IVIG stands for intravenous immunoglobulin. It is a purified plasma treatment that contains antibodies collected from the plasma of healthy donors and purified through a special process so that the therapy is safe and effective. Most of the antibodies are of the IgG class of antibodies, also called immunoglobulin G or gamma globulin which neutralizes toxins that cause bacterial and viral infections. This set of immunogenic response, pooled from thousands of patients, can be used to treat diseases where the patient has less than a normal functioning immune system or, conversely, for patients that have an overly active immune system that is attacking parts of the patients own body.