Intravenous immunoglobulin (IVIG) is a medical treatment that involves administering a solution containing antibodies directly into a patient's bloodstream. These antibodies are derived from the plasma of healthy donors and help boost the immune system. IVIG is often used to treat various conditions, including autoimmune diseases, immunodeficiencies, and certain infections. The treatment is typically given through an intravenous (IV) line in a hospital or clinic setting. Patients may receive IVIG infusions regularly, depending on their specific health needs. While generally safe, some individuals may experience side effects, such as headaches or allergic reactions.