Corticosteroids are used in several forms, to treat many different conditions. Because they reduce itching, swelling, redness, and allergic reactions, they are often used in treating skin problems, severe allergies, asthma, and arthritis. These drugs also suppress the body's immune response, so they are used in patients who have received organ transplants, to reduce the chance of rejection. In people whose bodies do not produce enough natural corticosteroids, the drugs can raise the levels of those hormones. Corticosteroids also are used to treat certain cancers (along with other drugs), and to reduce inflammation in other medical conditions.

Corticosteroids are medicines that are similar to the natural hormone cortisone. They affect many body processes, including the breakdown of protein, fat, and carbohydrate; the activity of the nervous system; the balance of salt and water; and the regulation of blood pressure. Because of their widespread effects, these drugs are useful...