FamotidineRitonavirHistamine H2 AntagonistsLopinavirHIV Protease InhibitorsPyrimidinonesCimetidineRanitidineGastric AcidSaquinavirAnti-Ulcer AgentsGastric Acidity DeterminationIndinavirAnti-HIV AgentsDrug InteractionsStomach UlcerNizatidineTabletsHIV InfectionsReceptors, Histamine H2OmeprazoleDimapritCarbamatesArea Under CurveLansoprazoleNelfinavirDrug Therapy, Combination2-Pyridinylmethylsulfinylbenzimidazoles