Mannitol Injection has the effects of tissue dehydration, lowering intraocular pressure and osmotic diuresis, which can be used in the treatment of cerebral edema and cirrhotic ascites. Mannitol Injection has the effect of tissue dehydration, which can be used for the treatment of cerebral edema and the prevention of cerebral hernia; lowering intraocular pressure, which can be applied to the preoperative preparation of intraocular surgery; osmotic diuresis, which can be used for the prevention of acute renal tubular necrosis caused by various reasons; the drug can also be used as an adjunctive treatment for nephrotic syndrome, cirrhotic ascites and other diseases. Mannitol injection may appear after the use of water electrolyte disorders, chills, urinary difficulties, thirst and other adverse reactions; acute tubular necrosis of anuria, severe water loss, intracranial active hemorrhage, acute pulmonary edema and other patients are prohibited, it is recommended that patients strictly comply with the doctor’s instructions to use the drug.