Gastrointestinal TransitGastric EmptyingGastrointestinal MotilityIleusDefecationCroton OilCastor OilDigestive System Physiological PhenomenaZanthoxylumMedicine, East Asian TraditionalLoperamideConstipationNalbuphineAntidiarrhealsGastrointestinal AgentsExplosionsMedetomidineColonReceptors, Serotonin, 5-HT4LantanaIntestine, SmallGastrointestinal TractGingerPentazocinePeristalsisMorphineCisaprideMetoclopramideIntestinal AbsorptionAnalgesics, OpioidYohimbineFecesClonidineIleumDietary FiberDose-Response Relationship, DrugDigestive SystemDelayed-Action PreparationsDiarrheaStomachIntestinesProbioticsBiological AvailabilityAdrenergic alpha-AgonistsDrug InteractionsCross-Over StudiesMuscle, SmoothAdministration, OralMuscle ContractionTime FactorsRats, WistarDouble-Blind Method