From Colorado State University's Hypertexts for Biomedical Sciences (http://arbl.cvmbs.colostate.edu/hbooks/pathphys/endocrine/adrenal/gluco.html):

"Glucocorticoids have potent anti-inflammatory and immunosuppressive properties.  This is particularly evident when they administered at pharmacologic doses, but also is important in normal immune responses. As a consequence, glucocorticoids are widely used as drugs to treat inflammatory conditions such as arthritis or dermatitis, and as adjunction therapy for conditions such as autoimmune diseases."