Drug interactions
Lapatinib + Oxaliplatin
Severity: Major
Lapatinib and Oxaliplatin: 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
Lapatinib prolongs the QT interval in a concentration-related manner, and oxaliplatin has been associated with QT prolongation too. The combination may increase the risk of serious arrhythmia, particularly when diarrhea causes electrolyte depletion.
What this interaction means in plain words
Lapatinib and Oxaliplatin 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.
Lapatinib belongs to Oncology; Oxaliplatin belongs to Oncology.
Why it happens
Additive pharmacodynamic prolongation of cardiac repolarization.
What to do
Check ECG and electrolytes at baseline and periodically, replacing potassium and magnesium as needed. Reduce or interrupt lapatinib if the QTc is significantly prolonged.
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 Oxaliplatin
- Adenovirus types 4 and 7 live + Oxaliplatin Contraindicated
- Bcg vaccine live + Oxaliplatin Contraindicated
- Influenza virus vaccine quadrivalent intranasal + Oxaliplatin Contraindicated
- Measles mumps and rubella vaccine live + Oxaliplatin Contraindicated
- Measles mumps and rubella vaccine + Oxaliplatin Contraindicated
- Measles mumps rubella and varicella vaccine live + Oxaliplatin Contraindicated
Other interactions of Lapatinib
- Dofetilide + Lapatinib Contraindicated
- Ibutilide + Lapatinib Contraindicated
- Lapatinib + Pimozide Contraindicated
- Lapatinib + Saquinavir Contraindicated
- Lapatinib + Thioridazine Contraindicated
- Adagrasib + Lapatinib Major
Frequently asked questions
Can I take Lapatinib with Oxaliplatin?
MediHelp rates the interaction as major. Lapatinib and Oxaliplatin 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. Lapatinib prolongs the QT interval in a concentration-related manner, and oxaliplatin has been associated with QT prolongation too. The combination may increase the risk of serious arrhythmia, particularly when diarrhea causes electrolyte depletion.
How serious is the interaction between Lapatinib and Oxaliplatin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check ECG and electrolytes at baseline and periodically, replacing potassium and magnesium as needed. Reduce or interrupt lapatinib if the QTc is significantly prolonged.
What other medicines interact with Oxaliplatin?
MediHelp also lists interactions of Oxaliplatin with, for example, Adenovirus types 4 and 7 live, Bcg vaccine live, Influenza virus vaccine quadrivalent intranasal. The full list is on the Oxaliplatin page.
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