Medrol (Methylprednisolone) is used to treat many different inflammatory conditions such as arthritis, blood disorders, severe allergic reactions, certain cancers, eye conditions, skin/kidney/intestinal/lung diseases, and immune system disorders.  It decreases your immune system's response to various diseases to reduce symptoms such as swelling, pain, and allergic-type reactions.  This medication is a corticosteroid hormone. Medrol may also be used with other medications in hormone disorders.