In vitro- undersøgelsermed humane levermikrosomer indikerer, at aprepitant primært metaboliseres af CYP3A4, muligvis med mindre deltagelse af CYP1A2 og CYP2C19.
In vitro studies using human liver microsomes indicate that aprepitant is metabolised primarily by CYP3A4 and potentially with minor contribution by CYP1A2 and CYP2C19.