Cilansetron hydrochloride hydrate is a 5-HT3 receptor antagonist. Cilansetron hydrochloride hydrate can be used in studies of irritable bowel syndrome[1].
References
[1] Painsipp E, et al. Alosetron, cilansetron and tegaserod modify mesenteric but not colonic blood flow in rats. Br J Pharmacol. 2009 Nov;158(5):1210-26. DOI:10.1111/j.1476-5381.2009.00392.x