Drug interactions
Ondansetron + Pitolisant
Severity: Major
Ondansetron and Pitolisant: 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
Pitolisant can prolong the QT interval and ondansetron has a similar effect. Combined use may increase the risk of torsades de pointes, especially with other risk factors.
What this interaction means in plain words
Ondansetron and Pitolisant 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.
Ondansetron belongs to Gastrointestinal Tract; Pitolisant belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic QT prolongation.
What to do
Avoid the combination and choose another antiemetic when possible. If it cannot be avoided, check an ECG and electrolytes and monitor for palpitations or syncope.
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 Ondansetron
- Apomorphine + Ondansetron Contraindicated
- Ondansetron + Thioridazine Contraindicated
- Ondansetron + Vandetanib Contraindicated
- Adagrasib + Ondansetron Major
- Amiodarone + Ondansetron Major
- Amisulpride + Ondansetron Major
Other interactions of Pitolisant
- Alfuzosin + Pitolisant Major
- Amiodarone + Pitolisant Major
- Amisulpride + Pitolisant Major
- Anagrelide + Pitolisant Major
- Asenapine + Pitolisant Major
- Bupropion + Pitolisant Major
Frequently asked questions
Can I take Ondansetron with Pitolisant?
MediHelp rates the interaction as major. Ondansetron and Pitolisant 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. Pitolisant can prolong the QT interval and ondansetron has a similar effect. Combined use may increase the risk of torsades de pointes, especially with other risk factors.
How serious is the interaction between Ondansetron and Pitolisant?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination and choose another antiemetic when possible. If it cannot be avoided, check an ECG and electrolytes and monitor for palpitations or syncope.
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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