Drug interactions
Baclofen + Fentanyl transmucosal
Severity: Major
Baclofen 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
Baclofen with transmucosal fentanyl can result in additive sedation and potentially fatal respiratory depression. Transmucosal fentanyl acts rapidly, so effects may appear soon after dosing.
What this interaction means in plain words
Baclofen 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 CNS and respiratory depression from mu-opioid agonism and GABA-B agonism.
What to do
Use only when other treatments are inadequate, with the lowest doses and shortest duration. Monitor for sedation and respiratory depression, and reduce baclofen or fentanyl doses if drowsiness occurs.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Baclofen and Fentanyl transmucosal, 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 14 days on the web. No card needed.
Other interactions of Baclofen
Frequently asked questions
Can I take Baclofen with Fentanyl transmucosal?
MediHelp rates the interaction as major. Baclofen 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. Baclofen with transmucosal fentanyl can result in additive sedation and potentially fatal respiratory depression. Transmucosal fentanyl acts rapidly, so effects may appear soon after dosing.
How serious is the interaction between Baclofen 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: Use only when other treatments are inadequate, with the lowest doses and shortest duration. Monitor for sedation and respiratory depression, and reduce baclofen or fentanyl doses if drowsiness occurs.
What other medicines interact with Baclofen?
MediHelp also lists interactions of Baclofen with, for example, Alfentanil, Amobarbital, Belladonna and opium. The full list is on the Baclofen 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.
