IG Therapy or Immunoglobulin therapy is the treatment with the mixtures of antibodies—immunoglobulin given intravenously, subcutaneously, or intramuscularly. This antibody helps to treat or prevent a wide range of diseases as its effects last between two weeks and three months. This can also be helpful to people who are unable to produce substantial amounts of IG or antibodies like patients with Wiskott Aldrich Syndrome and CVID.