In vitro- undersøgelser antyder glukuronidering som en metabolisk vej, samt at cytokrom P450 3A4 er det væsentligste cytokrom P450- isozym med ansvar for dannelsen af oxidative metabolitter.
In vitro studies suggest glucuronidation as a metabolic pathway, and that cytochrome P450 3A4 is the major cytochrome P450 isozyme responsible for formation of the oxidative metabolites.