MYOZYME (alglucosidase alfa), a lysosomal glycogen-specific
enzyme, consists of the human enzyme acid α-glucosidase (GAA), encoded by
the most predominant of nine observed haplotypes of this gene. MYOZYME is
produced by recombinant DNA technology in a Chinese hamster ovary cell line.
The MYOZYME manufacturing process differs from that for LUMIZYME® ,
resulting in differences in some product attributes. Alglucosidase alfa
degrades glycogen by catalyzing the hydrolysis of α-1,4- and α-1,6-
glycosidic linkages of lysosomal glycogen.
Alglucosidase alfa is a glycoprotein with a calculated mass
of 99,377 daltons for the polypeptide chain, and a total mass of approximately
110 kilo Daltons, including carbohydrates. Alglucosidase alfa has a specific
activity of 3 to 5 U/mg (one unit is defined as that amount of activity that
results in the hydrolysis of 1 μmole of synthetic substrate per minute
under the specified assay conditions). MYOZYME is intended for intravenous
infusion. It is supplied as a sterile, nonpyrogenic, white to off-white,
lyophilized cake or powder for reconstitution with 10.3 mL Sterile Water for
Injection, USP. Each 50 mg vial contains 52.5 mg alglucosidase alfa, 210 mg
mannitol, 0.5 mg polysorbate 80, 9.9 mg sodium phosphate dibasic heptahydrate,
31.2 mg sodium phosphate monobasic monohydrate. Following reconstitution as
directed, each vial contains 10.5 mL reconstituted solution and a total
extractable volume of 10 mL at 5.0 mg/mL alglucosidase alfa. MYOZYME does not
contain preservatives; each vial is for single use only.
What are the possible side effects of alglucosidase alfa (Lumizyme, Myozyme)?
Some people receiving an injection of alglucosidase alfa have had a reaction to the infusion. This type of reaction can occur when the medicine is injected into the vein, or as long as 3 hours after the injection. Tell your caregivers or get emergency medical help right away if you have any of these signs of a severe allergic reaction:
- feeling like you might pass out, even while lying down;
- feeling restless, nervous, dizzy, or nauseated;
- pale skin, redness under your skin, sweating, feeling hot or cold;
- fast or slow heart...
Read All Potential Side Effects and See Pictures of Myozyme »
Last reviewed on RxList: 7/27/2012
This monograph has been modified to include the generic and brand name in many instances.