In vitro eksperimenter har vist at saquinavir' s metabolisme er P450 medieret med det specifikke isoenzym, CYP3A4, som ansvarlig for over 90% af den hepatiske metabolisme.
In vitro studies using human liver microsomes have shown that the metabolism of saquinavir is cytochrome P450 mediated with the specific isoenzyme, CYP3A4, responsible for more than 90% of the hepatic metabolism.