Azasan (Azathioprine) is a potent immunosuppressive antimetabolite indicated as an adjunct therapy for the prevention of rejection in renal homotransplantations and for the management of severe active rheumatoid arthritis. Immunosuppressants such as Azasan/Imuran (Azathioprine) are effective in helping to control the inflammatory process and thus reducing the need for chronic steroid treatment and its related adverse events.