Fabrazyme

FABRAZYME- agalsidase beta injection, powder, lyophilized, for solution
Genzyme Corporation

1 INDICATIONS AND USAGE

Fabrazyme® is indicated for use in patients with Fabry disease. Fabrazyme reduces globotriaosylceramide (GL-3) deposition in capillary endothelium of the kidney and certain other cell types.

2 DOSAGE AND ADMINISTRATION

2.1 Recommended Dosage

  • The recommended dosage of Fabrazyme is 1 mg/kg body weight infused every two weeks as an intravenous infusion. The initial intravenous infusion rate is no more than 0.25 mg/min (15 mg/hour). Slow the infusion rate in the event of infusion-associated reactions [see Warnings and Precautions (5.2)].
  • Administer antipyretics prior to infusion of Fabrazyme [see Warnings and Precautions (5.2)].
  • After patient tolerance to the infusion is well established, increase the infusion rate in increments of 0.05 to 0.08 mg/min (increments of 3 to 5 mg/hour) with each subsequent infusion.
  • The maximum infusion rate for patients weighing less than 30 kg, is 0.25 mg/minute (15 mg/hour).
  • For patients weighing 30 kg or greater, the minimum infusion duration is 1.5 hours (based on individual patient tolerability).
  • Patients who have had a positive skin test to Fabrazyme or who have tested positive for anti-Fabrazyme IgE may be successfully rechallenged with Fabrazyme. The initial rechallenge administration should be a low dose at a lower infusion rate, e.g., 1/2 the therapeutic dose (0.5 mg/kg) at 1/25 the initial standard recommended rate (0.01 mg/min). Once a patient tolerates the infusion, the dose may be increased to reach the approved dose of 1 mg/kg and the infusion rate may be increased by slowly titrating upwards (doubled every 30 minutes up to a maximum rate of 0.25 mg/minute), as tolerated.

2.2 Preparation and Administration Instructions

Fabrazyme does not contain any preservatives. Vials are for single use only. Discard any unused product.

Avoid shaking or agitating this product. Do not use filter needles during the preparation of the infusion.

Reconstitution and Dilution (using Aseptic Technique)

  1. Allow Fabrazyme vials and diluent to reach room temperature prior to reconstitution (approximately 30 minutes). The number of 35 mg and 5 mg vials needed is based on the patient’s body weight (kg) and the recommended dose of 1 mg/kg.
    Select a combination of 35 mg and 5 mg vials so that the total number of mg is equal to or greater than the patient’s number of kg of body weight.
  2. Reconstitute each 35 mg vial of Fabrazyme by slowly injecting 7.2 mL of Sterile Water for Injection, USP down the inside wall of each vial. Roll and tilt each vial gently. Each vial will yield a 5 mg/mL clear, colorless solution (total extractable amount per vial is 35 mg, 7 mL).Reconstitute each 5 mg vial of Fabrazyme by slowly injecting 1.1 mL of Sterile Water for Injection, USP down the inside wall of each vial. Roll and tilt each vial gently. Each vial will yield a 5 mg/mL clear, colorless solution (total extractable amount per vial is 5 mg, 1 mL).
  3. Visually inspect the reconstituted vials for particulate matter and discoloration. Do not use the reconstituted solution if there is particulate matter or if it is discolored.
  4. The reconstituted solution should be further diluted with 0.9% Sodium Chloride Injection, USP to a total volume based on patient weight specified in Table 1 below. Prior to adding the volume of reconstituted Fabrazyme required for the patient dose, remove an equal volume of 0.9% Sodium Chloride Injection, USP from the infusion bag.
    Table 1
    Patient Weight (kg)Minimum Total Volume (mL)
    ≤3550
    35.1–70100
    70.1–100250
    >100500

    Example: Patient dose = 80 mg
    80 mg ÷ 5 mg/mL = 16 mL of FabrazymeSlowly withdraw the reconstituted solution from each vial up to the total volume required for the patient dose. Inject the reconstituted Fabrazyme solution directly into the Sodium Chloride solution. Do not inject in the airspace within the infusion bag. Discard any vial with unused reconstituted solution.
  5. Gently invert infusion bag to mix the solution, avoiding vigorous shaking and agitation.
  6. Do not infuse Fabrazyme in the same intravenous line with other products.
  7. Administer Fabrazyme using an in-line low protein binding 0.2 µm filter.

Storage

Use reconstituted and diluted solutions of Fabrazyme immediately. If immediate use is not possible, the reconstituted and diluted solution may be stored for up to 24 hours at 2°C to 8°C (36°F to 46°F).

3 DOSAGE FORMS AND STRENGTHS

For injection: 5 mg or 35 mg of agalsidase beta as a white to off-white, lyophilized cake or powder in a single-dose vial for reconstitution.

4 CONTRAINDICATIONS

None.

5 WARNINGS AND PRECAUTIONS

5.1 Anaphylaxis and Allergic Reactions

Life-threatening anaphylactic and severe allergic reactions have been observed in patients during Fabrazyme infusions. Reactions have included localized angioedema (including swelling of the face, mouth, and throat), bronchospasm, hypotension, generalized urticaria, dysphagia, rash, dyspnea, flushing, chest discomfort, pruritus, and nasal congestion. Interventions have included cardiopulmonary resuscitation, oxygen supplementation, intravenous fluids, hospitalization, and treatment with inhaled beta-adrenergic agonists, epinephrine, and intravenous corticosteroids.

In clinical trials and postmarketing safety experience with Fabrazyme, approximately 1% of patients developed anaphylactic or severe allergic reactions during Fabrazyme infusion.

If anaphylactic or severe allergic reactions occur, immediately discontinue the administration of Fabrazyme and initiate necessary emergency treatment. Because of the potential for severe allergic reactions, appropriate medical support measures should be readily available when Fabrazyme is administered.

The risks and benefits of readministering Fabrazyme following an anaphylactic or severe allergic reaction should be considered. Extreme care should be exercised, with appropriate medical support measures readily available, if the decision is made to readminister the product [see Warnings and Precautions (5.4) and Clinical Studies (14)].

5.2 Infusion-associated Reactions

In clinical trials with Fabrazyme, 59% of patients experienced infusion-associated reactions during Fabrazyme administration, some of which were severe [see Warnings and Precautions (5.1)]. Severe infusion-associated reactions experienced by more than one patient in clinical studies with Fabrazyme included chills, vomiting, hypotension, and paresthesia. Other infusion-associated reactions included pyrexia, feeling hot or cold, dyspnea, nausea, flushing, headache, fatigue, pruritus, pain in extremity, hypertension, chest pain, throat tightness, abdominal pain, dizziness, tachycardia, nasal congestion, diarrhea, edema peripheral, myalgia, urticaria, bradycardia, and somnolence.

Most patients in clinical trials were pretreated with acetaminophen. In patients experiencing infusion-associated reactions, pretreatment with an antipyretic and antihistamine is recommended. Infusion-associated reactions occurred in some patients after receiving pretreatment with antipyretics, antihistamines, and oral steroids. Infusion-associated reactions tended to decline in frequency with continued use of Fabrazyme. However, infusion-associated reactions may still occur despite extended duration of Fabrazyme treatment. If an infusion-associated reaction occurs, decreasing the infusion rate, temporarily stopping the infusion, and/or administrating additional antipyretics, antihistamines, and/or steroids may ameliorate the symptoms. If severe infusion-associated reactions occur, immediate discontinuation of the administration of Fabrazyme should be considered and appropriate medical treatment should be initiated. Severe reactions are generally managed with administration of antihistamines, corticosteroids, intravenous fluids, and/or oxygen, when clinically indicated. Because of the potential for severe infusion-associated reactions, appropriate medical support measures should be readily available when Fabrazyme is administered. Patients who have experienced infusion-associated reactions should be treated with caution when readministering Fabrazyme.

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