Dexamethasone to lower cranial pressure cannot be used all the time. Dexamethasone belongs to long-acting glucocorticoid drugs, which can reduce cerebral edema and intracranial pressure. However, it cannot be used for a long time, and long-term use of dexamethasone has more side effects and harm to patients. Long-term use of dexamethasone may cause disorders of glucose metabolism in the body, hyperglycemia, causing hormonal diabetes; long-term use of dexamethasone can also increase the secretion of pepsin and gastric acid, increasing the prevalence of gastric ulcers; dexamethasone also inhibits intestinal calcium absorption, accelerating the loss of calcium, long-term use of which can lead to calcium deficiency and osteoporosis. In addition, long-term use of dexamethasone may lead to increased blood pressure, obesity, easy to infection, so can not be long-term use of dexamethasone to lower cranial pressure. Patients with high cranial pressure should go to the hospital in time, with the help of the doctor for regular treatment. All drugs should be used under the guidance of a doctor.