BethanecholBethanechol CompoundsStomachParasympathomimeticsMuscarinic AgonistsTropicamideAgeusiaPentagastrinStomach NeoplasmsParasympatholyticsAtropineGastric AcidReceptors, MuscarinicMuscarinic AntagonistsGastric MucosaPirenzepineMetiamideReceptor, Muscarinic M3Cholinergic AgentsGastric JuiceAmylasesStomach DiseasesGastrointestinal MotilityDuodenum