Commonly used drugs for constipation patients are volumetric laxatives, osmotic laxatives and lubricating laxatives. 1. Volumetric laxatives: can accelerate the colon and the whole gastrointestinal tract, adsorption of water, so that the stool is soft and easy to discharge, relieve constipation and defecation urgency, mainly including soluble cellulose (pectin, psyllium, oat bran, etc.) and insoluble fibers (plant fibers, lignin, etc.), can be used to improve the symptoms of constipation with Ou Psyllium, polycarbophilic calcium, bran, methylcellulose, and so on. 2. Osmotic laxatives: commonly used drugs such as lactulose, through the formation of hypertonic state adsorption of water, increase the volume of feces, suitable for mild and moderate constipation patients. 3. Lubricating laxatives: the commonly used drug Keserol can lubricate the intestinal wall and soften the feces, which is suitable for elderly patients with chronic diseases. 4. Stimulating laxatives: stimulate the intestinal wall, enhance intestinal peristalsis, promote defecation, long-term use of dependence can occur, resulting in colorectal melanosis, irreversible damage to the enteric nervous system. The main drugs are rhubarb, senna and so on. In order to minimize adverse drug reactions, short-term use is recommended, avoiding long-term use. If the patient suffers from constipation, it is recommended to go to the hospital in a timely manner, according to the doctor’s instructions for the use of medication, do not buy their own drugs to avoid aggravating the condition.