Everolimus and Lapatinib interaction
Everolimus and Lapatinib: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Everolimus (Afinitor) label · effective 2026-06-01
Strong CYP3A inhibitor and P-gp inhibitor : Avoid coadministration.
Effect of Other Drugs on AFINITOR/AFINITOR DISPERZ Strong or Moderate CYP3A Inhibitor and P-gp Inhibitor Avoid the coadministration of a strong CYP3A inhibitor and P-gp inhibitor [see Dosage and Administration (2.11), Clinical Pharmacology (12.3)] .
Moderate CYP3A inhibitor and P-gp inhibitor : Reduce the dosage as recommended.
From the Lapatinib (TYKERB) label · effective 2026-01-27
If unavoidable, consider dose reduction of TYKERB in patients coadministered a strong CYP3A4 inhibitor.
Ketoconazole : In healthy subjects receiving ketoconazole, a CYP3A4 inhibitor, at 200 mg twice daily for 7 days, systemic exposure (AUC) to lapatinib was increased to approximately 3.6-fold of control and half-life increased to 1.7-fold of control.
Effects of Lapatinib on Drug-Metabolizing Enzymes and Drug Transport Systems Lapatinib inhibits CYP3A4, CYP2C8, and P-glycoprotein (P-gp, ABCB1) in vitro at clinically relevant concentrations and is a weak inhibitor of CYP3A4 in vivo.
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Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.