Renzapride hydrochloride is a benzamide that inhibits irritable bowel syndrome and has antagonistic activity at 5-HT(3) receptors and agonistic activity at 5-HT(4) receptors. Renzapride hydrochloride also exhibits antagonistic activity at 5-HT(2B) receptors and has a certain affinity for 5-HT(2A) and 5-HT(2C) receptors[1].