Drug interactions
Fentanyl transmucosal + Paroxetine
Severity: Major
Fentanyl transmucosal and Paroxetine: 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
Combining an SSRI with fentanyl may precipitate serotonin syndrome, with agitation, hyperthermia, clonus and autonomic instability. Rapid transmucosal absorption gives high peak fentanyl levels during episodic use.
What this interaction means in plain words
Fentanyl transmucosal and Paroxetine 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 serotonergic activity from SSRI reuptake inhibition and fentanyl's weak serotonergic effects.
What to do
Monitor for serotonin syndrome, especially when starting or increasing either drug. Consider an opioid with less serotonergic activity if symptoms emerge.
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 Paroxetine
- Isocarboxazid + Paroxetine Contraindicated
- Methylene blue + Paroxetine Contraindicated
- Paroxetine + Phenelzine Contraindicated
- Paroxetine + Pimozide Contraindicated
- Paroxetine + Procarbazine Contraindicated
- Paroxetine + Selegiline Contraindicated
Frequently asked questions
Can I take Fentanyl transmucosal with Paroxetine?
MediHelp rates the interaction as major. Fentanyl transmucosal and Paroxetine 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. Combining an SSRI with fentanyl may precipitate serotonin syndrome, with agitation, hyperthermia, clonus and autonomic instability. Rapid transmucosal absorption gives high peak fentanyl levels during episodic use.
How serious is the interaction between Fentanyl transmucosal and Paroxetine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for serotonin syndrome, especially when starting or increasing either drug. Consider an opioid with less serotonergic activity if symptoms emerge.
What other medicines interact with Paroxetine?
MediHelp also lists interactions of Paroxetine with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Paroxetine page.
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