Drug interactions
Carbachol + Tiotropium
Severity: Minor
Carbachol and Tiotropium: 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 muscarinic agonist and tiotropium is a muscarinic antagonist, so they have opposing effects and may reduce each other's action. The clinical impact depends on the route of carbachol, and ophthalmic use has little systemic effect.
What this interaction means in plain words
Carbachol and Tiotropium 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; Tiotropium belongs to Respiratory.
Why it happens
Pharmacodynamic antagonism at muscarinic receptors.
What to do
Monitor for reduced response to either drug when carbachol is given systemically. No action is needed with ophthalmic use.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Carbachol and Tiotropium, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Tiotropium
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 Tiotropium?
MediHelp rates the interaction as minor. Carbachol and Tiotropium 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 muscarinic agonist and tiotropium is a muscarinic antagonist, so they have opposing effects and may reduce each other's action. The clinical impact depends on the route of carbachol, and ophthalmic use has little systemic effect.
How serious is the interaction between Carbachol and Tiotropium?
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 response to either drug when carbachol is given systemically. No action is needed with ophthalmic use.
What other medicines interact with Tiotropium?
MediHelp also lists interactions of Tiotropium with, for example, Glycopyrrolate inhaled, Indacaterol-glycopyrronium, Revefenacin. The full list is on the Tiotropium page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
