静脉注射免疫球蛋白是一种用于静脉注射的血液制品，注射后其效果可以持续2周至3个月。它是一种从上千献血者所捐献的血浆中提取出来，并汇聚到一起的非特效丙种免疫球蛋白（G型抗体）。主要用于以下三个大场景：

Immunoglobulin therapy is therapy with antibody (immunoglobulin) mixtures, given via intravenous, subcutaneous, or intramuscular routes of administration, used to treat or prevent a variety of diseases. Immunoglobulin as used in infusions contains the pooled polyvalent IgG antibodies extracted from the plasma of thousands of blood donors. The effects of immunoglobulin generally last between two weeks and three months, although most subcutaneous brands of immunoglobulin are designed to be administered 1–2 times a week, and for most purposes intravenous immunoglobulin is administered once every 3–4 weeks. One currently marketed preparation of subcutaneous immunoglobulin, HyQvia, uses hyaluronidase in order to allow for greater injection volumes and thus less frequent administration times than other forms of subcutaneous immunoglobulin (once every 3–4 weeks.) Additionally, some diseases, such as myasthenia gravis may only require immunoglobulin treatment once every 3–4 months.