Vosoritide
High EvidenceA once-daily subcutaneous peptide (a 39-amino-acid analog of C-type natriuretic peptide, CNP) that is the first approved medicine to increase linear growth in children with achondroplasia. Marketed by BioMarin as Voxzogo, it works one step downstream of the overactive FGFR3 receptor that causes achondroplasia: by binding natriuretic peptide receptor-B (NPR-B), it dampens FGFR3's braking signal on the growth plate and lets cartilage cells proliferate and mature normally. First FDA-approved in November 2021 for children 5 and older with open growth plates, its label was expanded in 2023 to cover children under 5 (all ages with open growth plates). In 2026 BioMarin reported new long-term and early-treatment data and advanced a once-weekly successor CNP peptide, BMN 333.
What It Is
Vosoritide (development code BMN 111; BioMarin Pharmaceutical) is a recombinant, chemically stabilized 39-amino-acid analog of human C-type natriuretic peptide (CNP). It is the first drug approved to treat the underlying growth failure of achondroplasia, the most common form of disproportionate short stature (skeletal dysplasia), which affects roughly 1 in 25,000 births. Achondroplasia is caused by a gain-of-function mutation in FGFR3 (fibroblast growth factor receptor 3); the mutant receptor is chronically overactive and puts a constant brake on the cartilage growth plates at the ends of long bones, so endochondral bone growth is stunted. CNP is the body's natural counter-signal: acting through its receptor NPR-B, it inhibits the MAPK (RAS/RAF/MEK/ERK) arm of FGFR3 signaling and promotes chondrocyte proliferation and differentiation. Native CNP is destroyed within seconds by the enzyme neutral endopeptidase (NEP/neprilysin), which makes it useless as a drug; vosoritide is engineered to resist that breakdown while retaining NPR-B binding, giving it a plasma half-life long enough for once-daily dosing. It is given as a daily subcutaneous injection, weight-based (about 15 micrograms per kilogram). In the pivotal placebo-controlled Phase 3 trial, vosoritide increased annualized growth velocity by about 1.57 cm/year versus placebo over 52 weeks, and long-term extension data have shown the effect is durable over multiple years. The FDA granted accelerated approval on November 19, 2021 for children 5 years and older with achondroplasia and open (unfused) growth plates, based on the improvement in growth velocity; in 2023 the approval was expanded to children under 5, so it now covers all ages with open growth plates, and international consensus guidelines recommend starting treatment as early as possible. Vosoritide is a physician-prescribed, manufactured biologic-class peptide - not a self-sourced 'research chemical.' In 2026, BioMarin presented new multi-year data (arm span, body proportionality, bone health) at the ACMG, Pediatric Endocrine Society and ENDO meetings, reported three-year results in the related condition hypochondroplasia to support a planned FDA submission, and shared early data on BMN 333, a long-acting CNP peptide designed for once-weekly dosing.
Regulatory Status
Vosoritide (Voxzogo) received FDA accelerated approval on November 19, 2021 to increase linear growth in children aged 5 and older with achondroplasia and open epiphyses (growth plates). In 2023 the FDA expanded the indication to children under 5, so it now covers all pediatric patients with open growth plates. It is also approved in the EU and many other regions. It is a physician-prescribed injectable peptide, not a self-sourced research compound; any vendor selling 'vosoritide' or 'BMN 111' powder for self-use is illegitimate.
Effective: July 2026
View FDA SourceWhy Researchers Study It
Vosoritide is the proof-of-concept that a rare skeletal disorder can be treated by pharmacologically restoring a peptide signal that the disease-causing mutation has drowned out. Rather than trying to block the mutant FGFR3 receptor directly, it supplies extra CNP tone through a parallel receptor (NPR-B) to counterbalance the overactive brake on the growth plate - an elegant example of 'signal-balancing' therapy. For peptide scientists it is a case study in drug-hunting engineering: native CNP is degraded in seconds by neprilysin, so the challenge was to stabilize a fragile 39-residue hormone enough for once-daily injection while preserving receptor binding and avoiding the blood-pressure effects of the broader natriuretic-peptide system. Its success has opened an entire pipeline of CNP-pathway agents - including long-acting analogs (BMN 333) and prodrug approaches (TransCon CNP / navepegritide) aimed at weekly dosing - and has spurred exploration of the same biology in related conditions such as hypochondroplasia and other FGFR3-driven or growth-plate disorders.
Proposed Mechanisms
- Recombinant 39-amino-acid analog of human C-type natriuretic peptide (CNP), engineered to resist degradation by neutral endopeptidase (NEP/neprilysin) for a once-daily dosing half-life
- Binds natriuretic peptide receptor-B (NPR-B) on growth-plate chondrocytes, raising intracellular cGMP
- Inhibits the MAPK (RAS/RAF/MEK/ERK1/2) arm of FGFR3 signaling - the pathway made overactive by the achondroplasia mutation
- Relieves the excessive 'brake' on the growth plate, restoring chondrocyte proliferation, differentiation and endochondral ossification
- Increases annualized linear growth velocity and, over years, cumulative height and improved body proportionality
- Acts one step downstream of the mutant FGFR3 receptor rather than blocking it directly, a signal-balancing rather than receptor-blocking strategy
Evidence Snapshot
| Study Type | Model | Outcome | Link |
|---|---|---|---|
| RCT (human, Phase 3 - pivotal) | Achondroplasia - 121 children aged 5-14, daily subcutaneous vosoritide 15 mcg/kg vs placebo over 52 weeks | Annualized growth velocity improved by ~1.57 cm/year in favor of vosoritide (1.40 cm/yr vs -0.17 cm/yr for placebo); basis for the 2021 accelerated approval | Source |
| Long-term extension / real-world evidence | Achondroplasia - multi-year open-label extensions and registry/real-world cohorts (children of various ages, including under 5) | Sustained increase in growth velocity over multiple years with improvements in body proportionality and arm span; effect durable and generally consistent with the controlled trial | Source |
| Regulatory milestone | Achondroplasia (BioMarin) | FDA accelerated approval November 19, 2021 for children 5+ with open growth plates; indication expanded in 2023 to children under 5, covering all ages with open growth plates | Source |
| Pipeline / mechanism extension (2026) | Hypochondroplasia (3-year data) and BMN 333, a long-acting CNP peptide for achondroplasia (early data, ENDO 2026) | Three-year hypochondroplasia data support a planned FDA submission; BMN 333 showed sustained systemic exposure and prolonged target engagement supporting a once-weekly dosing schedule | Source |
Commonly Discussed Benefits
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Safety & Cautions
- Approved only for children with achondroplasia who still have OPEN growth plates; it has no growth benefit once the plates have fused and is not a general-purpose 'height' or performance drug
- A physician-prescribed injectable biologic given under specialist (pediatric endocrinology/genetics) supervision - not a self-administered 'research peptide.' Any vendor selling 'vosoritide' or 'BMN 111' powder is illegitimate and unsafe
- The most clinically watched risk relates to its natriuretic-peptide origin: transient decreases in blood pressure. Trials used strategies (adequate food/fluid intake before dosing) to mitigate symptomatic hypotension, and low blood pressure is a labeled warning
- Common adverse events include injection-site reactions and, less often, symptoms of low blood pressure (dizziness, fatigue, nausea); ongoing monitoring of growth, blood pressure and bone health is required
- Approved under the FDA's accelerated pathway based on growth velocity; long-term outcomes such as effects on final adult height, spinal/foramen magnum complications and function are still being characterized in extension studies
- Not medical advice. Dosing, eligibility and monitoring are individualized decisions made by a qualified clinician
Comparisons
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Citations
- [1] Voxzogo (vosoritide) FDA Approval History - Drugs.com PubMed
- [2] Vosoritide (Voxzogo) for Achondroplasia: A Review of Clinical and Real-World Evidence - PMC PubMed
- [3] Vosoritide approved for treatment of linear growth in pediatric patients with achondroplasia - ACMG therapeutics bulletin (PMC) PubMed
- [4] BioMarin Announces New Three-Year VOXZOGO (vosoritide) Data in Hypochondroplasia and BMN 333 Early Results at ENDO 2026 - BioSpace PubMed
- [5] VOXZOGO (vosoritide) for injection - FDA prescribing information (label) PubMed
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