Methylprednisolone, a naturally occurring glucocorticoid (hydrocortisone and cortisone), which has also salt-retaining properties, is used as replacement therapy in adrenocortical deficiency states. This synthetic analog is primarily used for its potent anti-inflammatory effects in disorders of many organ systems. The intravenous injection of Methylprednisolone Sodium Succinate, demonstrable effects are evident within one hour and persist for a variable period. Excretion of the administered dose is nearly complete within 12 hours. Thus, if constantly high blood levels are required, injections should be made every 4 to 6 hours. This preparation is also rapidly absorbed when administered intramuscularly and is excreted in a pattern similar to that observed after intravenous injection. Its anti-inflammatory potency is greater than prednisolone in the ratio of 5 to 4. It has only minimal mineralocorticoid properties and has less tendency than prednisolone to induce sodium and water retention. It influences carbohydrate, protein, fat and purine metabolism, electrolyte and water balance, and the functional capacities of the cardiovascular system, the kidney, the skeletal muscle, nervous system and other organs and tissues. It exerts a suppressive effect on the immune response.