Drug interactions
Milnacipran + Ondansetron
Severity: Moderate
Milnacipran and Ondansetron: 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
Milnacipran increases serotonin and norepinephrine activity, and ondansetron has been associated with serotonin syndrome when combined with serotonergic agents. The absolute risk appears low, but the reaction can be serious.
What this interaction means in plain words
Milnacipran and Ondansetron 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.
Milnacipran belongs to Central Nervous System; Ondansetron belongs to Gastrointestinal Tract.
Why it happens
Additive serotonergic effects.
What to do
Monitor for agitation, tremor, hyperreflexia, sweating and fever, especially after dose changes. Discontinue the agents and give supportive care if serotonin syndrome is 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 Ondansetron
- Apomorphine + Ondansetron Contraindicated
- Ondansetron + Thioridazine Contraindicated
- Ondansetron + Vandetanib Contraindicated
- Adagrasib + Ondansetron Major
- Amiodarone + Ondansetron Major
- Amisulpride + Ondansetron Major
Other interactions of Milnacipran
- Isocarboxazid + Milnacipran Contraindicated
- Methylene blue + Milnacipran Contraindicated
- Milnacipran + Phenelzine Contraindicated
- Milnacipran + Procarbazine Contraindicated
- Milnacipran + Rasagiline Contraindicated
- Milnacipran + Safinamide Contraindicated
Frequently asked questions
Can I take Milnacipran with Ondansetron?
MediHelp rates the interaction as moderate. Milnacipran and Ondansetron 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. Milnacipran increases serotonin and norepinephrine activity, and ondansetron has been associated with serotonin syndrome when combined with serotonergic agents. The absolute risk appears low, but the reaction can be serious.
How serious is the interaction between Milnacipran and Ondansetron?
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, hyperreflexia, sweating and fever, especially after dose changes. Discontinue the agents and give supportive care if serotonin syndrome is suspected.
What other medicines interact with Ondansetron?
MediHelp also lists interactions of Ondansetron with, for example, Apomorphine, Thioridazine, Vandetanib. The full list is on the Ondansetron page.
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