Drug interactions
Palonosetron + Paroxetine
Severity: Moderate
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
Rare serotonin syndrome cases have been associated with 5-HT3 antagonists plus SSRIs. The absolute risk is low but the reaction can be serious.
What this interaction means in plain words
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.
Palonosetron belongs to Gastrointestinal Tract; Paroxetine belongs to Central Nervous System.
Why it happens
Possible additive serotonergic effects; causality is not firmly established.
What to do
Monitor for agitation, tremor, clonus and hyperthermia. Discontinue and treat supportively if suspected.
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 Palonosetron
- Apomorphine + Palonosetron Contraindicated
- Isocarboxazid + Palonosetron Major
- Palonosetron + Phenelzine Major
- Palonosetron + Tranylcypromine Major
- Almotriptan + Palonosetron Moderate
- Amitriptyline + Palonosetron Moderate
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 Palonosetron with Paroxetine?
MediHelp rates the interaction as moderate. 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. Rare serotonin syndrome cases have been associated with 5-HT3 antagonists plus SSRIs. The absolute risk is low but the reaction can be serious.
How serious is the interaction between 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, clonus and hyperthermia. Discontinue and treat supportively if suspected.
What other medicines interact with Palonosetron?
MediHelp also lists interactions of Palonosetron with, for example, Apomorphine, Isocarboxazid, Phenelzine. The full list is on the Palonosetron page.
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