Drug interactions
Ondansetron + Sevoflurane
Severity: Moderate
Ondansetron and Sevoflurane: 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
Sevoflurane can prolong the QT interval during anesthesia, and ondansetron is commonly given perioperatively for nausea. The combined effect may increase the risk of arrhythmia in susceptible patients, although routine use is generally well tolerated.
What this interaction means in plain words
Ondansetron and Sevoflurane 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.
Ondansetron belongs to Gastrointestinal Tract; Sevoflurane belongs to Central Nervous System.
Why it happens
Additive prolongation of cardiac repolarization.
What to do
Check electrolytes before surgery in patients with QT risk factors and monitor the ECG during anesthesia. Avoid adding further QT-prolonging drugs in patients with long QT syndrome.
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 Sevoflurane
Frequently asked questions
Can I take Ondansetron with Sevoflurane?
MediHelp rates the interaction as moderate. Ondansetron and Sevoflurane 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. Sevoflurane can prolong the QT interval during anesthesia, and ondansetron is commonly given perioperatively for nausea. The combined effect may increase the risk of arrhythmia in susceptible patients, although routine use is generally well tolerated.
How serious is the interaction between Ondansetron and Sevoflurane?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check electrolytes before surgery in patients with QT risk factors and monitor the ECG during anesthesia. Avoid adding further QT-prolonging drugs in patients with long QT syndrome.
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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