Overview
11 DESCRIPTION Agalsidase beta is a recombinant human α-galactosidase A enzyme with the same amino acid sequence as the native enzyme. Purified agalsidase beta is a homodimeric glycoprotein with a molecular weight of approximately 100 kD. The mature protein is comprised of two subunits of 398 amino acids (approximately 51 kD), each of which contains three N-linked glycosylation sites.
Mechanism of Action
12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action FABRAZYME (agalsidase beta) provides an exogenous source of α-galactosidase A in Fabry disease patients. Agalsidase beta is internalized and transported into lysosomes where it exerts enzymatic activity and reduces accumulated GL-3. 12.2 Pharmacodynamics In Study 1, baseline mean values for plasma GL-3 were similar in the FABRAZYME (14.4 µg/mL) and the placebo (14.7 µg/mL) treatment groups. In the FABRAZYME treatment group, all 29 patients experienced normalization of plasma GL-3 levels (≤7.03 µg/mL) and they maintained normal plasma GL-3 levels for up to 60 months of treatment.
Indications
- 1 INDICATIONS AND USAGE FABRAZYME ® is indicated for the treatment of adult and pediatric patients 2 years of age and older with confirmed Fabry disease. FABRAZYME is a hydrolytic lysosomal neutral glycosphingolipid-specific enzyme indicated for the treatment of adult and pediatric patients 2 years of age and older with confirmed Fabry disease. ( 1 )
Common Doses
- 1 mg
- 0.25 mg
- 15 mg
- 0.5 mg
Dosage
2 DOSAGE AND ADMINISTRATION Administration of FABRAZYME should be supervised by a healthcare provider knowledgeable in the management of hypersensitivity reactions including anaphylaxis. ( 2.1 ) The recommended dosage is 1 mg/kg body weight given every two weeks as an intravenous infusion. ( 2.2 ) See the full prescribing information for rechallenge, preparation, storage, and administration instructions. ( 2.3 , 2.4 , 2.5 , 2.6 ) 2.
Black Box Warning
WARNING: HYPERSENSITIVITY REACTIONS INCLUDING ANAPHYLAXIS Patients treated with enzyme replacement therapies have experienced life-threatening hypersensitivity reactions, including anaphylaxis. Anaphylaxis has occurred during the early course of enzyme replacement therapy and after extended duration of therapy. Initiate FABRAZYME in a healthcare setting with appropriate medical monitoring and support measures, including access to cardiopulmonary resuscitation equipment. If a severe hypersensitivity reaction (e.g.
Contraindications
- 4 CONTRAINDICATIONS None. None. ( 4 )
Side Effects
- 6 ADVERSE REACTIONS The following clinically significant adverse reactions are described elsewhere in labeling: Hypersensitivity Reactions Including Anaphylaxis [see Warnings and Precautions (5.1) ] Infusion-Associated Reactions [see Warnings and Precautions (5.2) ] Most common adverse reactions (≥20%) are: upper respiratory tract infection, chills, pyrexia, headache, cough, paresthesia, fatigue, peripheral edema, dizziness, and rash. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Genzyme at 1-800-633-1610 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.
Interactions
- No major interactions listed on the FDA label. Always consult a healthcare professional.