<prompt> All of the following cause inhibition of CYP3A except.SaquinavirRitonavirItraconazoleErythromycin  <response>: Ans. A SaquinavirRef: Katzung 11the p58, 863All the drugs given in the options are microsomal enzyme inhibitors. Among protease inhibitors, ritonavir is the strongest inhibitor of CYP3A4 enzymes whereas saquinavir is the weakest. 