Drug interactions
Diphenoxylate-atropine + Fentanyl transdermal
Severity: Major
Diphenoxylate-atropine and Fentanyl transdermal: major interaction.
Last updated Sources: US FDA label
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
Transdermal fentanyl is a potent long-acting opioid, and diphenoxylate adds opioid effects including sedation and respiratory depression. Atropine may worsen constipation and urinary retention.
What this interaction means in plain words
Diphenoxylate-atropine and Fentanyl transdermal 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 antimuscarinic effects on gut and bladder.
What to do
Avoid combined use when possible; if needed, monitor sedation, respiratory rate and bowel function and use the lowest 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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References
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 transdermal?
MediHelp rates the interaction as major. Diphenoxylate-atropine and Fentanyl transdermal 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. Transdermal fentanyl is a potent long-acting opioid, and diphenoxylate adds opioid effects including sedation and respiratory depression. Atropine may worsen constipation and urinary retention.
How serious is the interaction between Diphenoxylate-atropine and Fentanyl transdermal?
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 combined use when possible; if needed, monitor sedation, respiratory rate and bowel function and use the lowest 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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