Drug interactions
Darifenacin + Physostigmine
Severity: Moderate
Darifenacin and Physostigmine: 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
Physostigmine inhibits acetylcholinesterase and increases cholinergic activity, which opposes the muscarinic blockade of darifenacin. Each drug may reduce the effect of the other.
What this interaction means in plain words
Darifenacin and Physostigmine 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 between a cholinesterase inhibitor and a muscarinic antagonist.
What to do
Monitor for loss of antimuscarinic effect and for cholinergic effects such as bradycardia or increased secretions. Adjust the doses according to the clinical goal.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Darifenacin and Physostigmine, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Darifenacin
Frequently asked questions
Can I take Darifenacin with Physostigmine?
MediHelp rates the interaction as moderate. Darifenacin and Physostigmine 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. Physostigmine inhibits acetylcholinesterase and increases cholinergic activity, which opposes the muscarinic blockade of darifenacin. Each drug may reduce the effect of the other.
How serious is the interaction between Darifenacin and Physostigmine?
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 antimuscarinic effect and for cholinergic effects such as bradycardia or increased secretions. Adjust the doses according to the clinical goal.
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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
