Drug interactions
Bethanechol + Darifenacin
Severity: Major
Bethanechol and Darifenacin: major 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
Darifenacin is a selective M3 muscarinic antagonist and directly opposes the bladder-stimulating action of bethanechol. The two drugs have opposite therapeutic goals and cancel each other's effect.
What this interaction means in plain words
Bethanechol and Darifenacin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Bethanechol belongs to Gastrointestinal Tract; Darifenacin belongs to Genitourinary.
Why it happens
Competitive M3 receptor antagonism by darifenacin against bethanechol agonism.
What to do
Avoid combining; reassess the indication and use only one of the two agents.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Bethanechol
- Bethanechol + Fesoterodine Major
- Bethanechol + Oxybutynin Major
- Bethanechol + Physostigmine Major
- Amifampridine + Bethanechol Moderate
- Amitriptyline + Bethanechol Moderate
- Amoxapine + Bethanechol Moderate
Other interactions of Darifenacin
Frequently asked questions
Can I take Bethanechol with Darifenacin?
MediHelp rates the interaction as major. Bethanechol and Darifenacin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Darifenacin is a selective M3 muscarinic antagonist and directly opposes the bladder-stimulating action of bethanechol. The two drugs have opposite therapeutic goals and cancel each other's effect.
How serious is the interaction between Bethanechol and Darifenacin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining; reassess the indication and use only one of the two agents.
What other medicines interact with Bethanechol?
MediHelp also lists interactions of Bethanechol with, for example, Fesoterodine, Oxybutynin, Physostigmine. The full list is on the Bethanechol page.
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