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Irritable bowel syndrome (IBS) is a functional gastrointestinal disorder characterized by abdominal pain, discomfort, and altered bowel habits, which affects the quality of life of approximately 10% of the worldwide population. IBS is classified into three types: IBS-D (diarrhea-predominant), IBS-C (constipation-predominant), and mixed or alternating IBS (IBS-M). Among the potential interventions for IBS-D, the antagonism of the serotonin 5-HT 3  receptor has recently emerged as an effective treatment option. Serotonin (5-HT) is a neurotransmitter and an immunoregulatory factor, which plays a key role in physiological and pathological processes of the human body, having an impact on intestinal motility and gland secretion, which assist in maintaining intestinal homeostasis. In this paper, the concept of 5-HT 3  antagonists in the treatment of individuals with IBS-D is discussed, with particular focus on mechanism of action and pre-clinical and clinical data. This study is based on pertinent papers that were retrieved by a selective search using relevant keywords in PubMed and ScienceDirect databases. Recent clinical trial data have confirmed beyond doubt the value of 5-HT 3  antagonists. As for future directions, weak partial 5-HT 3  receptor agonism appears to be an appealing alternative to a silent antagonist for the treatment of IBS-D.

An overview of 5-HT 3 receptor antagonists as a treatment option for irritable bowel syndrome with diarrhea