Drug interactions
Lapatinib + Zanubrutinib
Severity: Minor
Lapatinib and Zanubrutinib: minor 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
Zanubrutinib is metabolized mainly by CYP3A4, and lapatinib as a weak inhibitor may modestly raise its exposure. Higher levels could increase bleeding, cytopenias and infection risk.
What this interaction means in plain words
Lapatinib and Zanubrutinib have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Lapatinib belongs to Oncology; Zanubrutinib belongs to Oncology.
Why it happens
Lapatinib inhibits CYP3A4, decreasing zanubrutinib clearance.
What to do
Monitor blood counts and for bleeding. Zanubrutinib dose reduction is specified for moderate or strong CYP3A4 inhibitors and is not routinely needed with a weak one.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Lapatinib and Zanubrutinib, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Lapatinib
- Dofetilide + Lapatinib Contraindicated
- Ibutilide + Lapatinib Contraindicated
- Lapatinib + Pimozide Contraindicated
- Lapatinib + Saquinavir Contraindicated
- Lapatinib + Thioridazine Contraindicated
- Adagrasib + Lapatinib Major
Other interactions of Zanubrutinib
Frequently asked questions
Can I take Lapatinib with Zanubrutinib?
MediHelp rates the interaction as minor. Lapatinib and Zanubrutinib have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Zanubrutinib is metabolized mainly by CYP3A4, and lapatinib as a weak inhibitor may modestly raise its exposure. Higher levels could increase bleeding, cytopenias and infection risk.
How serious is the interaction between Lapatinib and Zanubrutinib?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood counts and for bleeding. Zanubrutinib dose reduction is specified for moderate or strong CYP3A4 inhibitors and is not routinely needed with a weak one.
What other medicines interact with Lapatinib?
MediHelp also lists interactions of Lapatinib with, for example, Dofetilide, Ibutilide, Pimozide. The full list is on the Lapatinib page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
