<prompt> Not a Protease inhibitor is ?NelfinavirSaquinavirRitonavirAbacavir  <response>: Ans. is d i.e., Abacavir Antiretroviral drugs Nucleoside reverse transcriptase inhibitors NIs - Zidovudin, Didanosine, Zalcitabine, Stavudine, Lamivudine, Abacavir. Nucleotide reverse transcriptase inhibitor - Tenofovir Katzung 10the Nonucleoside reverse transcriptase inhibitors NNIS - Nevirapine, Eirenz, Delavirdine, Etravirine. Protease inhibitors - Ritonavir, Indinavir, Nelfinavir, Saquinavir, amprenavir, Lopinavir, Fosamprenavir, Atazanavir, Darunavir, Tipranavir. Fusion inhibitor - Enfuviide, Maraviroc. Integrase inhibitors - Roltegravir, Elvitegravir. 