Methylprednisolone, is an organic compound, molecular formula is C22H30O5, has strong anti-inflammatory effect. Methylprednisolone has strong anti-inflammatory effect and weak sodium retention effect, and its anti-inflammatory effect is 7 times that of cortisone. Sodium methylprednisolone succinate is a water-soluble derivative of prednisolone, which is transformed into methylprednisolone in the body. It can be injected, has rapid effect and medium maintenance time, and is the preferred drug for the treatment of inflammation and allergy. Acetate was a suspension, and the effect was slow and lasting after injection. Methylprednisolone is a medium effective glucocorticoid. The effect is the same as prednisolone, its anti-inflammatory effect is 3 times of the latter, sugar metabolism is 10 times stronger than hydrocortisone, and water and sodium retention is weak, no side effects of potassium discharge. After intramuscular injection, the acetate suspension was decomposed and absorbed slowly and maintained for a long time. After intramuscular injection for 6-8h, the average peak concentration was 14.8μg/L, which could be maintained for 11-17 days. Its sodium succinate is water-soluble, can be intramuscular or intravenous infusion