Drug interactions
Diphenoxylate-atropine + Donepezil transdermal
Severity: Moderate
Diphenoxylate-atropine and Donepezil transdermal: 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 blocks muscarinic receptors, opposing the cholinergic effect of donepezil, so the efficacy of both can be reduced. The atropine dose in diphenoxylate-atropine is low, so the effect is usually modest.
What this interaction means in plain words
Diphenoxylate-atropine and Donepezil transdermal 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 an anticholinergic and a cholinesterase inhibitor.
What to do
Avoid regular use of anticholinergic agents with donepezil where possible and use short courses of diphenoxylate-atropine only. Monitor cognition and diarrhea control.
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 Diphenoxylate-atropine and Donepezil transdermal, 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
Frequently asked questions
Can I take Diphenoxylate-atropine with Donepezil transdermal?
MediHelp rates the interaction as moderate. Diphenoxylate-atropine and Donepezil transdermal 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 blocks muscarinic receptors, opposing the cholinergic effect of donepezil, so the efficacy of both can be reduced. The atropine dose in diphenoxylate-atropine is low, so the effect is usually modest.
How serious is the interaction between Diphenoxylate-atropine and Donepezil transdermal?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid regular use of anticholinergic agents with donepezil where possible and use short courses of diphenoxylate-atropine only. Monitor cognition and diarrhea control.
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.
