Drug interactions
Inotuzumab + Ribociclib
Severity: Major
Inotuzumab and Ribociclib: 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
Both agents can prolong the QT interval, so combined use increases the risk of ventricular arrhythmias including torsades de pointes. Inotuzumab also carries hepatotoxicity risk, which adds complexity.
What this interaction means in plain words
Inotuzumab and Ribociclib 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 pharmacodynamic QTc prolongation.
What to do
Avoid combining if an alternative exists. Otherwise obtain ECG and electrolytes at baseline and periodically, correcting potassium and magnesium.
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 Ribociclib
- Amiodarone + Ribociclib Contraindicated
- Cisapride + Ribociclib Contraindicated
- Dofetilide + Ribociclib Contraindicated
- Dronedarone + Ribociclib Contraindicated
- Flibanserin + Ribociclib Contraindicated
- Ibutilide + Ribociclib Contraindicated
Frequently asked questions
Can I take Inotuzumab with Ribociclib?
MediHelp rates the interaction as major. Inotuzumab and Ribociclib 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. Both agents can prolong the QT interval, so combined use increases the risk of ventricular arrhythmias including torsades de pointes. Inotuzumab also carries hepatotoxicity risk, which adds complexity.
How serious is the interaction between Inotuzumab and Ribociclib?
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 combining if an alternative exists. Otherwise obtain ECG and electrolytes at baseline and periodically, correcting potassium and magnesium.
What other medicines interact with Ribociclib?
MediHelp also lists interactions of Ribociclib with, for example, Amiodarone, Cisapride, Dofetilide. The full list is on the Ribociclib page.
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