Constipation is a common and complex clinical symptom, which mainly refers to the decrease in the frequency of defecation, the decrease in the volume of feces, the dryness of feces, and the effort of defecation. It is necessary to judge whether you have constipation or not by taking into account the nature of the feces, your usual bowel habits, and whether you have difficulty in defecating. Once it is confirmed that you have constipation, through diet and simple food therapy mediation are not effective, it is necessary to choose a safe, effective, can be taken for a long period of time, so as to carry on conservative treatment. At present, the clinical commonly used laxatives have the following categories: 1, volumetric laxatives for some not easily absorbed by the intestinal wall and easily soluble in water salt preparations, orally in the formation of hypertonic salt solution in the intestines, so that the intestinal lumen of the water increased, the volume expanded, stimulate the intestinal mucosa, causing intestinal peristalsis enhanced defecation. The drugs are magnesium sulfate, sodium sulfate, white composite and so on. 2, stimulating laxative drugs or its metabolites in the body to stimulate the intestinal wall, so that intestinal peristalsis to strengthen and promote defecation. Drugs are phenolphthalein, bisacodyl, castor oil, fruit guide, rhubarb and so on. 3, lubricating laxatives This type of drug can lubricate the intestinal wall, soften the stool, so that feces are easy to discharge. Commonly used drugs are glycerin, liquid paraffin, glycerin suppositories, Keseru, hemp pill and so on.