Drug interactions
Orphenadrine + Pyridostigmine
Severity: Moderate
Orphenadrine 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
Orphenadrine has anticholinergic properties that can oppose pyridostigmine's muscarinic effects. It may also worsen weakness in myasthenia gravis and mask signs of cholinergic excess.
What this interaction means in plain words
Orphenadrine 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.
Why it happens
Anticholinergic antagonism of acetylcholine effects, with possible additional neuromuscular effects.
What to do
Avoid orphenadrine in myasthenia gravis where possible; if used, monitor muscle strength and pyridostigmine 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 Pyridostigmine
Frequently asked questions
Can I take Orphenadrine with Pyridostigmine?
MediHelp rates the interaction as moderate. Orphenadrine 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. Orphenadrine has anticholinergic properties that can oppose pyridostigmine's muscarinic effects. It may also worsen weakness in myasthenia gravis and mask signs of cholinergic excess.
How serious is the interaction between Orphenadrine 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: Avoid orphenadrine in myasthenia gravis where possible; if used, monitor muscle strength and pyridostigmine response.
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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