RanitidineGymnemaIntestinal AbsorptionHibiscusBiological AvailabilityAdministration, OralHistamine H2 AntagonistsAbsorptionDietCimetidineBismuthAnti-Ulcer AgentsFamotidineFuransDuodenal UlcerMagnesium HydroxideGastric Acidity DeterminationGastric AcidOmeprazoleSucralfateHepatic ArteryAntacidsStomach UlcerHeartburnHepatic VeinsAluminum HydroxideLiverReceptors, Histamine H2Double-Blind MethodEnprostilClarithromycinDrug InteractionsHistamine AntagonistsEsophagitis, PepticMetronidazoleGastric Juice2-PyridinylmethylsulfinylbenzimidazolesHepatic EncephalopathyAmoxicillinHelicobacter pyloriPeptic UlcerHistamineSkin AbsorptionHelicobacter InfectionsHepatic Stellate CellsNizatidineHydrogen-Ion ConcentrationDrug Therapy, CombinationLansoprazolePyrilamineProton Pump InhibitorsGastric MucosaHistamine AgonistsCross-Over StudiesReceptors, HistamineTime FactorsHalf-LifeDose-Response Relationship, DrugJejunumSpectrophotometry, AtomicChlorpheniramineRandom Allocation