Drug interactions
Darifenacin + Diphenoxylate-atropine
Severity: Moderate
Darifenacin and Diphenoxylate-atropine: 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
Darifenacin is a muscarinic antagonist and atropine adds to its antimuscarinic load. This can worsen constipation, dry mouth, urinary retention, blurred vision and, in older adults, confusion.
What this interaction means in plain words
Darifenacin and Diphenoxylate-atropine 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; Diphenoxylate-atropine belongs to Gastrointestinal Tract.
Why it happens
Additive muscarinic receptor antagonism.
What to do
Monitor for anticholinergic adverse effects, particularly constipation and urinary retention, and limit duration of the antidiarrheal.
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 Diphenoxylate-atropine, 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 Diphenoxylate-atropine
- Diphenoxylate-atropine + Isocarboxazid Contraindicated
- Diphenoxylate-atropine + Phenelzine Contraindicated
- Diphenoxylate-atropine + Tranylcypromine Contraindicated
- Alfentanil + Diphenoxylate-atropine Major
- Alvimopan + Diphenoxylate-atropine Major
- Amitriptyline + Diphenoxylate-atropine Major
Other interactions of Darifenacin
Frequently asked questions
Can I take Darifenacin with Diphenoxylate-atropine?
MediHelp rates the interaction as moderate. Darifenacin and Diphenoxylate-atropine 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 is a muscarinic antagonist and atropine adds to its antimuscarinic load. This can worsen constipation, dry mouth, urinary retention, blurred vision and, in older adults, confusion.
How serious is the interaction between Darifenacin and Diphenoxylate-atropine?
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 anticholinergic adverse effects, particularly constipation and urinary retention, and limit duration of the antidiarrheal.
What other medicines interact with Diphenoxylate-atropine?
MediHelp also lists interactions of Diphenoxylate-atropine with, for example, Isocarboxazid, Phenelzine, Tranylcypromine. The full list is on the Diphenoxylate-atropine 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.
