Loperamide hydrochloride is a white or white crystalline powder that can be used as a cathartic or a long-acting antidiarrheal drug, often used in the treatment of acute and chronic dysentery.When taking overdose, drowsiness, constipation, muscle tension, pupil narrowing, slow breathing and other toxic symptoms may occur. Naloxone can be used to detoxify the patient, and observe the patient for at least 48 hours, so as to timely find the inhibitory effect of the central nervous system.