Drug interactions
Carbachol + Fesoterodine
Severity: Minor
Carbachol and Fesoterodine: minor 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
Carbachol is a cholinergic agonist and fesoterodine an antimuscarinic, so they pharmacologically oppose one another and may reduce the effect of each. Systemic exposure from ophthalmic carbachol is typically small.
What this interaction means in plain words
Carbachol and Fesoterodine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Carbachol belongs to Miscellaneous; Fesoterodine belongs to Genitourinary.
Why it happens
Pharmacodynamic antagonism at muscarinic receptors.
What to do
Monitor for reduced effect of either drug; no routine adjustment is needed.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Fesoterodine
Other interactions of Carbachol
- Atropine + Carbachol Moderate
- Bethanechol + Carbachol Moderate
- Carbachol + Darifenacin Moderate
- Carbachol + Dicyclomine Moderate
- Carbachol + Donepezil Moderate
- Carbachol + Flavoxate Moderate
Frequently asked questions
Can I take Carbachol with Fesoterodine?
MediHelp rates the interaction as minor. Carbachol and Fesoterodine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Carbachol is a cholinergic agonist and fesoterodine an antimuscarinic, so they pharmacologically oppose one another and may reduce the effect of each. Systemic exposure from ophthalmic carbachol is typically small.
How serious is the interaction between Carbachol and Fesoterodine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for reduced effect of either drug; no routine adjustment is needed.
What other medicines interact with Fesoterodine?
MediHelp also lists interactions of Fesoterodine with, for example, Bethanechol, Clozapine, Levoketoconazole. The full list is on the Fesoterodine page.
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