YM-31636 is a potent and selective 5-HT₃ agonist. Systemic administration of YM-31636 increased the number of fecal pellets in rats, and improves colonic motility. It also increases colonic secretions, but not to the point of inducing

diarrhea Diarrhea, also spelled diarrhoea, is the condition of having at least three loose, liquid, or watery bowel movements each day. It often lasts for a few days and can result in dehydration due to fluid loss. Signs of dehydration often begin w ...

. In addition, it did not reduce the

visceral pain Visceral pain is pain that results from the activation of nociceptors of the thoracic, pelvic, or abdominal viscera (organs). Visceral structures are highly sensitive to distension (stretch), ischemia and inflammation, but relatively insensitive to ...

threshold, or increase the intensity of visceral pain. These properties indicate that it could be a useful treatment for

constipation Constipation is a bowel dysfunction that makes bowel movements infrequent or hard to pass. The stool is often hard and dry. Other symptoms may include abdominal pain, bloating, and feeling as if one has not completely passed the bowel movement ...

References

{{Serotonergics Imidazoles Indenes Serotonin receptor agonists Thiazoles 5-HT3 agonists