Drug interactions
Netupitant / palonosetron + Paroxetine
Severity: Moderate
Netupitant / palonosetron and Paroxetine: moderate 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
5-HT3 antagonists such as palonosetron have been associated with rare serotonin syndrome when combined with serotonergic drugs. Netupitant inhibits CYP3A4, which is not a main pathway for paroxetine, so the main concern is serotonergic.
What this interaction means in plain words
Netupitant / palonosetron and Paroxetine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Possible additive serotonergic effects; the mechanism is not well established.
What to do
Monitor for agitation, tremor, diaphoresis, and hyperthermia after administration. Treat promptly as serotonin syndrome if these appear.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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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 Netupitant / palonosetron with Paroxetine?
MediHelp rates the interaction as moderate. Netupitant / palonosetron and Paroxetine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. 5-HT3 antagonists such as palonosetron have been associated with rare serotonin syndrome when combined with serotonergic drugs. Netupitant inhibits CYP3A4, which is not a main pathway for paroxetine, so the main concern is serotonergic.
How serious is the interaction between Netupitant / palonosetron and Paroxetine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for agitation, tremor, diaphoresis, and hyperthermia after administration. Treat promptly as serotonin syndrome if these appear.
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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