August 24, 2016
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GAMMAGARD S/D, Immune Globulin Intravenous (Human), contains a broad spectrum of IgG antibodies against bacterial and viral agents that are capable of opsonization and neutralization of microbes and toxins.

Peak levels of IgG are reached immediately after infusion of GAMMAGARD S/D (immune globulin) . It has been shown that, after infusion, exogenous IgG is distributed relatively rapidly between plasma and extravascular fluid until approximately half is partitioned in the extravascular space. Therefore, a rapid initial drop in serum IgG levels is to be expected.4 As a class, IgG survives longer in vivo than other serum proteins.4,5 Studies show that the half-life of GAMMAGARD S/D (immune globulin) is approximately 37.7 15 days.3 Previous studies reported IgG half-life values of 21 to 25 days.4,5 using radiolabeled IgG or 17.7 to 37.6 days measuring IgG levels during administration of IGIV to immunodeficient patients.6 The half-life of IgG can vary considerably from person to person, however. In particular, high concentrations of IgG and hypermetabolism associated with fever and infection have been seen to coincide with a shortened half-life of IgG. 4-7


3. Unpublished data in the files of Baxter Healthcare Corporation.

4. Waldmann TA, Storber W. Metabolism of immunoglobulins. Prog Allergy. 1969;13:1-110.

5. Morell A, Riesen W. Structure, function and catabolism of immunoglobulins. In: Nydegger UE, ed. Immunotherapy. London: Academic Press; 1981;17-26.

6. Mankarious S, Lee M, Fischer S, Pyun KH, Ochs HD, Oxelius VA, Wedgwood RJ. The half-lifes of IgG subclasses and specific antibodies in patients with primary immunodeficiency who are receiving intravenously administered immunoglobulin. J Lab Clin Med. 1988; 112:634-40.

7. Buckley RH. Immunoglobulin replacement therapy: Indications and contraindications for use and variable IgG levels achieved In: Alving BM, Finlayson JS eds. Immunoglobulins: characteristics and use of intravenous preparations. Washington, D.C.: US Department of Health and Human Services; 1979;3-8.

Last reviewed on RxList: 9/8/2008
This monograph has been modified to include the generic and brand name in many instances.

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