Gastrointestinal TransitGastric EmptyingGastrointestinal MotilityIleusDefecationCroton OilCastor OilDigestive System Physiological PhenomenaZanthoxylumMedicine, East Asian TraditionalLoperamideConstipationNalbuphineAntidiarrhealsGastrointestinal AgentsExplosionsMedetomidineColonReceptors, Serotonin, 5-HT4LantanaIntestine, SmallGastrointestinal TractGingerPentazocinePeristalsisMorphineCisaprideMetoclopramideIntestinal AbsorptionAnalgesics, OpioidFecesYohimbineClonidineIleumDose-Response Relationship, DrugDietary FiberDigestive SystemDelayed-Action PreparationsDiarrheaStomachIntestinesBiological AvailabilityProbioticsAdrenergic alpha-AgonistsDrug InteractionsCross-Over StudiesMuscle, SmoothAdministration, OralTime FactorsMuscle ContractionRats, WistarDouble-Blind Method