AntacidsHelicobacter pyloriGastritisMagnesium HydroxideGastritis, AtrophicAluminum HydroxideSimethiconeGastric MucosaHelicobacter InfectionsMagnesium OxideSilicic AcidCalcium CarbonatePyloric AntrumGastroscopyStomachGastritis, HypertrophicMetaplasiaPeptic UlcerPepsinogen AHeartburnStomach UlcerStomach NeoplasmsRanitidineDyspepsiaHistamine H2 AntagonistsAchlorhydriaGastric Acidity DeterminationDuodenal UlcerAnti-Ulcer AgentsEsophagitis, PepticDrug CombinationsCimetidineGastric AcidSodium BicarbonateBile RefluxDuodenoscopySiliconesGastrinsGastric JuiceGastroesophageal RefluxPepsinogen CDrug InteractionsFamotidineStomach DiseasesOmeprazoleFood-Drug InteractionsTechnetium Tc 99m PyrophosphateSucralfateBiological AvailabilityHelicobacter felisHelicobacter heilmanniiParietal Cells, GastricChronic DiseaseDuodenitisAnemia, PerniciousDosage FormsEsophagitisHelicobacterCarbonatesBiopsyAlginatesDimethylpolysiloxanesUreaseEnoxacinPepsinogensPostgastrectomy SyndromesPneumonia, AspirationCross-Over StudiesProton Pump Inhibitors