Drug interactions
Carbachol + Pyridostigmine
Severity: Moderate
Carbachol and Pyridostigmine: 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
Carbachol is a direct cholinergic agonist, and pyridostigmine increases acetylcholine levels. Together they can add to produce excess cholinergic stimulation such as bradycardia, bronchospasm, and increased secretions. Systemic exposure to ophthalmic carbachol is low.
What this interaction means in plain words
Carbachol and Pyridostigmine 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.
Carbachol belongs to Miscellaneous; Pyridostigmine belongs to Central Nervous System.
Why it happens
Additive cholinergic effect from a direct muscarinic agonist and a cholinesterase inhibitor.
What to do
Monitor heart rate, respiratory status, and cholinergic symptoms. Reduce the dose of one agent if signs of excess appear.
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 Pyridostigmine
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 Pyridostigmine?
MediHelp rates the interaction as moderate. Carbachol and Pyridostigmine 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. Carbachol is a direct cholinergic agonist, and pyridostigmine increases acetylcholine levels. Together they can add to produce excess cholinergic stimulation such as bradycardia, bronchospasm, and increased secretions. Systemic exposure to ophthalmic carbachol is low.
How serious is the interaction between Carbachol and Pyridostigmine?
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 heart rate, respiratory status, and cholinergic symptoms. Reduce the dose of one agent if signs of excess appear.
What other medicines interact with Pyridostigmine?
MediHelp also lists interactions of Pyridostigmine with, for example, Echothiophate iodide, Huperzine a, Neostigmine. The full list is on the Pyridostigmine page.
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