<prompt> All drugs are used in AIDS EXCEPT:AbacavirRitonavirAcyclovirTenofovir  <response>: Ans. c AcyclovirRef. Katzung 11th ed. 860 Acyclovir is an acyclic guanosine derivative with clinical activity against HSV-1, HSV-2, and VZV. In vitro activity against Epstein-Barr virus EBV, cytomegalovirus CMV, and human herpesvirus-6 HHV-6.ANTI-RETROVIRAL DRUGS Nucleoside reverse tanscriptase inhibitor: Zidovudine, Stavudine, Lamivudine, Didanosine, Emtricitabine, Zalcitabine, Abacavir Nucleotide reverse tanscriptase inhibitor: Tenofovir Protease inhibitors: Indinavir, Saquinavir, Ritonavir, Atazanavir, Nelfinavir, Amprenavir, Lopinavir. 