Gastrointestinal TransitGastric EmptyingGastrointestinal MotilityIleusDefecationCroton OilCastor OilDigestive System Physiological PhenomenaZanthoxylumMedicine, East Asian TraditionalLoperamideConstipationNalbuphineAntidiarrhealsGastrointestinal AgentsExplosionsMedetomidineColonReceptors, Serotonin, 5-HT4LantanaIntestine, SmallGastrointestinal TractGingerPentazocinePeristalsisMorphineCisaprideMetoclopramideIntestinal AbsorptionAnalgesics, OpioidYohimbineFecesIleumClonidineDietary FiberDose-Response Relationship, DrugDigestive SystemDelayed-Action PreparationsStomachDiarrheaIntestinesProbioticsBiological AvailabilityAdrenergic alpha-AgonistsDrug InteractionsCross-Over StudiesMuscle, SmoothAdministration, OralTime FactorsMuscle ContractionRats, WistarDouble-Blind Method