The chemical name of mannitol is sodium sulfate, with more than 10 crystalline water. In Chinese medicine, it is used orally to increase the fluid in the intestines and has a laxative effect. It can also be used externally to disperse canker sores and to soften and disperse knots. It is also effective for adhesions and intestinal obstruction. It can be used in urology, mainly for its diarrheal effect, to reduce the heat accumulation in the intestinal tract by diarrhea, so that the heat accumulation can be reduced, the accumulation of heat into stones, for urinary stones or intestinal obstruction can be treated with mannitol.