TheraRadar

Pharma Intelligence, Simplified

Data updated: Mar 10, 2026

STRENSIQ

ASFOTASE ALFA
Approved 2015-10-23

STRENSIQ (asfotase alfa) is a tissue-nonspecific alkaline phosphatase indicated for the treatment of patients with hypophosphatasia (HPP). The therapy is specifically approved for use in patients with perinatal/infantile- and juvenile-onset forms of the disease. It serves as an enzyme replacement therapy to address the underlying metabolic deficiencies that lead to impaired bone mineralization.

Source: FDA Label • ALEXION PHARM • Tissue-nonspecific Alkaline Phosphatase

How STRENSIQ Works

Hypophosphatasia is caused by a deficiency in TNSALP enzyme activity, which leads to the accumulation of inorganic pyrophosphate (PPi), a substance that blocks bone mineralization. STRENSIQ replaces the missing TNSALP enzyme, which catalyzes the hydrolysis of phosphomonoesters into inorganic phosphate and alcohol. By reducing elevated extracellular levels of PPi, the treatment promotes hydroxyapatite crystal growth and prevents the accumulation of unmineralized bone matrix.

Source: FDA Label
2
Indications
--
Phase 3 Trials
1
Priority Reviews
10
Years on Market

Details

Status
Prescription
First Approved
2015-10-23
Routes
INJECTION
Dosage Forms
SOLUTION

Companies

Active Ingredient: ASFOTASE ALFA

STRENSIQ Approval History

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What STRENSIQ Treats

1 indications

STRENSIQ is approved for 1 conditions since its original approval in 2015. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Hypophosphatasia
Source: FDA Label

STRENSIQ Boxed 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 STRENSIQ under the supervision of a healthcare provider with appropriate medical monitoring and support measures. If a severe hypersensitivity reaction (e.g., anaphylaxis) occurs, discont...

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Key Completed Trials

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Completed studies with published results, ranked by significance

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Trial Timeline

Full development history with FDA approval milestones

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Understanding FDA Approval Types
Count Type What it means
- ORIG Original approval - drug first enters market
- SUPPL - Efficacy New indication (new disease/condition approved)
- SUPPL - Labeling Label text changes (warnings, dosing updates)
- SUPPL - Manufacturing Production changes (new facility)
- SUPPL - Chemistry Formulation changes (new dosage strength)

Green lines in the timeline show ORIG and Efficacy approvals - the clinically meaningful milestones.

STRENSIQ FDA Label Details

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Indications & Usage

FDA Label (PDF)

STRENSIQ ® is indicated for the treatment of patients with perinatal/infantile- and juvenile-onset hypophosphatasia (HPP). STRENSIQ is a tissue nonspecific alkaline phosphatase indicated for the treatment of patients with perinatal/infantile- and juvenile-onset hypophosphatasia (HPP).

⚠️ BOXED 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...

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Data Sources

Data sourced from official FDA and NIH databases. Click links to verify on original sources.