FamotidineCimetidineHistamine H2 AntagonistsRanitidineGastric AcidAnti-Ulcer AgentsGastric Acidity DeterminationReceptors, Histamine H2DimapritGuanidinesStomach UlcerDuodenal UlcerHistamineAntacidsNizatidineOmeprazoleTabletsGastric MucosaHistamine AgonistsPharmaceutical SolutionsHistamine H1 AntagonistsOrganic Cation Transport ProteinsLansoprazoleHistamine Antagonists