Drug interactions
Inotuzumab + Ondansetron
Severity: Major
Inotuzumab 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
Inotuzumab ozogamicin is associated with QT prolongation, and ondansetron adds to this effect. This may increase the risk of ventricular arrhythmias in patients who often have other risk factors.
What this interaction means in plain words
Inotuzumab 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.
Why it happens
Additive QT interval prolongation.
What to do
Obtain ECGs and electrolytes before and after starting and periodically during treatment, and correct potassium and magnesium. Consider an alternative antiemetic if QTc increases markedly.
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
Frequently asked questions
Can I take Inotuzumab with Ondansetron?
MediHelp rates the interaction as major. Inotuzumab 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. Inotuzumab ozogamicin is associated with QT prolongation, and ondansetron adds to this effect. This may increase the risk of ventricular arrhythmias in patients who often have other risk factors.
How serious is the interaction between Inotuzumab 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: Obtain ECGs and electrolytes before and after starting and periodically during treatment, and correct potassium and magnesium. Consider an alternative antiemetic if QTc increases markedly.
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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