Drug interactions
Atropine + Neostigmine
Severity: Moderate
Atropine and Neostigmine: 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
Atropine and neostigmine have opposing actions at muscarinic receptors. Atropine blocks the muscarinic effects of neostigmine, such as bradycardia, bronchoconstriction and secretions, which is why they are often given together deliberately to reverse neuromuscular block. Atropine can also mask early signs of cholinergic excess.
What this interaction means in plain words
Atropine and Neostigmine 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.
Atropine belongs to Miscellaneous; Neostigmine belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism: neostigmine inhibits acetylcholinesterase while atropine blocks muscarinic receptors.
What to do
When used together for reversal of neuromuscular block, monitor heart rate and ECG and titrate doses. In myasthenia gravis, watch for cholinergic crisis that atropine may mask, since nicotinic effects are not blocked.
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 Atropine
- Atropine + Eluxadoline Major
- Atropine + Henbane Major
- Atropine + Pramlintide Major
- Abobotulinumtoxina + Atropine Moderate
- Aclidinium + Atropine Moderate
- Amantadine + Atropine Moderate
Other interactions of Neostigmine
Frequently asked questions
Can I take Atropine with Neostigmine?
MediHelp rates the interaction as moderate. Atropine and Neostigmine 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. Atropine and neostigmine have opposing actions at muscarinic receptors. Atropine blocks the muscarinic effects of neostigmine, such as bradycardia, bronchoconstriction and secretions, which is why they are often given together deliberately to reverse neuromuscular block. Atropine can also mask early signs of cholinergic excess.
How serious is the interaction between Atropine and Neostigmine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: When used together for reversal of neuromuscular block, monitor heart rate and ECG and titrate doses. In myasthenia gravis, watch for cholinergic crisis that atropine may mask, since nicotinic effects are not blocked.
What other medicines interact with Atropine?
MediHelp also lists interactions of Atropine with, for example, Eluxadoline, Henbane, Pramlintide. The full list is on the Atropine page.
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