Alosetron (Hydrochloride) (Standard) is the analytical standard of Alosetron (Hydrochloride). This product is intended for research and analytical applications. Alosetron Hydrochloride (GR 68755C) is a potent and highly selective serotonin 5-HT3 receptor antagonist. Alosetron Hydrochloride is used for the research of irritable bowel syndrome (IBS). Alosetron blocks the fast 5HT3-mediated depolarisation of guinea-pig myenteric and submucosal neurons, with IC₅₀ at ~55 nM. Alosetron Hydrochloride attenuates the visceral nociceptive effect of rectal distension in conscious or anaesthetised dogs. Anti-inflammatory effects^[1][2].