Drug interactions
Palonosetron + Phenelzine
Severity: Major
Palonosetron and Phenelzine: 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
Non-selective MAO inhibitors markedly raise serotonin availability, and adding a 5-HT3 antagonist has been linked to serotonin syndrome in rare reports. Because the MAOI baseline risk is high, the combination warrants more caution.
What this interaction means in plain words
Palonosetron and Phenelzine 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.
Palonosetron belongs to Gastrointestinal Tract; Phenelzine belongs to Central Nervous System.
Why it happens
Irreversible MAO inhibition increases serotonin, with possible additive serotonergic effects from the antiemetic.
What to do
Prefer a non-serotonergic antiemetic where feasible; if used, give the lowest dose and monitor closely for serotonin syndrome. Stop both drugs and treat if it occurs.
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 Palonosetron
- Apomorphine + Palonosetron Contraindicated
- Isocarboxazid + Palonosetron Major
- Palonosetron + Tranylcypromine Major
- Almotriptan + Palonosetron Moderate
- Amitriptyline + Palonosetron Moderate
- Amoxapine + Palonosetron Moderate
Other interactions of Phenelzine
- 5-HTP + Phenelzine Contraindicated
- Amitriptyline + Phenelzine Contraindicated
- Amoxapine + Phenelzine Contraindicated
- Atomoxetine + Phenelzine Contraindicated
- Benzphetamine + Phenelzine Contraindicated
- Brimonidine + Phenelzine Contraindicated
Frequently asked questions
Can I take Palonosetron with Phenelzine?
MediHelp rates the interaction as major. Palonosetron and Phenelzine 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. Non-selective MAO inhibitors markedly raise serotonin availability, and adding a 5-HT3 antagonist has been linked to serotonin syndrome in rare reports. Because the MAOI baseline risk is high, the combination warrants more caution.
How serious is the interaction between Palonosetron and Phenelzine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Prefer a non-serotonergic antiemetic where feasible; if used, give the lowest dose and monitor closely for serotonin syndrome. Stop both drugs and treat if it occurs.
What other medicines interact with Palonosetron?
MediHelp also lists interactions of Palonosetron with, for example, Apomorphine, Isocarboxazid, Tranylcypromine. The full list is on the Palonosetron page.
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