There are several drugs to treat diarrhea: 1, a volume laxative, such as wheat bran, mainly cellulose, which can improve constipation by increasing the water content of stool; 2. Osmotic laxatives, such as lactulose, polyethylene glycol, magnesium sulfate and mannitol, can promote the increase of intestinal juice and improve constipation; 3, irritating laxatives, irritating laxatives such as phenolphthalein tablets, often referred to as guide tablets, senna leaves, castor oil, but there are also some fecal softeners, such as liquid paraffin and kaisai dew. Clinically, patients are mainly advised to use volumetric laxatives or osmotic laxatives, which have relatively mild effects and little side effects. If constipation is particularly serious, irritating laxatives can be added temporarily, but the disadvantage of frequent use of irritating laxatives is that it will lead to more serious constipation. For patients who feel stool in the anus, it is called outlet obstructive constipation. Softening agents such as kaisailu can be used to soften the stool and then promote the excretion of the stool. There are mainly the above drugs to improve constipation.