Bowel movements

Bowel movements refer to the physiological process of defecation, which is the final stage of the digestive process involving the elimination of solid or liquid waste from the body [1]. This process is highly complex and is not a singular molecular target, such as a protein or enzyme, but rather a coordinated neuromuscular event involving the enteric nervous system and smooth muscle [2]. It is regulated by various signaling pathways, including those involving serotonin (5-HT), acetylcholine, and opioid peptides [3]. In clinical pharmacology, bowel movements serve as a primary clinical endpoint for drugs treating gastrointestinal disorders like constipation or diarrhea [4]. Common pharmacological interventions include laxatives that increase stool volume or stimulate nerves, and antidiarrheals that slow transit time. Because it is a systemic physiological outcome involving multiple tissues and pathways, it cannot be classified as a specific therapeutic target molecule [5]. Monitoring bowel movements is critical for assessing the efficacy of gastrointestinal agents and the safety profile of drugs like opioids that induce side effects such as constipation [1, 4].

Other names

DefecationStool passageFecal eliminationEgestionGastrointestinal motility

Modification of gastrointestinal transit and stool consistency through osmotic effects, direct stimulation of the myenteric plexus, or modulation of specific receptors like 5-HT4 and mu-opioid receptors.