TheraRadar
Data updated: May 26, 2026

NULIBRY (fosdenopterin hydrobromide)

First-in-Class Orphan Drug Breakthrough Therapy Priority Review
Rare Disease Approved 2021-02-26

NULIBRY (fosdenopterin) is indicated to reduce the risk of mortality in patients with molybdenum cofactor deficiency (MoCD) Type A. This condition is caused by mutations in the *MOCS1* gene, resulting in a deficiency of cyclic pyranopterin monophosphate (cPMP). As a substrate replacement therapy, NULIBRY provides an exogenous source of cPMP to restore the biosynthetic pathway required for the activation of molybdenum-dependent enzymes.

Source: FDA Label • SENTYNL THERAPS INC

How NULIBRY Works

NULIBRY works as a substrate replacement therapy for cyclic pyranopterin monophosphate (cPMP). In patients with MoCD Type A, the endogenous synthesis of cPMP is impaired. Once administered, NULIBRY is converted into molybdopterin, which is subsequently converted into molybdenum cofactor. This cofactor is essential for the activation of molybdenum-dependent enzymes, most notably sulfite oxidase (SOX). Activation of SOX allows for the metabolism of neurotoxic sulfites into sulfates, thereby preventing progressive neurological damage and reducing mortality.

2
Indications
--
Phase 3 Trials
1
Priority Reviews
5
Years on Market

Details

Status
Prescription
First Approved
2021-02-26
Patent Cliff
2029

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Routes
INTRAVENOUS
Dosage Forms
POWDER

Companies

Active Ingredient: FOSDENOPTERIN HYDROBROMIDE

NULIBRY Approval History

2022
2023
2024
2025
2026
Original
New Indication
New Form
Label Update
2 FDA actions from 2021 to 2022 · 1 indication expansions
Oct 2022 SUPPL
Efficacy
Feb 2021 ORIGINAL Priority
New Drug · Type 1 - New Molecular Entity

What NULIBRY Treats

1 indications

NULIBRY is approved for 1 conditions since its original approval in 2021. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Molybdenum Cofactor Deficiency
Source: FDA Label
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Key Completed Trials

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Trial Timeline

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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.

NULIBRY FDA Label Details

Indications & Usage

FDA Label (PDF)

NULIBRY is indicated for the treatment of Molybdenum Cofactor Deficiency.

View full patent landscape →
1 OB patents · 1 families · 11 international docs across 7 countries

NULIBRY Patents & Exclusivity

Latest Patent: Apr 2029
Exclusivity: Feb 2028

Patents (1 active)

US7504095 Expires Apr 9, 2029

Exclusivity

NCE Until Feb 2026
ODE-342 Until Feb 2028
Source: FDA Orange Book

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Patent Timeline

  • Cliff: 2029
  • 1 active patents

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Data Sources

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