Strensiq (Asfotase alfa)

Strensiq (Asfotase alfa)

Strensiq

Asfotase alfa

Injection: 80 mg/0.8 mL, 40 mg/mL, 28 mg/0.7 mL, or 18 mg/0.45 mL solution in single-use vials

Alexion Pharmaceuticals, Inc.

Medical Use

Strensiq is a tissue non-specific alkaline phosphatase and the sole prescription medication for treating patients with perinatal/infantile- and juvenile-onset hypophosphatasia (HPP).

Recommended Dosage:

-For Perinatal/Infantile-Onset HPP : The advised dosage of Strensiq injection is 6 mg/kg per week, administered subcutaneously. This can be given as either 2 mg/kg three times a week or 1 mg/kg six times a week. Note that injection site reactions might limit the tolerability of the six-times-per-week regimen.

If the initial dosage is ineffective, it can be increased to 9 mg/kg per week, administered as 3 mg/kg three times a week.

-For Juvenile-Onset HPP : The recommended dosage is 6 mg/kg per week, administered subcutaneously. This can be given as either 2 mg/kg three times a week or 1 mg/kg six times a week. Similar to the perinatal/infantile-onset dosage, injection site reactions may limit the tolerability of the six-times-per-week regimen.

Caution : 

Avoid using the Strensiq 80 mg/0.8 mL vial in pediatric patients weighing less than 40 kg. The systemic exposure of asfotase alfa with this higher concentration vial is lower than that achieved with other available strengths of Strensiq injection. This reduced exposure may not be suitable for this subgroup of patients.