AntacidsMagnesium HydroxideAluminum HydroxideSimethiconeMagnesium OxideSilicic AcidCalcium CarbonateCalcium Channel BlockersHeartburnHistamine H2 AntagonistsRanitidineDrug CombinationsCimetidineSodium BicarbonateSiliconesDrug InteractionsEsophagitis, PepticDuodenoscopyFood-Drug InteractionsGastric Acidity DeterminationTechnetium Tc 99m PyrophosphateBiological AvailabilityAngiotensin II Type 1 Receptor BlockersPotassium Channel BlockersFamotidineDosage FormsAnti-Ulcer AgentsSucralfateCarbonatesAlginatesDimethylpolysiloxanesGastric AcidGastroesophageal RefluxEnoxacinCross-Over StudiesPneumonia, Aspiration