Drug interactions
Carbachol + Trospium
Severity: Minor
Carbachol and Trospium: 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 trospium is a muscarinic antagonist, so each may reduce the effect of the other. The significance depends on the route, as ophthalmic carbachol has little systemic exposure.
What this interaction means in plain words
Carbachol and Trospium 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; Trospium belongs to Genitourinary.
Why it happens
Pharmacodynamic antagonism at muscarinic receptors.
What to do
Monitor for reduced effect of carbachol, such as less miosis or bladder stimulation. No dose change is needed unless response is inadequate.
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 Trospium
- Clozapine + Trospium Major
- Pramlintide + Trospium Major
- Thioridazine + Trospium Major
- Trihexyphenidyl + Trospium Major
- Aclidinium + Trospium Moderate
- Amantadine + Trospium Moderate
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 Trospium?
MediHelp rates the interaction as minor. Carbachol and Trospium 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 trospium is a muscarinic antagonist, so each may reduce the effect of the other. The significance depends on the route, as ophthalmic carbachol has little systemic exposure.
How serious is the interaction between Carbachol and Trospium?
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 carbachol, such as less miosis or bladder stimulation. No dose change is needed unless response is inadequate.
What other medicines interact with Trospium?
MediHelp also lists interactions of Trospium with, for example, Clozapine, Pramlintide, Thioridazine. The full list is on the Trospium page.
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