The chemical structure of loperamide hydrochloride is similar to that of dinofibrate, and it has no effect on the central nervous system at the therapeutic dose. It can inhibit the contraction and peristalsis of intestinal smooth muscle. By prolonging the residence time of food in the small intestine, this product can promote the absorption of water, electrolyte and glucose, and has a significant inhibitory effect on the excessive intestinal secretion caused by intestinal endotoxin, but the therapeutic dose does not affect the secretion of gastric acid.