AntacidsMagnesium HydroxideAluminum HydroxideSimethiconeCalcium SignalingCalcium CarbonateMagnesium OxideSilicic AcidCalcium ChannelsCalcium, DietaryHeartburnDrug CombinationsHistamine H2 AntagonistsRanitidineSodium BicarbonateCimetidineSiliconesCalcium PhosphatesCalcium IsotopesDrug InteractionsCalcium ChlorideEsophagitis, PepticBiological AvailabilityDuodenoscopyTechnetium Tc 99m PyrophosphateFood-Drug InteractionsGastric Acidity DeterminationCalcium Channels, L-TypeDosage FormsFamotidineCarbonatesCalcium OxalateAnti-Ulcer AgentsAlginatesSucralfateCalcium GluconateDimethylpolysiloxanesGastric AcidHydrogen-Ion ConcentrationEnoxacinGastroesophageal RefluxCross-Over StudiesMagnesiumCalcium RadioisotopesPneumonia, AspirationIntestinal Absorption