April 27, 2017
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"The U.S. Food and Drug Administration today approved Coagadex, Coagulation Factor X (Human), for hereditary Factor X (10) deficiency. Until today’s orphan drug approval, no specific coagulation factor replacement therapy was available for p"...



[Coagulation Factor IX (Recombinant)] for Intravenous Injection


RIXUBIS [Coagulation Factor IX (Recombinant)] is a purified protein produced by recombinant DNA technology. Its amino acid sequence is identical to that of the Ala-148 allelic form of plasma derived factor IX, and its structural and functional characteristics are similar to those of plasma derived factor IX. RIXUBIS is produced by a genetically engineered CHO cell line. No human or animal proteins are added during any stage of manufacturing or formulation of RIXUBIS. The CHO cell line secretes recombinant factor IX into a defined cell culture medium that does not contain hormones, and the recombinant factor IX is purified by a chromatography purification process that does not require a monoclonal antibody step. The process includes validated virus inactivation/removal steps, namely solvent/detergent treatment and 15 nm nanofiltration. RIXUBIS is predominantly a single component by sodium dodecyl sulfate-polyacrylamide gel electrophoresis evaluation. The specific activity of RIXUBIS is ≥ 200 international units per milligram of protein. Factor IX preactivation, the percent of Factor IXa/Factor IX as measured by activity assays, is ≤ 0.03%. The potency in international units is determined using an in vitro thromboplastin time (aPTT)-based one-stage clotting assay calibrated against the World Health Organization (WHO) International Standard for Factor IX concentrate. Factor IX potency results can be affected by the type of aPTT reagent and reference standard used in the assay; differences of up to 40% have been observed.

RIXUBIS is formulated as a sterile, nonpyrogenic lyophilized powder to be reconstituted with Sterile Water for Injection for intravenous administration. It does not contain any preservatives and is available in single-use vials containing the labeled amount of factor IX activity, expressed in international units. Each vial contains nominally 250, 500, 1000, 2000 or 3000 international units of recombinant coagulation factor IX. After reconstitution of the lyophilized powder, all dosage strengths yield a clear, colorless solution. The concentrations of excipients are:

Excipient Concentration
L-histidine 20 mM
sodium chloride 60 mM
calcium chloride 4 mM
Mannitol 110 mM
Sucrose 35 mM
polysorbate 80 0.005%

Last reviewed on RxList: 2/29/2016
This monograph has been modified to include the generic and brand name in many instances.

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