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As with the intravenous administration of other plasma-derived products, the following reactions may be observed following administration: headache, fever, chills, flushing, nausea, vomiting, tingling, lethargy, hives, stinging or burning at the infusion site or manifestations of allergic reactions. In a clinical study with Mononine® (coagulation factor ix (human)) in previously untreated hemophilia Bpatients, five patients experienced ALTelevations. Serologic tests for hepatitis A, hepatitis B, hepatitis C, Cytomegalovirus, and Epstein-Barr virus were negative.

The following adverse reactions have been spontaneously reported during post-marketing use of Mononine® (coagulation factor ix (human)) as well as other Factor IX products:anaphylaxis, angioedema, cyanosis, dyspnea, hypotension, thrombosis, inadequate therapeutic response, and inhibitor development.

There is a potential risk of thromboembolic episodes following the administration of Mononine® (see WARNINGS and PRECAUTIONS).

The patient should be monitored closely during the infusion of Mononine® (coagulation factor ix (human)) to observe for the development of any reaction. If any reaction takes place that is thought to be related to the administration of Mononine® (coagulation factor ix (human)) , the rate of infusion should be decreased or the infusion stopped, as dictated by the response of the patient. Should evidence of an acute hypersensitivity reaction be observed, the infusion should be stopped promptly and appropriate countermeasures and supportive therapy should be administered.