Drug interactions
Carbachol + Orphenadrin
Severity: Minor
Carbachol and Orphenadrin: 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 direct muscarinic agonist and orphenadrine is an antimuscarinic, so each can reduce the effect of the other. Systemic absorption of ophthalmic carbachol is limited, so the effect is usually modest.
What this interaction means in plain words
Carbachol and Orphenadrin 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; Orphenadrin belongs to Musculoskeletal.
Why it happens
Pharmacodynamic antagonism at muscarinic receptors.
What to do
Monitor for reduced miosis or intraocular pressure effect of carbachol. Adjust therapy if the intended cholinergic effect is lost.
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 Orphenadrin
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 Orphenadrin?
MediHelp rates the interaction as minor. Carbachol and Orphenadrin 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 direct muscarinic agonist and orphenadrine is an antimuscarinic, so each can reduce the effect of the other. Systemic absorption of ophthalmic carbachol is limited, so the effect is usually modest.
How serious is the interaction between Carbachol and Orphenadrin?
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 miosis or intraocular pressure effect of carbachol. Adjust therapy if the intended cholinergic effect is lost.
What other medicines interact with Orphenadrin?
MediHelp also lists interactions of Orphenadrin with, for example, Alfentanil, Amobarbital, Benzhydrocodone / acetaminophen. The full list is on the Orphenadrin page.
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