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Antihemophilic Factor/ Von Willebrand Factor Complex (Human) contains Antihemophilic Factor (FVIII) and von Willebrand Factor (VWF), constituents of normal plasma, which are required for clotting. The administration of Alphanate temporarily increases the plasma level of FVIII, thus minimizing the hazard of hemorrhage in patients with hemophilia A. FVIII is an essential cofactor in activation of factor X leading to formation of thrombin and fibrin. VWF promotes platelet aggregation and platelet adhesion on damaged vascular endothelium; it also serves as a stabilizing carrier protein for the procoagulant protein FVIII.