Intestinal transit

Intestinal transit refers to the physiological process and the time required for ingested material to travel through the small and large intestines. This process is essential for proper digestion, nutrient absorption, and the eventual elimination of waste. It is regulated by a complex interplay of the enteric nervous system, myogenic activity of smooth muscle cells, and various neuroendocrine signals such as serotonin and motilin (StatPearls, NBK526124). While not a single molecular target, intestinal transit is a key clinical parameter used to diagnose and manage gastrointestinal motility disorders. For instance, delayed transit is a hallmark of chronic idiopathic constipation and gastroparesis, whereas accelerated transit is associated with malabsorption and secretory diarrhea (NIH, MedlinePlus). Many therapeutic agents are designed to modulate this process; prokinetic drugs like prucalopride accelerate transit by targeting 5-HT4 receptors, while antidiarrheals like loperamide slow transit by activating mu-opioid receptors in the gut wall (PubMed, PMID: 25431925). Monitoring transit time is often achieved through diagnostic tools like radiopaque markers or wireless motility capsules to assess the efficacy of these treatments.

Other names

Gastrointestinal transitGI transitGut motilityIntestinal motilityBowel transit time

Drugs modulate intestinal transit by acting as agonists or antagonists on specific molecular targets within the enteric nervous system or intestinal musculature, such as 5-HT4 receptors, mu-opioid receptors, or chloride channels, to either accelerate or delay the movement of luminal contents.