Medrol is a steroid that helps prevent the release of substances that cause inflammation in the body. It is used in treating conditions such as blood disorders, arthritis, certain types of cancers, allergic reactions,skin/intestinal/kidney/lung diseases, eye conditions, as well as immune system disorders. Further it helps decrease the response of immune systems to various diseases in order to reduce symptoms such as pain, swelling, and allergic type reactions. This form of medication is a corticosteroid hormone. Medrol may further be used with other medications in hormone disorders.