Co-administration of regorafenib with warfarin (a substrate of CYP2C9) resulted in a mean
increase of 25% in AUC, and 26% in the Cmax of S-warfarin as compared to warfarin alone.
These data suggest that regorafenib may have a weak inhibitory effect on the CYP2C9 mediated
metabolism of S-warfarin which is not likely to be clinically meaningful.