Drug interactions
Baclofen + Fentanyl transdermal
Severity: Major
Baclofen and Fentanyl transdermal: 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 combined with transdermal fentanyl increases the risk of profound sedation and respiratory depression. Fentanyl continues to be absorbed from the skin depot after patch removal, prolonging the risk.
What this interaction means in plain words
Baclofen 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 CNS and respiratory depression from mu-opioid agonism and GABA-B agonism.
What to do
Reserve for patients lacking alternatives, using the lowest effective doses. Monitor for sedation and respiratory depression, especially after dose increases of either drug.
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 Baclofen
Frequently asked questions
Can I take Baclofen with Fentanyl transdermal?
MediHelp rates the interaction as major. Baclofen 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. Baclofen combined with transdermal fentanyl increases the risk of profound sedation and respiratory depression. Fentanyl continues to be absorbed from the skin depot after patch removal, prolonging the risk.
How serious is the interaction between Baclofen 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: Reserve for patients lacking alternatives, using the lowest effective doses. Monitor for sedation and respiratory depression, especially after dose increases of either drug.
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.
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