Rho(D) Immune Globulin is a meicine given by intramuscular injection which is used to prevent the immunological condition known as Rhesus disease (or hemolytic disease of newborn). The medicine is a solution of IgG anti-D (anti-RhD) antibodies which bind to, and lead to the destruction of, fetal Rh D positive red blood cells that have passed from the fetal circulation to the maternal circulation. Therefore, in a Rhesus negative mother it can prevent sensitization of the maternal immune system to Rh D antigens, which can cause rhesus disease in the current or in subsequent pregnancies. With the widespread use of Rho(D) Immune Globulin, Rh disease of the fetus and newborn has almost disappeared. It can also be used in the treatment of idiopathic thrombocytopenic purpura in Rhesus positive patients.