CimetidineHistamine H2 AntagonistsGuanidinesRanitidineFamotidineDuodenal UlcerReceptors, Histamine H2DimapritAdministration, OralHistamineGastric AcidReceptors, HistaminePyrilamineAnti-Ulcer AgentsStomach UlcerDrug InteractionsMagnesium HydroxideHistamine H1 AntagonistsDiphenhydramineHistamine AntagonistsAntacidsReceptors, Histamine H1Organic Cation Transport ProteinsHistamine AgonistsGastric Acidity DeterminationAluminum HydroxideImpromidineGastric JuiceChlorpheniramineDose-Response Relationship, DrugMetiamidePentagastrinFuransGastric MucosaDouble-Blind MethodClinical Trials as Topic