Drug interactions
Neostigmine + Scopolamine
Severity: Minor
Neostigmine and Scopolamine: 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
Scopolamine blocks muscarinic receptors while neostigmine raises acetylcholine levels by inhibiting cholinesterase, so each drug partly opposes the muscarinic effects of the other. This opposition is used deliberately when an antimuscarinic is given to limit the muscarinic side effects of neostigmine. The net result depends on dose and timing and can leave either under- or over-treatment of some effects.
What this interaction means in plain words
Neostigmine and Scopolamine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Neostigmine belongs to Central Nervous System; Scopolamine belongs to Respiratory.
Why it happens
Pharmacodynamic antagonism at muscarinic receptors between an antimuscarinic and a cholinesterase inhibitor.
What to do
No routine change is needed; monitor heart rate, secretions and bowel or bladder function when they are given together. Titrate the antimuscarinic to the muscarinic effects seen with neostigmine.
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 Scopolamine
Other interactions of Neostigmine
Frequently asked questions
Can I take Neostigmine with Scopolamine?
MediHelp rates the interaction as minor. Neostigmine and Scopolamine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Scopolamine blocks muscarinic receptors while neostigmine raises acetylcholine levels by inhibiting cholinesterase, so each drug partly opposes the muscarinic effects of the other. This opposition is used deliberately when an antimuscarinic is given to limit the muscarinic side effects of neostigmine. The net result depends on dose and timing and can leave either under- or over-treatment of some effects.
How serious is the interaction between Neostigmine and Scopolamine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No routine change is needed; monitor heart rate, secretions and bowel or bladder function when they are given together. Titrate the antimuscarinic to the muscarinic effects seen with neostigmine.
What other medicines interact with Scopolamine?
MediHelp also lists interactions of Scopolamine with, for example, Benzhydrocodone / acetaminophen, Buprenorphine long-acting, Buprenorphine subdermal implant. The full list is on the Scopolamine page.
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