Otilonium Bromide (CAS 26095-59-0) is an orally-administered muscarinic acetylcholine receptor (mAChR) antagonist exhibiting smooth muscle relaxation properties Its mechanism involves inhibition of calcium mobilization within intestinal smooth muscle cells lowering intracellular free calcium levels and thus attenuating muscle contractile activity In research settings Otilonium Bromide is commonly employed to investigate pathophysiological processes in irritable bowel syndrome (IBS) and dysfunctions associated with intestinal smooth muscle motility