Drug interactions
Ondansetron + Paliperidone
Severity: Moderate
Ondansetron and Paliperidone: 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
Paliperidone and ondansetron can each lengthen the QT interval, so using them together may increase the chance of ventricular arrhythmias including torsades de pointes. Risk is greatest with congenital long QT, bradycardia, heart failure or electrolyte disturbances.
What this interaction means in plain words
Ondansetron and Paliperidone 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; Paliperidone belongs to Central Nervous System.
Why it happens
Additive blockade of cardiac hERG potassium channels causing delayed ventricular repolarization.
What to do
Use the lowest effective ondansetron dose, preferably as a single dose, and correct potassium and magnesium. Obtain an ECG in patients with cardiac risk factors and avoid the combination in congenital 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 Paliperidone
- Ibutilide + Paliperidone Contraindicated
- Paliperidone + Pimozide Contraindicated
- Paliperidone + Vandetanib Contraindicated
- Adagrasib + Paliperidone Major
- Amiodarone + Paliperidone Major
- Amisulpride + Paliperidone Major
Frequently asked questions
Can I take Ondansetron with Paliperidone?
MediHelp rates the interaction as moderate. Ondansetron and Paliperidone 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. Paliperidone and ondansetron can each lengthen the QT interval, so using them together may increase the chance of ventricular arrhythmias including torsades de pointes. Risk is greatest with congenital long QT, bradycardia, heart failure or electrolyte disturbances.
How serious is the interaction between Ondansetron and Paliperidone?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use the lowest effective ondansetron dose, preferably as a single dose, and correct potassium and magnesium. Obtain an ECG in patients with cardiac risk factors and avoid the combination in congenital 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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