CisaprideGastrointestinal AgentsGastric EmptyingGastrointestinal MotilityMetoclopramideGastroparesisDomperidoneMotilinReceptors, Serotonin, 5-HT4Gastrointestinal TransitPiperidinesDyspepsiaBenzyl CompoundsErythromycinSerotonin 5-HT4 Receptor AgonistsFumariaLaxativesViolaGastroesophageal RefluxSerotonin Receptor AgonistsAsclepiadaceaeGallbladder EmptyingConstipationPeristalsisBenzamidesSerotonin AntagonistsEnergy MetabolismEsophagitis, PepticLipid MetabolismAntiemeticsStomachSimethiconeManometryMorpholinesDefecationCross-Over StudiesDouble-Blind MethodAdministration, OralDose-Response Relationship, Drug