Drug interactions
Fenfluramine + Palonosetron
Severity: Minor
Fenfluramine and Palonosetron: minor 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
Fenfluramine works through increased serotonergic activity, so potent serotonin receptor antagonists could theoretically reduce its antiseizure effect. Palonosetron selectively blocks 5-HT3 receptors, so any clinical effect is likely small.
What this interaction means in plain words
Fenfluramine and Palonosetron have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Fenfluramine belongs to Central Nervous System; Palonosetron belongs to Gastrointestinal Tract.
Why it happens
Possible pharmacodynamic antagonism of serotonergic activity; not well established for 5-HT3 antagonists.
What to do
Monitor seizure frequency if palonosetron is used repeatedly. No dose change is usually needed for short-term antiemetic use.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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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 Fenfluramine
- Fenfluramine + Isocarboxazid Contraindicated
- Fenfluramine + Linezolid Contraindicated
- Fenfluramine + Phenelzine Contraindicated
- Fenfluramine + Selegiline Contraindicated
- Fenfluramine + Tranylcypromine Contraindicated
- Almotriptan + Fenfluramine Major
Frequently asked questions
Can I take Fenfluramine with Palonosetron?
MediHelp rates the interaction as minor. Fenfluramine and Palonosetron have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Fenfluramine works through increased serotonergic activity, so potent serotonin receptor antagonists could theoretically reduce its antiseizure effect. Palonosetron selectively blocks 5-HT3 receptors, so any clinical effect is likely small.
How serious is the interaction between Fenfluramine and Palonosetron?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor seizure frequency if palonosetron is used repeatedly. No dose change is usually needed for short-term antiemetic use.
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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