Drug interactions
Fentanyl intranasal + Paroxetine
Severity: Major
Fentanyl intranasal 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. Paroxetine's CYP2D6 inhibition is not expected to alter fentanyl metabolism much, since fentanyl is mainly cleared by CYP3A4.
What this interaction means in plain words
Fentanyl intranasal 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
Use the combination only when needed and monitor for serotonin syndrome, particularly at initiation and dose increases. Educate patients to report agitation, tremor, sweating or fever promptly.
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 intranasal with Paroxetine?
MediHelp rates the interaction as major. Fentanyl intranasal 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. Paroxetine's CYP2D6 inhibition is not expected to alter fentanyl metabolism much, since fentanyl is mainly cleared by CYP3A4.
How serious is the interaction between Fentanyl intranasal 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: Use the combination only when needed and monitor for serotonin syndrome, particularly at initiation and dose increases. Educate patients to report agitation, tremor, sweating or fever promptly.
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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