Ethanolactam naphthalene disulfonate is a cholinergic drug that acts directly on smooth muscle choline receptors. It can stimulate gastrointestinal smooth muscle to produce contraction, promote gastrointestinal emptying, and promote the discharge of bile from gallbladder and common bile duct. However, it had no effect on the secretion of gastric juice, the acidity of gastric juice and the concentration of pepsin.