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RX BIN: 015558
Group ID: DDN6600
Card Holder ID: DDN6600

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2018 Price of Asfotase Alfa


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Asfotase Alfa volume of distribution

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What is Asfotase Alfa

Asfotase Alfa is a first-in-class bone-targeted enzyme replacement therapy designed to address the underlying cause of hypophosphatasia (HPP) deficient alkaline phosphatase (ALP). Hypophosphatasia is almost always fatal when severe skeletal disease is obvious at birth. By replacing deficient ALP, treatment with Asfotase Alfa aims to improve the elevated enzyme substrate levels and improve the body’s ability to mineralize bone, thereby preventing serious skeletal and systemic patient morbidity and premature death. Asfotase alfa was first approved by Pharmaceuticals and Medicals Devices Agency of Japan (PMDA) on July 3, 2015, then approved by the European Medicine Agency (EMA) on August 28, 2015, and was approved by the U.S. Food and Drug Administration (FDA) on October 23, 2015. Asfotase Alfa is marketed under the brand name Strensiq by Alexion Pharmaceuticals, Inc. The annual average price of Asfotase Alfa treatment is $285,000.

Asfotase Alfa mechanism of action

HPP is caused by a deficiency in TNSALP (tissue non-specific alkaline phosphatase) enzyme activity, which leads to elevations in several TNSALP substrates, including inorganic pyrophosphate (PPi). Elevated extracellular levels of PPi block hydroxyapatite crystal growth which inhibits bone mineralization and causes an accumulation of unmineralized bone matrix which manifests as rickets and bone deformation in infants and children and as osteomalacia (softening of bones) once growth plates close, along with muscle weakness. Replacement of the TNSALP enzyme upon Asfotase alfa treatment reduces the enzyme substrate levels.

Dosage forms of Asfotase Alfa

Solutionsubcutaneous100 mg
Solutionsubcutaneous18 mg/.45mL
Solutionsubcutaneous28 mg/.7mL
Prescription Generics


International Brands



Asfotase alpha


Alexion Pharma Ghbh

CAS number






Affected organisms

Humans and other mammals

Indication of Asfotase Alfa

Indicated for the treatment of patients with perinatal/infantile and juvenile onset hypophosphatasia (HPP).

Toxicity of Asfotase Alfa

There are no available human data on Asfotase Alfa use in pregnant women to inform a drug associated risk. In animal reproduction studies, Asfotase Alfa administered intravenously to pregnant rats and rabbits during the period of organogenesis showed no evidence of fetotoxicity, embryolethality or teratogenicity at doses causing plasma exposures up to 21 and 24 times, respectively, the exposure at the recommended human dose.

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