Drug interactions
Belladonna and opium + Pyridostigmine
Severity: Moderate
Belladonna and opium 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
The belladonna component opposes the muscarinic effects of pyridostigmine. Opium also reduces gut motility and can cause respiratory depression, which may be hazardous in myasthenia gravis.
What this interaction means in plain words
Belladonna and opium 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
Pharmacodynamic antagonism by muscarinic blockade, plus opioid-mediated reduction in gut motility and respiratory drive.
What to do
Monitor muscle strength and respiratory function, and use the lowest effective opioid dose. Choose an alternative to belladonna and opium if pyridostigmine response falls.
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 Belladonna and opium with Pyridostigmine?
MediHelp rates the interaction as moderate. Belladonna and opium 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. The belladonna component opposes the muscarinic effects of pyridostigmine. Opium also reduces gut motility and can cause respiratory depression, which may be hazardous in myasthenia gravis.
How serious is the interaction between Belladonna and opium 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 muscle strength and respiratory function, and use the lowest effective opioid dose. Choose an alternative to belladonna and opium if pyridostigmine response falls.
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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