The dosage of dexamethasone intravenous drip for adults is 2-20mg, which can be adjusted according to body weight. Dexamethasone is a hormone drug with anti-inflammatory, anti-allergic and anti-shock effects, mainly used in acute allergy rescue, as well as leukemia, rheumatic diseases and bronchial asthma, etc. The application of dexamethasone for these diseases is advocated for short-term applications, and long-term applications are not recommended. Otherwise, the accumulation of a large number of human organs will cause strong side effects, such as large doses of application can cause diabetes, peptic ulcers, Cushing’s syndrome and so on. In addition, for some serious infections, the dosage of dexamethasone must be grasped, otherwise it is easy to develop femoral head necrosis and cause lifelong regret.