Intravenous immune globulin is used to strengthen the body's immune system, according to WebMD. It works by reducing the risk of infections in those with a weakened immune system.
Intravenous immune globulin is also used for increasing blood count in people with a certain blood disorder known as idiopathic thrombocytopenia purpura-ITP, by eliminating bleeding and forming blood clots, explains WebMD. Intravenous immune globulin is also occasionally used to treat multifocal motor neuropathy and Kawasaki syndrome.
Intravenous immune globulin is a sterile solution of concentrated antibodies taken from healthy donors. It is derived from a portion of the blood, known as plasma, where the immune globulins and other proteins are contained, according to BPI Pharma. For those being treated, regular infusions are required to maintain a healthy range of immune globulin levels in the body.