ANTHRASIL Solution for infusion Ref.[9986] Active ingredients: Anthrax immunoglobulin

ANTHRASIL, Anthrax Immune Globulin Intravenous (Human), is a sterile solution of purified human immune globulin G (IgG) containing polyclonal antibodies that bind the protective antigen (PA) component of Bacillus anthracis lethal and edema toxins. It is stabilized with 10% maltose and 0.03% polysorbate 80 (pH is between 5.0 and 6.5) and contains no preservative. The product is a clear or slightly opalescent colorless liquid, free of foreign particles, supplied in a 50 mL vial with variable fill volume. The total protein concentration ranges from 40 to 70 mg per mL. An adult dosage of 420 units (seven vials) of ANTHRASIL contains up to 0.368 g protein per kg body weight, and an adult dosage of 840 units (14 vials) contains up to 0.736 g protein per kg body weight. The protein load exposure to pediatric patients due to ANTHRASIL administration may range from 0.32 to 1.26 g per kg of body weight, depending on the weight-based pediatric dose.

ANTHRASIL is prepared using plasma collected from healthy, screened donors who were immunized with BioThrax (Anthrax Vaccine Adsorbed) to achieve high titers of anti-anthrax antibody (meeting minimum potency specifications) and purified by an anion-exchange column chromatography method. The source plasma is tested by FDA licensed nucleic acid testing (NAT) for human immunodeficiency virus-1 (HIV-1), hepatitis B virus (HBV) and hepatitis C virus (HCV). Plasma also was tested by in-process NAT for hepatitis A virus (HAV) and parvovirus B19 (B19) via minipool testing; the limit for B19 in the manufacturing pool is set not to exceed 10⁴ International Units of B19 DNA per mL.

The manufacturing process contains two steps implemented specifically for virus clearance. The solvent and detergent step (using tri-n-butyl phosphate and Triton X-100) is effective in the inactivation of enveloped viruses such as HBV, HCV and HIV. Virus filtration, using a Planova 20N virus filter, is effective for the removal of viruses based on their size, including some non-enveloped viruses. These two viral clearance steps are designed to increase product safety by reducing the risk of transmission of enveloped and non-enveloped viruses. In addition to these two specific steps, the process step of anion-exchange chromatography was identified as contributing to the overall viral clearance capacity for small non-lipid enveloped viruses.

The inactivation and reduction of known enveloped and non-enveloped model viruses were validated in laboratory studies as summarized in Table 2. The viruses employed for spiking studies were selected to represent those viruses that are potential contaminants in the product, and to represent a wide range of physiochemical properties in order to challenge the manufacturing process’s ability for viral clearance in general.

Table 2. Virus Reduction Values (Log₁₀) Obtained through Validation Studies:

Abbreviations:

BVDV = Bovine viral diarrhea virus; model virus for hepatitis C virus (HCV) and West Nile virus (WNV)
DNA = Deoxyribonucleic Acid
EMC = Encephalomyocarditis virus; model for HAV and for small non-enveloped viruses in general
HIV-1 = Human immunodeficiency virus-1; relevant virus for HIV-1 and model for HIV-2
HAV = Human hepatitis A virus; relevant virus for HAV and model for small non-enveloped viruses in general
MMV = Murine minute virus; model for human B19 parvovirus and for small non-enveloped viruses in general
n.e. = Not evaluated
PPV = Porcine parvovirus; model for human B19 parvovirus and for small non-enveloped viruses in general
PRV = Pseudorabies virus; model for large enveloped DNA viruses, including herpes
RNA = Ribonucleic Acid

The product potency, as determined by an in vitro toxin neutralization assay (TNA), is expressed in arbitrary units by comparison to a standard calibrated against the Centers for Disease Control and Prevention (CDC) Reference Serum standard. Each vial contains approximately 40 to 70 mg per mL total protein and ≥60 units of toxin neutralizing activity. The product contains ≤40 mcg per mL of immune globulin A (IgA) as well as residual amounts of solvent and detergent, which are used to inactivate lipid-enveloped viruses.