Dronedarone and Lapatinib interaction
Dronedarone 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 Lapatinib (TYKERB) label · effective 2026-01-27
These conditions include patients with hypokalemia or hypomagnesemia, with congenital long QT syndrome, patients taking antiarrhythmic medicines or other medicinal products with known risk for QT prolongation/ Torsades de Pointes, and cumulative high-dose anthracycline therapy.
If unavoidable, consider dose reduction of TYKERB in patients coadministered a strong CYP3A4 inhibitor.
TYKERB may prolong the QT interval in some patients.
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.
From the Dronedarone (Multaq) label · effective 2026-01-27
Follow label recommendations for concomitant use of other statins with a CYP3A and P-gp inhibitor like dronedarone.
Taking more than these two? Interactions stack. Check your whole list at once; it stays in your browser.
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.