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Data updated: Jun 28, 2026

MEPSEVII (vestronidase alfa-vjbk) · ULTRAGENYX PHARM INC

Rare Disease Approved 2017-11-15

Mepsevii (vestronidase alfa-vjbk) is a recombinant human lysosomal beta glucuronidase indicated for the treatment of Mucopolysaccharidosis VII, also known as Sly syndrome. The therapy is approved for use in both pediatric and adult patients to address the underlying enzyme deficiency associated with the disorder. However, the effect of this treatment on the central nervous system manifestations of the disease has not been determined.

Source: FDA Label • Lysosomal beta Glucuronidase

How MEPSEVII Works

Mucopolysaccharidosis VII is caused by a deficiency of the enzyme beta glucuronidase (GUS), which results in the accumulation of glycosaminoglycans (GAGs) and subsequent multisystem tissue damage. Vestronidase alfa-vjbk provides an exogenous source of the GUS enzyme that is internalized into cellular lysosomes via mannose-6-phosphate receptors on the cell surface. Once inside the lysosomes, the enzyme facilitates the catabolism of accumulated GAGs in affected tissues.

2
Indications
--
Phase 3 Trials
1
Priority Reviews
8
Years on Market

Details

Status
Prescription
First Approved
2017-11-15
Patent Cliff
2024

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Routes
INJECTION
Dosage Forms
INJECTABLE

Companies

Active Ingredient: VESTRONIDASE ALFA-VJBK

MEPSEVII Approval History

2018
2019
2020
2021
2022
2023
2024
2025
2026
Original
New Indication
New Form
Label Update
3 FDA actions from 2017 to 2020 · 1 indication expansions
Dec 2020 SUPPL
Efficacy
Dec 2019 SUPPL
Label · Labeling
Nov 2017 ORIGINAL Priority
New Drug · Type 1 - New Molecular Entity

What MEPSEVII Treats

1 indications

MEPSEVII is approved for 1 conditions since its original approval in 2017. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Mucopolysaccharidosis VII
Source: FDA Label

MEPSEVII Boxed Warning

ANAPHYLAXIS Anaphylaxis has occurred with MEPSEVII administration, as early as the first dose [see Warnings and Precautions ( 5.1 )] , therefore appropriate medical support should be readily available when MEPSEVII is administered. Closely observe patients during and for 60 minutes after MEPSEVII infusion [see Dosage and Administration ( 2.2 ), Warnings and Precautions ( 5.1 )]. Immediately discontinue the MEPSEVII infusion if the patient experiences anaphylaxis [see Dosage and Administration ( ...

ULTRAGENYX PHARM INC's other novel FDA approvals

Other CDER-designated drugs from the same sponsor (2016–2025).

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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.

MEPSEVII FDA Label Details

Indications & Usage

FDA Label (PDF)

MEPSEVII is indicated in pediatric and adult patients for the treatment of Mucopolysaccharidosis VII (MPS VII, Sly syndrome). Limitations of Use The effect of MEPSEVII on the central nervous system manifestations of MPS VII has not been determined. MEPSEVII is a recombinant human lysosomal beta glucuronidase indicated in pediatric and adult patients for the treatment of Mucopolysaccharidosis VII (MPS VII, Sly syndrome). Limitations of Use The effect of MEPSEVII on the central nervous system manifestations of MPS VII has not been determined.

⚠️ BOXED WARNING

WARNING: ANAPHYLAXIS Anaphylaxis has occurred with MEPSEVII administration, as early as the first dose [see Warnings and Precautions ( 5.1 )] , therefore appropriate medical support should be readily available when MEPSEVII is administered. Closely observe patients during and for 60 minutes after ME...

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Data Sources

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