DRUG INTERACTIONS
Overview
Regorafenib is metabolized in the liver by oxidative metabolism mediated by CYP3A4 and by
glucuronidation mediated by UGT1A9.
Drug-Drug Interactions
CYP3A4 Inhibitors
Administration of ketoconazole (400 mg for 18 days), a strong CYP3A4 inhibitor, with a single
dose of regorafenib (160 mg on day 5) resulted in an increase in mean regorafenib exposure
(AUC) of approximately 33%, and a decrease in mean exposure of the active metabolites, M-2
(N-oxide) and M-5 (N-oxide and N-desmethyl), of 94% and 93%, respectively. Avoid
concomitant administration of regorafenib with strong CYP3A4 inhibitors.