Gastrointestinal TransitGastric EmptyingGastrointestinal MotilityConstipationDefecationColonIleusCroton OilGastrointestinal AgentsCastor OilColonic Diseases, FunctionalDefecographyDigestive System Physiological PhenomenaZanthoxylumMedicine, East Asian TraditionalIntestine, SmallFecal ImpactionColonic DiseasesLoperamideIrritable Bowel SyndromeAntidiarrhealsFecesEncopresisNalbuphineIndium RadioisotopesDiarrheaManometryExplosionsMedetomidineReceptors, Serotonin, 5-HT4CatharticsGastrointestinal TractLantanaLactulosePeristalsisDietary FiberSerotonin 5-HT4 Receptor AntagonistsColon, AscendingGingerRectumSerotonin 5-HT4 Receptor AgonistsColonic NeoplasmsPentazocineCisaprideIntestinal AbsorptionMorphineDose-Response Relationship, DrugMuscle CrampDouble-Blind MethodSerotonin 5-HT3 Receptor AntagonistsIleumBenzofuransMetoclopramideCross-Over StudiesLaxativesAnalgesics, OpioidYohimbineRadiography, AbdominalClonidineAdministration, OralDigestive SystemReceptors, Corticotropin-Releasing HormoneCarbolinesTime FactorsCapsulesDelayed-Action PreparationsUrocortinsIntestinesAnal CanalStomachReceptor, Fibroblast Growth Factor, Type 4Serotonin AntagonistsProbioticsSerotonin Receptor AgonistsRats, Sprague-DawleyEnteric Nervous SystemBiological AvailabilityRadionuclide ImagingAbdominal PainMuscle, SmoothAdrenergic alpha-Agonists