FamotidineRitonavirOrganophosphonatesAdenineHistamine H2 AntagonistsLopinavirHIV Protease InhibitorsPyrimidinonesAnti-HIV AgentsCimetidineRanitidineSaquinavirGastric AcidAnti-Ulcer AgentsHIV InfectionsGastric Acidity DeterminationReverse Transcriptase InhibitorsDrug InteractionsVaginal Creams, Foams, and JelliesIndinavirLamivudineDrug Therapy, CombinationBenzoxazinesDideoxynucleosidesArea Under CurveHIV-1Stomach UlcerTabletsPhosphorous AcidsDrug Resistance, ViralNizatidineAntiretroviral Therapy, Highly ActiveCarbamatesPyridinesViral LoadReceptors, Histamine H2OmeprazoleDimapritLansoprazoleNelfinavirOrganophosphorus Compounds2-Pyridinylmethylsulfinylbenzimidazoles