Drug interactions
Fentanyl + Fentanyl transmucosal
Severity: Major
Fentanyl and Fentanyl transmucosal: 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
Two concurrent fentanyl formulations give additive opioid exposure, increasing the chance of oversedation and respiratory depression. Errors in total dosing are a particular concern when several fentanyl products are used.
What this interaction means in plain words
Fentanyl and Fentanyl transmucosal 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 mu-opioid agonist effects from duplicated drug exposure.
What to do
Avoid duplicating fentanyl products unless it is an intentional, labeled breakthrough regimen in an opioid-tolerant patient, and do not interchange products on a mcg-for-mcg basis. Monitor respiratory rate and sedation closely.
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 Fentanyl
- Alvimopan + Fentanyl Contraindicated
- Fentanyl + Isocarboxazid Contraindicated
- Fentanyl + Olanzapine / samidorphan Contraindicated
- Fentanyl + Phenelzine Contraindicated
- Fentanyl + Tranylcypromine Contraindicated
- Alfentanil + Fentanyl Major
Frequently asked questions
Can I take Fentanyl with Fentanyl transmucosal?
MediHelp rates the interaction as major. Fentanyl and Fentanyl transmucosal 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. Two concurrent fentanyl formulations give additive opioid exposure, increasing the chance of oversedation and respiratory depression. Errors in total dosing are a particular concern when several fentanyl products are used.
How serious is the interaction between Fentanyl and Fentanyl transmucosal?
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 duplicating fentanyl products unless it is an intentional, labeled breakthrough regimen in an opioid-tolerant patient, and do not interchange products on a mcg-for-mcg basis. Monitor respiratory rate and sedation closely.
What other medicines interact with Fentanyl?
MediHelp also lists interactions of Fentanyl with, for example, Alvimopan, Isocarboxazid, Olanzapine / samidorphan. The full list is on the Fentanyl page.
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