Drug interactions
Diphenoxylate-atropine + Fentanyl intranasal
Severity: Major
Diphenoxylate-atropine and Fentanyl intranasal: 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
Fentanyl is a potent opioid, and diphenoxylate adds opioid CNS and respiratory depression. Atropine and fentanyl both slow gut motility, increasing the risk of severe constipation and paralytic ileus, as well as urinary retention.
What this interaction means in plain words
Diphenoxylate-atropine and Fentanyl intranasal 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.
Why it happens
Additive opioid CNS/respiratory depression and additive antimuscarinic and opioid effects on gut and bladder motility.
What to do
Avoid unless clearly needed; if combined, monitor sedation, respiratory rate, bowel function, and urinary output. Use the lowest effective doses.
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
Frequently asked questions
Can I take Diphenoxylate-atropine with Fentanyl intranasal?
MediHelp rates the interaction as major. Diphenoxylate-atropine and Fentanyl intranasal 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. Fentanyl is a potent opioid, and diphenoxylate adds opioid CNS and respiratory depression. Atropine and fentanyl both slow gut motility, increasing the risk of severe constipation and paralytic ileus, as well as urinary retention.
How serious is the interaction between Diphenoxylate-atropine and Fentanyl intranasal?
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 unless clearly needed; if combined, monitor sedation, respiratory rate, bowel function, and urinary output. Use the lowest effective doses.
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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