Drug interactions
Granisetron + Mobocertinib
Severity: Major
Granisetron and Mobocertinib: major interaction.
Last updated Sources: US FDA label
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
Mobocertinib carries a boxed warning for QT prolongation and torsades de pointes. Adding granisetron, which also has QT effects, increases the arrhythmic risk.
What this interaction means in plain words
Granisetron and Mobocertinib 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 prolongation of the QT interval.
What to do
Avoid the combination where possible and choose a non-QT-prolonging antiemetic. If unavoidable, monitor ECG and electrolytes closely and reduce or hold mobocertinib if QTc rises 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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References
Other interactions of Granisetron
- Apomorphine + Granisetron Contraindicated
- Amiodarone + Granisetron Major
- Amisulpride + Granisetron Major
- Arsenic trioxide + Granisetron Major
- Artemether / lumefantrine + Granisetron Major
- Artemether + Granisetron Major
Frequently asked questions
Can I take Granisetron with Mobocertinib?
MediHelp rates the interaction as major. Granisetron and Mobocertinib 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. Mobocertinib carries a boxed warning for QT prolongation and torsades de pointes. Adding granisetron, which also has QT effects, increases the arrhythmic risk.
How serious is the interaction between Granisetron and Mobocertinib?
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 where possible and choose a non-QT-prolonging antiemetic. If unavoidable, monitor ECG and electrolytes closely and reduce or hold mobocertinib if QTc rises markedly.
What other medicines interact with Granisetron?
MediHelp also lists interactions of Granisetron with, for example, Apomorphine, Amiodarone, Amisulpride. The full list is on the Granisetron page.
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