DESCRIPTION Hepatitis B Immune Globulin (Human), Nabi-HB, is a sterile solution of immunoglobulin (5 1 percent protein) containing antibodies to hepatitis B surface antigen (anti-HBs). It is prepared from plasma donated by individuals with high titers of anti-HBs. The plasma is processed using a modified Cohn 6 Oncley 9 cold-alcohol fractionation process1, 2 with two added viral reduction steps described below. Nabi-HB is formulated in 0.042-0.108 M sodium chloride, 0.10-0.20 M glycine, and 0.005-0.050 percent polysorbate 80, at pH 5.8-6.5. The product is supplied as a nonturbid sterile liquid in single dose vials and appears as clear to opalescent. It contains no preservative and is intended for single use by the intramuscular route only. Each plasma donation used for the manufacture of Nabi-HB is tested for the presence of hepatitis B virus (HBV) surface antigen (HBsAg), human immunodeficiency viruses (HIV) 1/2, and hepatitis C virus (HCV) antibodies. In addition, pooled samples of Source Plasma used in the manufacture of this product are tested by FDA licensed Nucleic Acid Testing (NAT) for HIV and HCV and found to be negative. Investigational NAT for hepatitis A virus (HAV) and HBV is also performed on pooled samples of all Source Plasma used, and found to be negative; however, the significance of a negative result has not been established. Investigational NAT for parvovirus B19 (B19) is also performed on pooled samples of all Source Plasma and the limit for B19 DNA in a manufacturing pool is set not to exceed 104 IU/mL. The manufacturing steps for Nabi-HB are designed to reduce the risk of transmission of viral disease. The solvent/detergent treatment step, using tri-n-butyl phosphate and Triton X-100, is effective in inactivating known enveloped viruses such as hepatitis B virus (HBV), hepatitis C virus (HCV), and human immunodeficiency virus (HIV) 3. Virus filtration, using a Planova 35 nm Virus Filter, is effective in reducing some known enveloped and non-enveloped viruses4. The inactivation and reduction of known enveloped and non-enveloped model viruses were validated in laboratory studies as summarized in the following table
Table 1 Log Reduction of Test Viruses5 Test Virus HIV BVD PRV EMC PPV
Model Virus: HIV HCV HBV Hepatitis A PVB19
Envelope/Genome: Yes/RNA Yes/RNA Yes/DNA No/RNA No/DNA
Manufacturing Step
Precipitation of Cohn
Fraction III Greater than 5.9 3.6 3.7 4.4 3.9
Cuno Filtration NT NT NT Greater than 6.6 5.4
Solvent/Detergent Greater than 4.2 Greater than 6.9 Greater than 6.4 NT NT
Nanofiltration Greater than 7.4 Greater than 6.9 Greater than 5.7 3.0 0.7
Cumulative Greater than 17.5 Greater than 17.4 Greater than 15.8 Greater than 14.0 9.3

BVD Bovine Viral Diarrhea Virus PVB19 Parvovirus B19 NT not tested EMC Encephalomyocarditis Virus PPV Porcine Parvovirus Value not included in HIV Human Immunodeficiency Virus PRV Pseudorabies Virus cumulative clearance Product potency is expressed in international units (IU) by comparison to the World Health Organization (WHO) standard. Each milliliter (mL) of product contains greater than 312 IU anti- HBs. The potency of each milliliter of Nabi-HB exceeds the potency of anti-HBs in a U.S. reference hepatitis B immune globulin (FDA). The U.S. reference has been tested by Biotest Pharmaceuticals against the WHO standard and found to be equal to 208 IU/mL.

CLINICAL PHARMACOLOGY Hepatitis B Immune Globulin (Human) products provide passive immunization for individuals exposed to the hepatitis B virus as evidenced by a reduction in the attack rate of hepatitis B following use6-9. Clinical studies10,11 conducted prior to 1983 with hepatitis B immune globulins similar to Nabi-HB indicate the advantage of simultaneous administration of hepatitis B vaccine and Hepatitis B Immune Globulin (Human). The Centers for Disease Control and Prevention Advisory Committee on Immunization Practices (ACIP) advises that the combination prophylaxis be provided in certain instances of exposure based upon the increased efficacy found with that regimen in neonates12. Cases of hepatitis B are rarely seen following exposure to HBV in persons with preexisting anti-HBs. However, no prospective studies have been performed on the efficacy of concurrent hepatitis B vaccine and Hepatitis B Immune Globulin (Human) administration following parenteral exposure, mucous membrane contact, or oral ingestion in adults. Infants born to HBsAg-positive mothers are at risk of being infected with HBV and becoming chronic carriers13. The risk is especially great if the mother is also HBeAg-positive14. Studies conducted with hepatitis B immune globulins similar to Nabi-HB indicated that for an infant with perinatal exposure to an HBsAg-positive and HBeAg-positive mother, a regimen combining one dose of Hepatitis B Immune Globulin (Human) at birth with the hepatitis B vaccine series started soon after birth is 85-98percent effective in preventing development of the HBV carrier state15-17. Regimens involving either multiple doses of Hepatitis B Immune Globulin (Human) alone or the vaccine series alone have a 70-90percent efficacy, while a single dose of Hepatitis B Immune Globulin (Human) alone has 50percent efficacy18. Since infants have close contact with primary caregivers and they have a higher risk of becoming HBV carriers after acute HBV infection, prophylaxis of an infant less than 12 months of age with Hepatitis B Immune Globulin (Human) and hepatitis B vaccine is indicated if the mother or primary caregiver has acute HBV infection19. Sexual partners of HBsAg-positive persons are at increased risk of acquiring HBV infection. A single dose of Hepatitis B Immune Globulin (Human) is 75percent effective if administered within two weeks of the last sexual exposure to a person with acute hepatitis B19.

Pharmacokinetics Pharmacokinetics trials20 of Nabi-HB, Hepatitis B Immune Globulin (Human), given intramuscularly to 50 healthy volunteers demonstrated pharmacokinetic parameters similar to those reported by Scheiermann and Kuwert21. The half-life for Nabi-HB was 23.1 5.5 days. The clearance rate was 0.35 0.12 L/day and the volume of distribution was 11.2 3.4 L. Maximum concentration of Nabi-HB was reached in 6.5 4.3 days. The maximum concentration of anti-HBs and the area under the time-concentration curve achieved by Nabi-HB were bioequivalent to that of another licensed Hepatitis B Immune Globulin (Human) when compared in the same pharmacokinetics trial. Comparability of pharmacokinetics between Nabi-HB and a commercially available hepatitis B immunoglobulin indicate that similar efficacy of Nabi-HB should be inferred.

INDICATIONS AND USAGE Nabi-HB, Hepatitis B Immune Globulin (Human), is indicated for treatment of acute exposure to blood containing HBsAg, perinatal exposure of infants born to HBsAg-positive mothers, sexual exposure to HBsAg-positive persons and household exposure to persons with acute HBV infection in the following settings: Acute Exposure to Blood Containing HBsAg Following either parenteral exposure (needlestick, bite, sharps), direct mucous membrane contact (accidental splash), or oral ingestion (pipetting accident), involving HBsAg-positive materials such as blood, plasma, or serum. Perinatal Exposure of Infants Born to HBsAg-positive Mothers Infants born to mothers positive for HBsAg with or without HBeAg12. Sexual Exposure to HBsAg-positive Persons Sexual partners of HBsAg-positive persons. Household Exposure to Persons with Acute HBV Infection Infants less than 12 months old whose mother or primary caregiver is positive for HBsAg. Other household contacts with an identifiable blood exposure to the index patient. Nabi-HB is indicated for intramuscular use only.

CONTRAINDICATIONS Individuals known to have had an anaphylactic or severe systemic reaction to human globulin should not receive Nabi-HB, Hepatitis B Immune Globulin (Human), or any other human immune globulin. Nabi-HB contains not more than 40 micrograms per mL IgA. Individuals who are deficient in IgA have the potential to develop antibodies against IgA and anaphylactic reactions. The physician must weigh the potential benefit of treatment with Nabi-HB against the potential for hypersensitivity reactions.

WARNINGS In patients who have severe thrombocytopenia or any coagulation disorder that would contraindicate intramuscular injections, Nabi-HB, Hepatitis B Immune Globulin (Human), should be given only if the expected benefits outweigh the potential risks. Nabi-HB is made from human plasma. Products made from human plasma may contain infectious agents, e.g., viruses, and theoretically, the Creutzfeldt-Jakob disease (CJD) agent. The risk that such products can transmit an infectious agent has been reduced by screening plasma donors for prior exposure to certain viruses, by testing for the presence of certain current viral infections, and by inactivating and/or reducing certain viruses. The Nabi-HB manufacturing process includes a solvent/detergent treatment step (using tri-n-butyl phosphate and Triton X-100) that is effective in inactivating known enveloped viruses such as HBV, HCV, and HIV. Nabi-HB is filtered using a Planova 35 nm Virus Filter that is effective in reducing the levels of some enveloped and non-enveloped viruses. These two processes are designed to increase product safety. Despite these measures, such products can still potentially transmit disease. There is also the possibility that unknown infectious agents may be present in such products. ALL infections thought by a physician possibly to have been transmitted by this product should be reported by the physician or other health care provider to Biotest Pharmaceuticals at 1-800-458-4244. The physician should discuss the risks and benefits of this product with the patient.

PRECAUTIONS General Nabi-HB, Hepatitis B Immune Globulin (Human), must be administered only intramuscularly for post-exposure prophylaxis. The preferred sites for intramuscular injections are the anterolateral aspect of the upper thigh and the deltoid muscle. If the buttock is used due to the volume to be injected, the central region should be avoided only the upper, outer quadrant should be used, and the needle should be directed anterior (i.e., not inferior or perpendicular to the skin) to minimize the possibility of involvement with the sciatic nerve22. The 50 healthy volunteers who received Nabi-HB in pharmacokinetic studies were followed for 84 days for possible development of anti-HCV antibodies. No subject seroconverted.

Drug Interactions Vaccination with live virus vaccines should be deferred until approximately three months after administration of Nabi-HB, Hepatitis B Immune Globulin (Human). It may be necessary to revaccinate persons who received Nabi-HB shortly after live virus vaccination. There are no available data on concomitant use of Nabi-HB and other drugs; therefore, Nabi- HB should not be mixed with other drugs.

Pregnancy Category C Animal reproduction studies have not been conducted with Nabi-HB. It is also not known whether Nabi-HB can cause fetal harm when administered to a pregnant woman or can affect a woman's ability to conceive. Nabi-HB should be given to a pregnant woman only if clearly indicated.

Nursing Mothers It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when Nabi-HB is administered to a nursing mother.

Pediatric Use Safety and effectiveness in the pediatric population have not been established for Nabi-HB. However, the safety and effectiveness of similar hepatitis B immune globulins have been demonstrated in infants and children12.

Geriatric Use Clinical studies of Nabi-HB did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently than younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients.

ADVERSE REACTIONS Fifty male and female volunteers received Nabi-HB, Hepatitis B Immune Globulin (Human), intramuscularly in pharmacokinetics trials20. The number of patients with reactions related to the administration of Nabi-HB included local reactions such as erythema 6 (12percent) and ache 2 (4percent) at the injection site, as well as systemic reactions such as headache 7 (14percent), myalgia 5 (10percent), malaise 3 (6percent), nausea 2 (4percent), and vomiting 1 (2percent). The majority (92percent) of reactions were reported as mild. The following adverse events were reported in the pharmacokinetics trials and were considered probably related to Nabi-HB: elevated alkaline phosphatase 2 (4percent), ecchymosis 1 (2percent), joint stiffness 1 (2percent), elevated AST 1 (2percent), decreased WBC 1 (2percent), and elevated creatinine 1 (2percent). All adverse events were mild in intensity. There were no serious adverse events. No anaphylactic reactions with Nabi-HB have been reported. However, these reactions, although rare, have been reported following the injection of human immune globulins23.

OVERDOSAGE Although no data are available, clinical experience reported with other human immune globulins suggests that the only manifestations of overdose with Nabi-HB, Hepatitis B Immune Globulin (Human), would be pain and tenderness at the injection site.

DOSAGE AND ADMINISTRATION This product is for intramuscular use only. The use of this product by the intravenous route is not indicated. Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration. It is important to use a separate vial, sterile syringe, and needle for each individual patient, in order to prevent transmission of infectious agents from one person to another. Any vial of Nabi- HB, Hepatitis B Immune Globulin (Human) that has been entered should be used promptly. Do not reuse or save for future use. This product contains no preservative; therefore, partially used vials should be discarded immediately. Hepatitis B Immune Globulin (Human) may be administered at the same time (but at a different site), or up to one month preceding hepatitis B vaccination without impairing the active immune response to hepatitis B vaccine11. Acute Exposure to Blood Containing HBsAg Table 2 summarizes prophylaxis for percutaneous (needlestick, bite, sharps), ocular, or mucous membrane exposure to blood according to the source of exposure and vaccination status of the exposed person. For greatest effectiveness, passive prophylaxis with Hepatitis B Immune Globulin (Human) should be given as soon as possible after exposure, as its value after seven days following exposure is unclear12. An injection of 0.06 mL/kg of body weight should be administered intramuscularly as soon as possible after exposure and within 24 hours, if possible. Consult the hepatitis B vaccine package insert for dosage information regarding the vaccine. For persons who refuse hepatitis B vaccine or are known non-responders to vaccine, a second dose of Hepatitis B Immune Globulin (Human) should be given one month after the first dose12.

HOW SUPPLIED Nabi-HB, Hepatitis B Immune Globulin (Human), is supplied as:

NDC Number Contents 59730-4202-1 a carton containing a 1 mL dose in a single-use vial (>312 IU) and package insert

59730-4203-1 a carton containing a 5 mL dose in a single-use vial (>1560 IU) and package insert

STORAGE

Refrigerate between 2 to 8 C (36 to 46 F). Do not freeze. Do not use after expiration date. Use within 6 hours after the vial has been entered.

REFERENCES

1. Cohn E.J., Strong W.L., Mulford D.J., Ashworth J.N., Melin M., Taylor H.L. Preparation and Properties of Serum and Plasma Proteins IV. A system for the separation into fractions of the protein and lipoprotein components of biological tissues and fluids. J Am Chem Soc 1946, 68: 459-475.

2. Oncley J.L, Melin M, Richert D.A, Cameron J. W, Gross P.M. The separation of antibodies, isoagglutinins, prothrombin, plasminogen and b1-lipoproteins into sub-fractions of human plasma. J Am Chem Soc 1949, 71:541-550.

3. Horowitz B: Investigations into the application of tri(n-butyl)phosphate/detergent mixtures to blood derivatives. Morgenthaler J (ed): Virus Inactivation in Plasma Products, Curr Stud Hematol Blood Transfus 1989; 56:83-96.

4. Burnouf T: Value of virus filtration as method for improving the safety of plasma products. Vox Sang 1996; 70:235-236.

5. Unpublished data on file, Viral Validation Study Reports, Biotest Pharmaceuticals.

6. Grady GF, and Lee VA: Hepatitis B immune globulin - prevention of hepatitis from accidental exposure among medical personnel. N Engl J Med 1975; 293:1067-1070.

7. Seeff LB, et al.: Type B hepatitis after needle-stick exposure: Prevention with hepatitis B immune globulin. Ann Int Med 1978; 88:285-293.

8. Krugman S, and Giles JP: Viral hepatitis, type B (MS-2-strain). Further observations on natural history and prevention. N Engl J Med 1973; 288:755-760.

9. Hoofnagle JH, et al.: Passive - active immunity from hepatitis B immune globulin. Ann Int Med 1979; 91:813-818.

10. Beasley RP, et al.: Efficacy of hepatitis B immune globulin for prevention of perinatal transmission of the hepatitis B virus carrier state: Final report of a randomized doubleblind, placebo - controlled trial. Hepatology 1983; 3:135-141.

11. Szmuness W, et al.: Passive active immunisation against hepatitis B: Immunogenicity studies in adult Americans. Lancet 1981; 1:575-577.

12. Centers for Disease Control: Recommendations for protection against viral hepatitis. Recommendations of the Immunization Practices Advisory Committee (ACIP). MMWR 1985; 34(22):313-335.

13. Shiraki Y, et al.: Hepatitis B surface antigen and chronic hepatitis in infants born to asymptomatic carrier mothers. Am J Dis Child 1977; 131:644-647.

14. Beasley RP, et al.: The e antigen and vertical transmission of hepatitis B surface antigen. Am J Epidemiol 1977; 105:94-98.

15.Wong VCW, et al.: Prevention of the HBsAg carrier state in newborn infants of mothers who are chronic carriers of HBsAg and HBeAg by administration of hepatitis B vaccine and hepatitis B immunoglobulin: Double-blind randomized placebo-controlled study. Lancet 1984; 1:921-926.

16. Poovorawan Y, et al.: Long term hepatitis B vaccine in infants born to hepatitis B e antigen positive mothers. Archives of Diseases in Childhood 1997; 77:F47-F51.

17. Stevens CE, et al.: Perinatal Hepatitis B virus transmission in the United States: Prevention by passive-active immunization. JAMA 1985; 253:1740-1745.

18. Jhaveri R, et al.: High titer multiple dose therapy with HBIG in newborn infants of HBsAg positive mothers. J Pediatr 1980; 97:305-308.

19. Centers for Disease Control: Hepatitis B virus: A comprehensive strategy for eliminating transmission in the United States through universal childhood vaccination. Recommendations of the Immunization Practices Advisory Committee (ACIP). MMWR 1991; 40(13):1-25.

20. Data on file, Biotest Pharmaceuticals.

21. Scheiermann N, Kuwert EK: Uptake and elimination of hepatitis B immunoglobulins after intramuscular application in man. Develop Biol Standard 1983; 54:347.

22. Centers for Disease Control: General recommendations on immunization. Recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR 1994; 43:1-38.

23. Ellis EF, Henney CS: Adverse reactions following administration of human gamma globulin. J Allerg 1969; 43:45-54.

Manufactured by: Biotest Pharmaceuticals Corporation Boca Raton, FL 33487 U.S. License No. 1792 April 2008