Eluxadoline

Eluxadoline is a mixed mu-opioid receptor agonist, kappa-opioid receptor agonist, and a-delta opioid receptor antagonist indicated for use in diarrhea-predominant irritable bowel syndrome (IBS-D). The mu-, kappa-, and delta-opioid receptors mediate endogenous and exogenous opioid response in the central nervous system and peripherally in the gastrointestinal system. Agonism of peripheral mu-opioid receptors results in reduced colonic motility, while antagonism of central delta-opioid receptors results in improved analgesia, making eluxadoline usable for the symptoms of both pain and diarrhea characteristic of IBS-D. Marketed under the tradename Viberzi (FDA), eluxadoline is an antimotility agent that decreases bowel contractions, inhibits colonic transit, and reduces fluid/ion secretion resulting in improved symptoms of abdominal pain and reductions in the Bristol Stool Scale.