Drug interactions
Neostigmine + Orphenadrine
Severity: Moderate
Neostigmine and Orphenadrine: 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 oppose neostigmine. This may weaken neostigmine's benefit, for example in myasthenia gravis, and can worsen muscle weakness.
What this interaction means in plain words
Neostigmine and Orphenadrine 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
Pharmacodynamic antagonism from antimuscarinic activity.
What to do
Avoid orphenadrine in myasthenia gravis where possible; otherwise monitor muscle strength and neostigmine 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 Neostigmine
Frequently asked questions
Can I take Neostigmine with Orphenadrine?
MediHelp rates the interaction as moderate. Neostigmine and Orphenadrine 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 oppose neostigmine. This may weaken neostigmine's benefit, for example in myasthenia gravis, and can worsen muscle weakness.
How serious is the interaction between Neostigmine and Orphenadrine?
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; otherwise monitor muscle strength and neostigmine response.
What other medicines interact with Neostigmine?
MediHelp also lists interactions of Neostigmine with, for example, Huperzine a, Physostigmine, Pyridostigmine. The full list is on the Neostigmine page.
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