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Kogenate (Antihemophilic Factor (Recombinant)) - Warnings and Precautions






Kogenate® FS Antihemophilic Factor (Recombinant) is intended for the treatment of bleeding disorders arising from a deficiency in FVIII. This deficiency should be proven prior to administering Kogenate FS.

The development of circulating neutralizing antibodies to FVIII may occur during the treatment of patients with hemophilia A. Inhibitor formation is especially common in young children with severe hemophilia during their first years of treatment, or in patients of any age who have received little previous treatment with FVIII. Nonetheless, inhibitor formation may occur at any time in the treatment of a patient with hemophilia A. Patients treated with any AHF preparation, including Kogenate FS, should be carefully monitored for the development of antibodies to FVIII by appropriate clinical observation and laboratory tests, according to the recommendation of the patient's hemophilia treatment center.

Among patients treated with antihemophilic factor concentrates, cases of hypotension, urticaria, and chest tightness in association with hypersensitivity reactions have been reported in the literature.11-13 Very rare cases of allergic and anaphylactic reactions have been reported with the predecessor product KOGENATE® Antihemophilic Factor (Recombinant), particularly in very young patients or patients who have previously reacted to other FVIII concentrates (see ADVERSE REACTIONS -- Post-marketing experience). Serious anaphylactic reactions require immediate emergency treatment with resuscitative measures such as the administration of epinephrine and oxygen.


Assays to detect seroconversion to mouse and hamster protein were conducted on all patients in clinical studies. No patient has developed specific antibodies to these proteins after commencing study, and no animal protein associated serious allergic reactions have been observed with rFVIII-FS infusions. Although no such reactions were observed, patients should be made aware of the possibility of a hypersensitivity reaction to mouse and/or hamster protein, and alerted to the early signs of such a reaction (e.g., hives, localized or generalized urticaria, wheezing, and hypotension). Patients should be advised to discontinue use of the product and contact their physician if such symptoms occur.


In vitro evaluation of the mutagenic potential of rFVIII failed to demonstrate reverse mutation or chromosomal aberrations at doses substantially greater than the maximum expected clinical dose. In vivo evaluation of rFVIII in animals using doses ranging between 10 and 40 times the expected clinical maximum also indicated that rFVIII does not possess a mutagenic potential. Long-term investigations of carcinogenic potential in animals have not been performed.


Kogenate FS is appropriate for use in pediatric patients of all ages, including neonates, infants, children, and adolescents. Safety and efficacy studies have been performed in previously untreated and minimally treated pediatric patients (n = 62). Kogenate FS is similar to KOGENATE® Antihemophilic Factor (Recombinant) in its biological activity and may be used in pediatric patients in the same manner as KOGENATE.


Clinical studies with Kogenate FS did not include sufficient numbers of patients aged 65 and over to be able to determine whether they respond differently from younger patients. However, clinical experience with KOGENATE and other AHF products has not identified differences between the elderly and younger patients. As with any patient receiving Kogenate FS, dose selection for an elderly patient should be individualized.


Animal reproduction studies have not been conducted with Kogenate FS. It is also not known whether Kogenate FS can cause fetal harm when administered to a pregnant woman or affect reproduction capacity. Kogenate FS should be used during pregnancy and lactation only if clearly indicated.


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Page last updated: 2006-08-12

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