Myozyme 50 mg powder for concentrate for solution for infusion

One vial contains 50 mg of alglucosidase alfa.

After reconstitution, the solution contains 5 mg of alglucosidase* alfa per ml and after dilution, the concentration varies from 0.5 mg to 4 mg/ml.

*Human acid α-glucosidase is produced in Chinese hamster ovary cells (CHO) by recombinant DNA technology.

For a full list of excipients, see section 6.1.

Powder for concentrate for solution for infusion.

White to off-white powder.

Myozyme is indicated for long-term enzyme replacement therapy (ERT) in patients with a confirmed diagnosis of Pompe disease (acid α-glucosidase deficiency).

Myozyme is indicated in adults and paediatric patients of all ages.

In patients with late-onset Pompe disease the evidence of efficacy is limited (see section 5.1).

Myozyme treatment should be supervised by a physician experienced in the management of patients with Pompe disease or other inherited metabolic or neuromuscular diseases.

Posology

The recommended dose regimen of alglucosidase alfa is 20 mg/kg of body weight administered once every 2 weeks.

Patient response to treatment should be routinely eva luated based on a comprehensive eva luation of all clinical manifestations of the disease.

Paediatric and elderly population

There is no evidence for special considerations when Myozyme is administered to paediatric patients of all ages or elderly patients.

Renal and hepatic impairment

The safety and efficacy of Myozyme in patients with renal or hepatic impairment have not been eva luated and no specific dose regimen can be recommended for these patients.

Method of administration

Myozyme should be administered as an intravenous infusion.

Infusions should be administered incrementally. It is recommended that the infusion begin at an initial rate of 1 mg/kg/h and be gradually increased by 2 mg/kg/h every 30 minutes if there are no signs of infusion associated reactions (IARs) until a maximum rate of 7 mg/kg/h is reached. IARs are described in section 4.8.

For instructions on reconstitution and dilution of the medicinal product before administration, see section 6.6.

Life threatening hypersensitivity (anaphylactic reaction) to the active substance or to any of the excipients, when rechallenge was unsuccessful (see sections 4.4 and 4.8).

Hypersensitivity/Anaphylactic reactions

Serious and life-threatening anaphylactic reactions, including anaphylactic shock, have been reported in infantile- and late-onset patients during Myozyme infusions (see section 4.8). Because of the potential for severe infusion associated reactions, appropriate medical support measures, including cardiopulmonary resuscitation equipment, should be readily available when Myozyme is administered. If severe hypersensitivity or anaphylactic reactions occur, immediate discontinuation of Myozyme infusion should be considered and appropriate medical treatment should be initiated. The current medical standards for emergency treatment of anaphylactic reactions are to be observed.

Infusion Associated Reactions

Approximately half of the patients treated with Myozyme in infantile-onset clinical studies and 28% of the patients treated with Myozyme in a late-onset clinical study developed infusion associated reactions (IARs). IARs are defined as any related adverse event occurring during the infusion or during the hours following infusion. Some reactions were severe (see section 4.8). A tendency was observed in infantile patients treated with a higher dose (40 mg/kg) to experience more symptoms when developing IARs. Infantile onset patients who develop high antibody titres appear to be at higher risk for developing more frequent IARs. Patients with an acute illness (e.g. pneumonia, sepsis) at the time of Myozyme infusion appear to be at greater risk for IARs. Careful consideration should be given to the patient's clinical status prior to administration of Myozyme. Patients should be closely monitored and all cases of IARs, delayed reactions and possible immunological reactions should be reported to the marketing authorisation holder.

Patients who have experienced IARs (and in particular anaphylactic reactions) should be