Drug interactions
Difenoxin + Diphenoxylate-atropine
Severity: Major
Difenoxin and Diphenoxylate-atropine: major 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
Difenoxin is the active metabolite of diphenoxylate, so the two together amount to duplicate antidiarrheal opioid therapy. This increases the risk of opioid effects such as sedation, constipation, and in excess respiratory depression, as well as toxic megacolon in colitis.
What this interaction means in plain words
Difenoxin and Diphenoxylate-atropine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Difenoxin belongs to Gastrointestinal Tract; Diphenoxylate-atropine belongs to Gastrointestinal Tract.
Why it happens
Therapeutic duplication: both act as mu-opioid agonists on gut and CNS, giving additive effects.
What to do
Avoid using both together and choose a single antidiarrheal. If an overdose is suspected, monitor respiration and consider naloxone.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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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 Difenoxin
- Difenoxin + Isocarboxazid Major
- Difenoxin + Linezolid Major
- Difenoxin + Phenelzine Major
- Difenoxin + Rasagiline Major
- Difenoxin + Selegiline Major
- Difenoxin + Tranylcypromine Major
Frequently asked questions
Can I take Difenoxin with Diphenoxylate-atropine?
MediHelp rates the interaction as major. Difenoxin and Diphenoxylate-atropine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Difenoxin is the active metabolite of diphenoxylate, so the two together amount to duplicate antidiarrheal opioid therapy. This increases the risk of opioid effects such as sedation, constipation, and in excess respiratory depression, as well as toxic megacolon in colitis.
How serious is the interaction between Difenoxin and Diphenoxylate-atropine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid using both together and choose a single antidiarrheal. If an overdose is suspected, monitor respiration and consider naloxone.
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.
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