Drug interactions
Lapatinib + Oxcarbazepine
Severity: Major
Lapatinib and Oxcarbazepine: 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
Oxcarbazepine may substantially lower lapatinib exposure and reduce efficacy. Lapatinib is a CYP3A4 substrate and labeling advises avoiding strong inducers.
What this interaction means in plain words
Lapatinib and Oxcarbazepine 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; Oxcarbazepine belongs to Central Nervous System.
Why it happens
CYP3A4 induction by oxcarbazepine increases lapatinib clearance.
What to do
Use a non-inducing antiepileptic where possible. If unavoidable, lapatinib dose titration upward per labeling for inducers with careful monitoring is needed.
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 Oxcarbazepine
- Cabotegravir + Oxcarbazepine Contraindicated
- Oxcarbazepine + Rilpivirine Contraindicated
- Artemether / lumefantrine + Oxcarbazepine Major
- Atazanavir + Oxcarbazepine Major
- Benzhydrocodone / acetaminophen + Oxcarbazepine Major
- Bictegravir + Oxcarbazepine Major
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 Oxcarbazepine?
MediHelp rates the interaction as major. Lapatinib and Oxcarbazepine 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. Oxcarbazepine may substantially lower lapatinib exposure and reduce efficacy. Lapatinib is a CYP3A4 substrate and labeling advises avoiding strong inducers.
How serious is the interaction between Lapatinib and Oxcarbazepine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use a non-inducing antiepileptic where possible. If unavoidable, lapatinib dose titration upward per labeling for inducers with careful monitoring is needed.
What other medicines interact with Oxcarbazepine?
MediHelp also lists interactions of Oxcarbazepine with, for example, Cabotegravir, Rilpivirine, Artemether / lumefantrine. The full list is on the Oxcarbazepine page.
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