RanitidineGymnemaIntestinal AbsorptionHibiscusBiological AvailabilityHistamineAdministration, OralHistamine H2 AntagonistsAbsorptionReceptors, Histamine H2Receptors, Histamine H1DietCimetidineReceptors, HistamineHistamine ReleaseHistamine AntagonistsHistamine AgonistsHistamine H1 AntagonistsBismuthFamotidineAnti-Ulcer AgentsReceptors, Histamine H3Duodenal UlcerFuransGastric AcidMagnesium HydroxidePyrilamineGastric Acidity DeterminationOmeprazoleSucralfateHistamine N-MethyltransferaseAntacidsMethylhistaminesStomach UlcerChlorpheniramineDimapritHeartburnAluminum HydroxideHistidine DecarboxylaseGastric JuiceHistamine H3 AntagonistsHistamine AgentsDouble-Blind MethodGastric MucosaDiphenhydramineDrug InteractionsEnprostilClarithromycinImpromidineEsophagitis, Peptic2-PyridinylmethylsulfinylbenzimidazolesMetronidazolePeptic UlcerGastrinsHelicobacter pyloriAmoxicillinMetiamideDose-Response Relationship, DrugSkin AbsorptionNizatidineHydrogen-Ion ConcentrationHelicobacter InfectionsStomachProton Pump InhibitorsLansoprazolePheniramineGuanidinesMast CellsDrug Therapy, Combinationp-Methoxy-N-methylphenethylamineCross-Over StudiesPentagastrinGuinea PigsJejunumBethanechol Compounds