Drug interactions
Baclofen + Fentanyl iontophoretic transdermal system
Severity: Major
Baclofen and Fentanyl iontophoretic transdermal system: 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 can add to the sedative and respiratory depressant effects of fentanyl delivered by an iontophoretic system. This may cause oversedation, slow breathing or coma.
What this interaction means in plain words
Baclofen and Fentanyl iontophoretic transdermal system 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 together only when other options are inadequate, keeping baclofen doses low. Monitor sedation and respiratory rate, particularly in opioid-naive or elderly patients.
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 iontophoretic transdermal system?
MediHelp rates the interaction as major. Baclofen and Fentanyl iontophoretic transdermal system 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 can add to the sedative and respiratory depressant effects of fentanyl delivered by an iontophoretic system. This may cause oversedation, slow breathing or coma.
How serious is the interaction between Baclofen and Fentanyl iontophoretic transdermal system?
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 together only when other options are inadequate, keeping baclofen doses low. Monitor sedation and respiratory rate, particularly in opioid-naive or elderly patients.
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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