<prompt> Not a Protease inhibitor is -NelfinavirSaquinavirRitonavirAbacavir  <response>: Ans. is d i.e., Abacavir Antiretroviral drugsNucleoside reverse transcriptase inhibitors NRTIs - Zidovudin, Didanosine, Zalcitabine, Stavudine, Lamivudine, Abacavir.Nucleotide reverse transcriptase inhibitor - Tenofovir Katzung 1 OeNonucleoside reverse transcriptase inhibitors NNRTIS - Nevirapine, Efavirenz, Delavirdine, Etravirine.Protease inhibitors - Ritonavir, Indinavir, Nelfmavir, Saquinavir, amprenavir, Lopinavir, Fosamprenavir, Atazanavir, Darunavir, Tipranavir.Fusion inhibitor - Enfuvirtide, Maraviroc.Integrase inhibitors - Roltegravir, Elvitegravir. 