Gammagard is a sterilized solution from human plasma. It has antibodies that assist the body to protect itself from various diseases' infections. Gammagard is available in generic form as immune globulin and belongs to the drug class immune globulins. It is available in different brand names such as Privigen, Octagam, Gammaplex, Gammar-P I.V., Gamunex, Carimune, and Flebogamma. Gammagard treats primary immunodeficiency, PI and multifocal motor neuropathy, MMN.