RanitidineGymnemaIntestinal AbsorptionHibiscusBiological AvailabilityAdministration, OralHistamine H2 AntagonistsAbsorptionDietCimetidineBismuthAnti-Ulcer AgentsFamotidineDuodenal UlcerFuransMagnesium HydroxideGastric Acidity DeterminationGastric AcidOmeprazoleSucralfateAntacidsStomach UlcerHeartburnAluminum HydroxideReceptors, Histamine H2Double-Blind MethodEnprostilClarithromycinHistamine AntagonistsEsophagitis, PepticMetronidazoleGastric Juice2-PyridinylmethylsulfinylbenzimidazolesDrug InteractionsAmoxicillinHelicobacter pyloriPeptic UlcerSkin AbsorptionHistamineHelicobacter InfectionsNizatidineLansoprazoleHydrogen-Ion ConcentrationPyrilamineProton Pump InhibitorsDrug Therapy, CombinationHistamine AgonistsGastric MucosaReceptors, HistamineCross-Over StudiesChlorpheniramine