Drug interactions
Bethanechol + Carbachol
Severity: Moderate
Bethanechol and Carbachol: 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 are direct-acting muscarinic agonists, so concurrent systemic exposure can produce additive cholinergic effects such as bradycardia, hypotension, bronchospasm, sweating and cramping. Carbachol is mainly used ophthalmically with limited systemic absorption, which lowers the practical risk.
What this interaction means in plain words
Bethanechol and Carbachol 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.
Bethanechol belongs to Gastrointestinal Tract; Carbachol belongs to Miscellaneous.
Why it happens
Additive direct muscarinic receptor agonism.
What to do
Monitor for cholinergic symptoms, particularly in patients with asthma or cardiac disease. Reduce the bethanechol dose if adverse effects occur.
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
Other interactions of Carbachol
- Atropine + Carbachol Moderate
- Carbachol + Darifenacin Moderate
- Carbachol + Dicyclomine Moderate
- Carbachol + Donepezil Moderate
- Carbachol + Flavoxate Moderate
- Carbachol + Galantamine Moderate
Frequently asked questions
Can I take Bethanechol with Carbachol?
MediHelp rates the interaction as moderate. Bethanechol and Carbachol 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 are direct-acting muscarinic agonists, so concurrent systemic exposure can produce additive cholinergic effects such as bradycardia, hypotension, bronchospasm, sweating and cramping. Carbachol is mainly used ophthalmically with limited systemic absorption, which lowers the practical risk.
How serious is the interaction between Bethanechol and Carbachol?
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 cholinergic symptoms, particularly in patients with asthma or cardiac disease. Reduce the bethanechol dose if adverse effects occur.
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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