Drug interactions
Darifenacin + Neostigmine
Severity: Moderate
Darifenacin 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
Neostigmine enhances cholinergic transmission while darifenacin blocks muscarinic receptors, so the two have opposing effects. Darifenacin may reduce the effect of neostigmine on bladder, gut, and secretions, while neostigmine's therapeutic action at the neuromuscular junction is largely preserved.
What this interaction means in plain words
Darifenacin 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.
Darifenacin belongs to Genitourinary; Neostigmine belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism between a cholinesterase inhibitor and a muscarinic receptor antagonist.
What to do
Monitor for loss of neostigmine's muscarinic effect, such as reduced gut or bladder stimulation. Reassess the need for darifenacin if neostigmine is being used to treat urinary retention or ileus.
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 Darifenacin
Other interactions of Neostigmine
Frequently asked questions
Can I take Darifenacin with Neostigmine?
MediHelp rates the interaction as moderate. Darifenacin 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. Neostigmine enhances cholinergic transmission while darifenacin blocks muscarinic receptors, so the two have opposing effects. Darifenacin may reduce the effect of neostigmine on bladder, gut, and secretions, while neostigmine's therapeutic action at the neuromuscular junction is largely preserved.
How serious is the interaction between Darifenacin 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: Monitor for loss of neostigmine's muscarinic effect, such as reduced gut or bladder stimulation. Reassess the need for darifenacin if neostigmine is being used to treat urinary retention or ileus.
What other medicines interact with Darifenacin?
MediHelp also lists interactions of Darifenacin with, for example, Atazanavir, Bethanechol, Clarithromycin. The full list is on the Darifenacin page.
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