Gastrointestinal TransitConstipationGastric EmptyingDefecationGastrointestinal MotilityIleusLaxativesCroton OilCastor OilDigestive System Physiological PhenomenaZanthoxylumLoperamideMedicine, East Asian TraditionalGastrointestinal AgentsCatharticsColonAntidiarrhealsNalbuphineReceptors, Serotonin, 5-HT4Fecal ImpactionExplosionsGastrointestinal TractMedetomidineIntestine, SmallLantanaCisapridePeristalsisGingerAnalgesics, OpioidPentazocineMorphineDietary FiberFecesEncopresisDiarrheaDefecographyIleumMetoclopramideIntestinal AbsorptionIrritable Bowel SyndromeYohimbineSenna ExtractClonidineDose-Response Relationship, DrugColonic Diseases, FunctionalRectumProbioticsDelayed-Action PreparationsFecal IncontinenceDigestive SystemIntestinesMegacolonStomachManometryAnal CanalAbdominal PainBiofeedback, PsychologyCross-Over StudiesBiological AvailabilityDouble-Blind MethodAdministration, OralAdrenergic alpha-AgonistsChronic DiseaseLactuloseToilet TrainingMuscle, SmoothDrug InteractionsTime FactorsRectal DiseasesMuscle ContractionSerotonin 5-HT4 Receptor Agonists