2.1 Dose

A guide for dosing FEIBA is provided in Table 1.

• Dosage and duration of treatment depend on the location and extent of bleeding, and the patient's clinical condition. Careful monitoring of replacement therapy is necessary in cases of major surgery or life-threatening bleeding episodes.
• Each vial of FEIBA contains the labeled amount of factor VIII inhibitor bypassing activity in units.
• Base the dose and frequency of FEIBA on the individual clinical response. Clinical response to treatment with FEIBA may vary by patient and may not correlate with the patient's inhibitor titer.
• Record the name of the patient and batch number of the product in order to maintain a link between the patient and the batch of the product.
• Do not exceed a single dose of 100 units per kg body weight or a daily dose of 200 units per kg body weight [see Warnings and Precautions (5.1)].

2.2 Preparation and Reconstitution

• Use aseptic technique throughout the entire reconstitution process.
• If the patient uses more than one vial per injection, reconstitute each vial according to the following instructions.
  1. Allow the vials of FEIBA and Sterile Water for Injection (diluent) to reach room temperature, if refrigerated.
  2. Remove the plastic caps from the concentrate and diluent vials.
  3. Wipe the stoppers of both vials with a sterile alcohol swab and allow them to dry prior to use.
  4. Open the package of BAXJECT II Hi-Flow device by peeling away the lid completely without touching the inside (Fig. A). Do not remove the device from the package. Do not touch the clear spike.
  5. Place the diluent vial on a flat and solid surface. Turn the package over and insert the clear plastic spike through the diluent stopper by pressing straight down (Fig. B).
  6. Grip the BAXJECT II Hi-Flow device package at the edges and pull the package off the device (Fig. C). Do not remove the blue protective cap from the BAXJECT II Hi-Flow device. Do not touch the purple spike.
  7. Turn the system over, so that the diluent vial is on top. Quickly insert the purple spike of the BAXJECT II Hi-Flow device fully into the FEIBA vial. The vacuum will draw the diluent into the FEIBA vial (Fig. D). The connection of the two vials should be done expeditiously to close the open fluid pathway created by the first insertion of the spike to the diluent vial.
  8. Gently swirl (do not shake) the vial until FEIBA is completely dissolved. Make sure that FEIBA has been dissolved completely; otherwise, active material will not pass through the device filter. The reconstituted solution should be inspected visually for particulate matter before administration. The solution should be discarded if it is not clear or is discolored.
  9. After reconstitution of FEIBA is complete, the injection or infusion should begin immediately and must be completed within three hours following reconstitution. Do not refrigerate after reconstitution. Discard unused portion.

Figure A	Figure B
Figure C	Figure D

2.3 Administration

For intravenous injection or intravenous infusion after reconstitution only.

• Inspect the reconstituted FEIBA solution visually for particulate matter and discoloration prior to administration. The appearance of the solution should be colorless to slightly yellowish. Do not use if particulate matter or discoloration is observed.
• Flush venous access lines with isotonic saline prior to and after infusion of FEIBA. Do not administer in the same tubing or container with other medicinal products.
• Use plastic Luer lock syringes because protein such as FEIBA tends to stick to the surface of all-glass syringes.
  1. Remove the blue protective cap from the BAXJECT II Hi-Flow device. Tightly connect the syringe to the BAXJECT II Hi-Flow device (DO NOT DRAW AIR INTO THE SYRINGE) by turning the syringe in clockwise direction until stop position. Use of a Luer lock syringe is highly recommended to ensure a tight connection between the syringe and the BAXJECT II Hi-Flow device (Fig. E).
  2. Invert the system so that the dissolved FEIBA product is on top. Draw the dissolved product carefully into the syringe by pulling the plunger back slowly to avoid foaming (Fig. F).
  3. Ensure that the tight connection between the BAXJECT II Hi-Flow device and the syringe is maintained.
  4. Disconnect the syringe.
  5. Attach a suitable needle and inject or infuse intravenously at a rate that does not exceed 10 units per kg of body weight per minute. A syringe pump may be used to control the rate of administration. For a patient with a body weight of 75 kg, this corresponds to an infusion rate up to 15 mL per minute.

Figure E

Figure F

5.1 Embolic and Thrombotic Events

Thromboembolic events (including venous thrombosis, pulmonary embolism, myocardial infarction, and stroke) can occur with FEIBA, particularly following the administration of high doses (above 200 units per kg per day) and/or in patients with thrombotic risk factors [see Adverse Reactions (6)].

Patients with DIC, advanced atherosclerotic disease, crush injury, septicemia, or concomitant treatment with recombinant factor VIIa have an increased risk of developing thrombotic events due to circulating tissue factor or predisposing coagulopathy. Potential benefit of treatment with FEIBA should be weighed against the potential risk of these thromboembolic events.

Monitor patients receiving more than 100 units per kg of body weight of FEIBA for the development of DIC, acute coronary ischemia and signs and symptoms of other thromboembolic events. If clinical signs or symptoms occur, such as chest pain or pressure, shortness of breath, altered consciousness, vision, or speech, limb or abdomen swelling and/or pain, discontinue the infusion and initiate appropriate diagnostic and therapeutic measures.

The safety and efficacy of FEIBA for breakthrough bleeding in patients receiving emicizumab has not been established. Cases of thrombotic microangiopathy (TMA) were reported in a clinical trial where subjects received FEIBA as part of a treatment regimen for breakthrough bleeding following treatment with emicizumab.6 Consider the benefits and risks with FEIBA if considered required for patients receiving emicizumab prophylaxis. If treatment with FEIBA is required for patients receiving emicizumab, the hemophilia treating physician should closely monitor for signs and symptoms of TMA. In FEIBA clinical studies thrombotic microangiopathy (TMA) has not been reported.

5.2 Hypersensitivity Reactions

Hypersensitivity and allergic reactions, including severe anaphylactoid reactions, can occur following the infusion of FEIBA. The symptoms include urticaria, angioedema, gastrointestinal manifestations, bronchospasm, and hypotension. These reactions can be severe and systemic (e.g., anaphylaxis with urticaria and angioedema, bronchospasm, and circulatory shock). Other infusion reactions, such as chills, pyrexia, and hypertension have also been reported. If signs and symptoms of severe allergic reactions occur, immediately discontinue administration of FEIBA and provide appropriate supportive care.

5.3 Transmission of Infectious Agents

Because FEIBA is made from human plasma it may carry a risk of transmitting infectious agents, e.g., viruses, and the variant Creutzfeldt-Jakob disease (vCJD) agent, and theoretically, the Creutzfeldt-Jakob disease (CJD) agent. The risk has been minimized by screening plasma donors for prior exposure to certain viruses, by testing for the presence of certain current virus infections and by inactivating and removing certain viruses during the manufacturing process [see Description (11)]. Despite these measures, the product may still potentially transmit human pathogenic agents. There is also the possibility that unknown infectious agents may still be present.

All infections thought by a physician to have been possibly transmitted by this product should be reported by the physician or other healthcare providers to Takeda Pharmaceuticals U.S.A., Inc. at 1-877-TAKEDA-7 (1-877-825-3327) (in the U.S.) and /or to FDA Med Watch (1-800-FDA-1088 or www.fda.gov/medwatch).

5.4 Presence of Isohemagglutinins and Interference with Laboratory Tests

FEIBA contains blood group isohemagglutinins (anti-A and anti-B). Passive transmission of antibodies to erythrocyte antigens, e.g., A, B, D, may interfere with some serological tests for red cell antibodies, such as antiglobulin test (Coombs test).

6.1 Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice.

The safety assessment of FEIBA is based on the review of the data from two prospective clinical trials in which FEIBA was used for the treatment of acute bleeding episodes and a prospective trial that compared the use of FEIBA prophylactically versus on-demand treatment.

The adverse reactions reported from two prospective clinical trials in which FEIBA was used for the treatment of acute bleeding episodes were chills, chest pain, chest discomfort, dizziness, dysgeusia, dyspnea, hypoesthesia, increase of inhibitor titer (anamnestic response), nausea, pyrexia, and somnolence. Specifically, the first trial was a multicenter randomized, double-blind trial in 15 hemophilia A subjects with inhibitors to factors VIII. The second trial was a multicenter FEIBA study conducted in 44 hemophilia A subjects with inhibitors, 3 hemophilia B subjects with inhibitors and 2 acquired factor VIII inhibitor subjects. Of the 489 infusions used to treat acute bleeds during the second trial, 18 (3.7%) caused minor transient reactions of chills, fever, nausea, dizziness and dysgeusia. Out of 49 subjects, 10 (20%) had a rise in their inhibitor titers after treatment with FEIBA. Five of these subjects (50%) had increases that were tenfold or more, and 3 (30%) of these subjects received factor VIII or IX concentrates within 2 weeks prior to treatment with FEIBA. These anamnestic rises were not associated with decreased efficacy of FEIBA.

Table 2 lists the adverse reactions in >5% of subjects reported in the randomized, prospective prophylaxis trial comparing FEIBA prophylaxis with on-demand treatment in 36 hemophilia A and B subjects with inhibitors to factors VIII or IX3. The trial population included 33 (92%) subjects with hemophilia A and 3 (8.3%) subjects with hemophilia B. Four (11%) subjects were ≥7 to <12 years of age, 5 (14%) were ≥12 to <16 years of age, and 27 (75%) were ≥16 years of age. A total of 29 (80.6%) subjects were Caucasian, 3 (8.3%) Asian, 2 (5.6%) Black/African American, and 2 (5.6%) other. The subjects received a total of 4,513 infusions (3,131 for prophylaxis and 1,382 for on-demand).

Table 3 lists the adverse reactions and infusion related adverse events reported in >5% of subjects in any of the three groups (50% Reduced Volume, Increased Rate 4 U/kg/min; 50% Reduced Volume, Increased Rate 10 U/kg/min; Overall 50% Reduced Volume) of the randomized, prospective crossover trial evaluating the tolerability and safety of infusing reduced volume of FEIBA at the standard infusion rate of 2 U/kg/min, and at increased rates of 4 and 10 U/kg/min in a total of 33 treated subjects with congenital Hemophilia A with inhibitors.

6.2 Postmarketing Experience

The following adverse reactions have been identified during post-approval use of FEIBA. Because postmarketing reporting of adverse reactions is voluntary and from a population of uncertain size, it is not always possible to reliably estimate the frequency of these reactions or establish a causal relationship to product exposure.

Blood and Lymphatic System Disorders: disseminated intravascular coagulation

Cardiac Disorders: tachycardia, flushing

Respiratory, Thoracic, and Mediastinal Disorders: bronchospasm, wheezing

Gastrointestinal Disorders: abdominal discomfort

Skin and Subcutaneous Tissue Disorders: pruritus

General Disorders and Administration Site Conditions: malaise, feeling hot, injection site pain

Investigations: Fibrin D-dimer increased

7.1 Concomitant Medications

Consider the possibility of thrombotic events when systemic antifibrinolytics such as tranexamic acid and aminocaproic acid are used during treatment with FEIBA. No adequate and well-controlled studies of the combined or sequential use of FEIBA and recombinant factor VIIa antifibrinolytics, or emicizumab have been conducted. Use of antifibrinolytics within approximately 6 to 12 hours after the administration of FEIBA is not recommended.

Clinical experience from an emicizumab clinical trial suggests that a potential drug interaction may exist with emicizumab when FEIBA was used as part of a treatment regimen for breakthrough bleeding6 [see Warnings and Precautions (5.1)].

8.1 Pregnancy

8.2 Lactation

8.4 Pediatric Use

Safety and efficacy of FEIBA have been evaluated in nine pediatric subjects treated in the routine prophylaxis trial including 4 subjects ≥7 to <12 years of age and 5 subjects ≥12 to <16 years of age. The dosing for all pediatric subjects was based on body weight. A total of 576 infusions were given for the treatment of 223 bleeding episodes (504 infusions for joint bleeding episodes, 72 infusions for muscle and soft tissue bleeding episodes). In 223 (100%) of the episodes, hemostasis was achieved with one or more infusions. Hemostatic efficacy was rated as excellent or good in a majority (96.9%) of the bleeding episodes in both regimens at 24 hours post infusion. The median annualized bleeding episode rate (ABR) for children ≥7 to <12 years of age was 7.7 bleeds per patient per year, as compared to 39 for subjects treated with on-demand therapy [see Clinical Studies (14)].

The safety and efficacy of FEIBA has not been evaluated in neonates.

8.5 Geriatric Use

The safety and efficacy of FEIBA has not been evaluated in subjects ≥65 years of age.

12.1 Mechanism of Action

The mechanism of action of FEIBA is still the subject of scientific discussion. FEIBA contains multiple components, mainly non-activated factors II, IX, X and mainly activated factor VII. These factors can interact with plasma coagulation factors and platelets to increase the impaired thrombin generation of hemophilia patients with inhibitors, leading to hemostasis.

12.2 Pharmacodynamics

Laboratory assessment of coagulation does not necessarily correlate with or predict the hemostatic effectiveness of FEIBA. Factor VIII inhibitor bypassing activity of FEIBA has been demonstrated in vitro as well as in vivo. FEIBA can shorten the activated partial thromboplastin time (aPTT) and increase the thrombin generation in plasma containing factor VIII inhibitor.4,5

12.3 Pharmacokinetics

FEIBA is composed of different coagulation factors, with varying half-lives for the individual components. The pharmacokinetic properties of FEIBA have not been formally studied in humans.

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

Long-term animal studies to evaluate the carcinogenic potential of FEIBA or studies to determine the genotoxicity or the effect of FEIBA on fertility have not been performed. An assessment of the carcinogenic potential of FEIBA was completed to demonstrate minimal carcinogenic risk from product use.

How Supplied

FEIBA is available in single-dose vials in the following nominal dosage strengths:

The number of units of factor VIII inhibitor bypassing activity is stated on the label of each vial.

FEIBA is packaged with a suitable volume (10 mL, 20 mL, or 50 mL) of Sterile Water for Injection, U.S.P., one BAXJECT II Hi-Flow Needleless Transfer Device, and one Package Insert.

Not made with natural rubber latex.

Storage and Handling

• Store at 36°F to 77°F (2°C to 25°C)
• Store in the original package in order to protect from light.
• Do not freeze.
• Prior to preparation and reconstitution, allow the vials of FEIBA and Sterile Water for Injection (diluent) to reach room temperature, if refrigerated.