Drug interactions
Oxybutynin + Pyridostigmine
Severity: Moderate
Oxybutynin 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
Pyridostigmine increases acetylcholine by inhibiting cholinesterase, while oxybutynin blocks muscarinic receptors, so they oppose each other. In myasthenia gravis, this may reduce the benefit of pyridostigmine on muscarinic effects, though oxybutynin may be used to limit its cholinergic side effects.
What this interaction means in plain words
Oxybutynin 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.
Oxybutynin belongs to Genitourinary; Pyridostigmine belongs to Central Nervous System.
Why it happens
Pharmacodynamic opposition between cholinesterase inhibition and muscarinic antagonism.
What to do
Monitor for loss of effect and for masking of cholinergic toxicity. Adjust doses based on clinical response.
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 Oxybutynin
Other interactions of Pyridostigmine
Frequently asked questions
Can I take Oxybutynin with Pyridostigmine?
MediHelp rates the interaction as moderate. Oxybutynin 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. Pyridostigmine increases acetylcholine by inhibiting cholinesterase, while oxybutynin blocks muscarinic receptors, so they oppose each other. In myasthenia gravis, this may reduce the benefit of pyridostigmine on muscarinic effects, though oxybutynin may be used to limit its cholinergic side effects.
How serious is the interaction between Oxybutynin 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 for loss of effect and for masking of cholinergic toxicity. Adjust doses based on clinical response.
What other medicines interact with Oxybutynin?
MediHelp also lists interactions of Oxybutynin with, for example, Bethanechol, Clozapine, Potassium chloride. The full list is on the Oxybutynin page.
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