Drug interactions
Belladonna and opium + Neostigmine
Severity: Minor
Belladonna and opium and Neostigmine: minor 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 action of neostigmine, and opium reduces gut motility, countering the prokinetic effect of neostigmine. The therapeutic effect of neostigmine on gut or bladder function may be reduced.
What this interaction means in plain words
Belladonna and opium and Neostigmine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Antimuscarinic and opioid effects pharmacodynamically antagonize cholinesterase-inhibitor-induced smooth muscle stimulation.
What to do
Avoid combining when neostigmine is used for motility or urinary retention. Otherwise monitor response and adjust the dose.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Neostigmine
Frequently asked questions
Can I take Belladonna and opium with Neostigmine?
MediHelp rates the interaction as minor. Belladonna and opium and Neostigmine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. The belladonna component opposes the muscarinic action of neostigmine, and opium reduces gut motility, countering the prokinetic effect of neostigmine. The therapeutic effect of neostigmine on gut or bladder function may be reduced.
How serious is the interaction between Belladonna and opium and Neostigmine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining when neostigmine is used for motility or urinary retention. Otherwise monitor response and adjust the dose.
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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