs have pharmacologically opposing actions on the detrusor muscle, though transdermal delivery gives lower systemic levels.
What this interaction means in plain words
Bethanechol 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
Muscarinic antagonism by oxybutynin opposes bethanechol agonism.
What to do
Avoid using these together for the same bladder indication. If both are given, monitor bladder emptying and residual urine.
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 Bethanechol
- Bethanechol + Darifenacin Major
- Bethanechol + Fesoterodine Major
- Bethanechol + Oxybutynin Major
- Bethanechol + Physostigmine Major
- Amifampridine + Bethanechol Moderate
- Amitriptyline + Bethanechol Moderate
Frequently asked questions
Can I take Bethanechol with Oxybutynin transdermal?
MediHelp rates the interaction as moderate. Bethanechol 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. Oxybutynin is an antimuscarinic that reduces bladder contractility, which is the opposite of bethanechol's purpose. The two drugs have pharmacologically opposing actions on the detrusor muscle, though transdermal delivery gives lower systemic levels.
How serious is the interaction between Bethanechol 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: Avoid using these together for the same bladder indication. If both are given, monitor bladder emptying and residual urine.
What other medicines interact with Bethanechol?
MediHelp also lists interactions of Bethanechol with, for example, Darifenacin, Fesoterodine, Oxybutynin. The full list is on the Bethanechol page.
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