Drug interactions
Fingolimod + Ondansetron
Severity: Major
Fingolimod and Ondansetron: 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
Fingolimod causes bradycardia and has been associated with QT prolongation, and ondansetron can also lengthen the QT interval. Together they may increase the risk of serious arrhythmia, especially around fingolimod initiation.
What this interaction means in plain words
Fingolimod and Ondansetron 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.
Fingolimod belongs to Central Nervous System; Ondansetron belongs to Gastrointestinal Tract.
Why it happens
Additive QT prolongation combined with fingolimod-induced bradycardia, which promotes torsades de pointes.
What to do
Avoid ondansetron around fingolimod initiation and monitor the ECG if it is needed. Use an antiemetic with less QT effect where possible.
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 Fingolimod
- Adenovirus types 4 and 7 live + Fingolimod Contraindicated
- Bcg vaccine live + Fingolimod Contraindicated
- Fingolimod + Pimozide Contraindicated
- Fingolimod + Ponesimod Contraindicated
- Fingolimod + Quinidine Contraindicated
- Fingolimod + Siponimod Contraindicated
Frequently asked questions
Can I take Fingolimod with Ondansetron?
MediHelp rates the interaction as major. Fingolimod and Ondansetron 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. Fingolimod causes bradycardia and has been associated with QT prolongation, and ondansetron can also lengthen the QT interval. Together they may increase the risk of serious arrhythmia, especially around fingolimod initiation.
How serious is the interaction between Fingolimod and Ondansetron?
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 ondansetron around fingolimod initiation and monitor the ECG if it is needed. Use an antiemetic with less QT effect where possible.
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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