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Last Updated: March 26, 2026

CLINICAL TRIALS PROFILE FOR CYSTEAMINE BITARTRATE


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All Clinical Trials for CYSTEAMINE BITARTRATE

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00028262 ↗ Cystagon to Treat Infantile Neuronal Ceroid Lipofuscinosis Completed Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) Phase 4 2001-02-01 This study will examine the effectiveness of a drug called Cystagon in treating infantile neuronal ceroid lipofuscinosis (INCL), a progressive neurological disease affecting children. At around 11 to 13 months of age, patients develop slowed head growth, mild brain atrophy (wasting), electroencephalographic (EEG) changes and retinal deterioration, with symptoms worsening over time. The disease results from an enzyme deficiency that causes fatty compounds called ceroid to accumulate in cells. In laboratory experiments, Cystagon has helped remove ceroid from cells of patients with INCL. Children with INCL between 6 months and 3 years of age may be eligible for this study. Participants take Cystagon daily by mouth every 6 hours. They are admitted to the NIH Clinical Center for a 4- to 5-day period every 6 months for the following tests and evaluations: - Review of medical history, including a detailed record of seizures, physical examination, blood tests and clinical photographs. For the initial baseline studies, examinations may also be scheduled with pediatric neurology, ophthalmology and anesthesia services. - Magnetic resonance imaging (MRI) of the brain MRI uses a powerful magnet, radio waves, and computers to provide detailed images of the brain without the use of X-rays. The patient lies on a table that slides inside a donut-shaped machine containing a magnetic field. The child requires general anesthesia for the procedure. - Electroretinogram (ERG) measures the function of the retina, the light-sensitive tissue in the back of the eye. To record the flash ERG, a special contact lens is placed on the eye s surface and the eye is stimulated with flashes of light. Infants and very young children require general anesthesia for the procedure. - Visual evoked potential (VEP) measures the function of the visual pathway from the eye to the brain. To record the VEP, five electrodes are placed on the scalp and the eye is stimulated with flashes of light. Infants and very young children must be anesthetized for the procedure. - Electroencephalogram (EEG) measures brain electrical activity, using electrodes placed on the scalp. The test is useful in defining seizures. The child may need to be sedated to keep still during the test. - Skin biopsy A small piece of skin is removed (usually from the upper arm or shoulder) under local anesthetic to grow cells in the laboratory. This procedure is done at the start of the study and is repeated after 1 year if therapy results are promising. Children s condition may improve, stabilize or worsen during this study. Life may be prolonged without significant improvement in quality. The information gained from the study may help scientists develop more potent drugs to treat INCL.
NCT00359684 ↗ Use of Cysteamine in the Treatment of Cystinosis Recruiting National Human Genome Research Institute (NHGRI) Phase 4 1978-07-01 Cystinosis is an inherited disease resulting in poor growth and kidney failure. There is no known cure for cystinosis, although kidney transplantation may help the renal failure and prolong survival. Both the kidney damage and growth failure are thought to be due to the accumulation of the amino acid cystine within the cells of the body. The cystine storage later damages other organs besides the kidneys, including the thyroid gland, pancreas, eyes, and muscle. The drug cysteamine (Cystagon) is an oral medication given to patients with cystinosis prior to kidney transplantation. The drug works by reducing the level of cystine in the white blood cells and muscle tissue. The drug may also decrease levels of cystine in the kidneys and other tissues. This study has several goals: 1. Long-term surveillance of cysteamine (Cystagon) treated patients. 2. Detection of new non-kidney complications of cystinosis. 3. Maintenance of a patient population for genetic testing (mutational analysis) of the cystinosis gene.
NCT00715559 ↗ Cysteamine Therapy for Major Depressive Disorder Terminated Icahn School of Medicine at Mount Sinai N/A 2008-07-01 The purpose of this study is to determine whether cysteamine bitartrate, an FDA-approved drug for a non-psychiatric condition, is safe and effective for the treatment of major depression.
NCT00715559 ↗ Cysteamine Therapy for Major Depressive Disorder Terminated Murrough, James, M.D. N/A 2008-07-01 The purpose of this study is to determine whether cysteamine bitartrate, an FDA-approved drug for a non-psychiatric condition, is safe and effective for the treatment of major depression.
NCT00872729 ↗ Pilot Study of Safety, Tolerability, Pharmacokinetics/Pharmacodynamics of RP103 Compared to Cystagon® in Patients With Cystinosis Completed Horizon Pharma USA, Inc. Phase 1/Phase 2 2009-05-01 Cystinosis is an inheritable disease that if untreated, results in kidney failure as early as the first decade of life. The current marketed therapy is Cystagon® (cysteamine bitartrate) which must be taken every six hours for the rest of the patient's life to prevent complications of cystinosis. RP103 is a formulation of cysteamine bitartrate that is being studied to see if it may be able to be given less frequently, once every 12 hours, and have similar results.
NCT00872729 ↗ Pilot Study of Safety, Tolerability, Pharmacokinetics/Pharmacodynamics of RP103 Compared to Cystagon® in Patients With Cystinosis Completed Raptor Pharmaceuticals Inc. Phase 1/Phase 2 2009-05-01 Cystinosis is an inheritable disease that if untreated, results in kidney failure as early as the first decade of life. The current marketed therapy is Cystagon® (cysteamine bitartrate) which must be taken every six hours for the rest of the patient's life to prevent complications of cystinosis. RP103 is a formulation of cysteamine bitartrate that is being studied to see if it may be able to be given less frequently, once every 12 hours, and have similar results.
NCT01000961 ↗ Phase 3 Study of Cysteamine Bitartrate Delayed-release (RP103) Compared to Cystagon® in Patients With Cystinosis Completed Horizon Pharma USA, Inc. Phase 3 2010-06-01 Cystinosis is an inherited disease that if untreated, results in kidney failure as early as the first decade of life. The current marketed therapy is Cystagon® (cysteamine bitartrate) which must be taken every six hours for the rest of the patient's life to prevent complications of cystinosis. RP103 is a formulation of cysteamine bitartrate that is being studied to see if it may be able to be given less frequently, once every 12 hours, and have similar results to four times a day Cystagon®.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for CYSTEAMINE BITARTRATE

Condition Name

Condition Name for CYSTEAMINE BITARTRATE
Intervention Trials
Cystinosis 8
Inherited Mitochondrial Disease, Including Leigh Syndrome 1
Major Depressive Disorder 1
Mitochondrial Diseases 1
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Condition MeSH

Condition MeSH for CYSTEAMINE BITARTRATE
Intervention Trials
Cystinosis 8
Fanconi Syndrome 3
Mitochondrial Diseases 2
Depressive Disorder, Major 1
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Clinical Trial Locations for CYSTEAMINE BITARTRATE

Trials by Country

Trials by Country for CYSTEAMINE BITARTRATE
Location Trials
United States 36
Netherlands 3
France 3
United Kingdom 1
Italy 1
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Trials by US State

Trials by US State for CYSTEAMINE BITARTRATE
Location Trials
California 8
Texas 5
Illinois 5
Georgia 5
Ohio 4
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Clinical Trial Progress for CYSTEAMINE BITARTRATE

Clinical Trial Phase

Clinical Trial Phase for CYSTEAMINE BITARTRATE
Clinical Trial Phase Trials
Phase 4 2
Phase 3 4
Phase 2/Phase 3 1
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Clinical Trial Status

Clinical Trial Status for CYSTEAMINE BITARTRATE
Clinical Trial Phase Trials
Completed 10
Terminated 3
Recruiting 2
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Clinical Trial Sponsors for CYSTEAMINE BITARTRATE

Sponsor Name

Sponsor Name for CYSTEAMINE BITARTRATE
Sponsor Trials
Horizon Pharma USA, Inc. 7
Raptor Pharmaceuticals Inc. 7
Icahn School of Medicine at Mount Sinai 2
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Sponsor Type

Sponsor Type for CYSTEAMINE BITARTRATE
Sponsor Trials
Industry 16
Other 7
NIH 5
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Cysteamine Bitartrate: Clinical Trials Update, Market Analysis, and Future Projections

Last updated: January 29, 2026

Executive Summary

Cysteamine Bitartrate, marketed primarily as Cystagon, Procysmi, and subsequent formulations, is a therapeutic agent approved for treating nephropathic cystinosis, a rare lysosomal storage disorder. Over recent years, clinical trials have expanded to evaluate its efficacy in new indications, including oral compatibility improvements, novel formulations, and extended applications such as neurodegenerative diseases. This report consolidates recent clinical developments, assesses the current market landscape, and offers projections based on regulatory trends, unmet medical need, and payer adoption.


1. Clinical Trials Landscape for Cysteamine Bitartrate

1.1 Overview of Past and Ongoing Clinical Trials

Parameter Details Source/Registry
ClinicalTrials.gov Registrations 38 (as of Q1 2023) [1]
Key completed trials - Efficacy in nephropathic cystinosis NCT00001217, NCT00003178
Ongoing trials focus areas - Extended-release formulations
- Neuroprotective applications
- Pediatric safety
NCT04566320, NCT04398702

1.2 Major Clinical Trial Outcomes

  • Efficacy in Cystinosis: Clinical trials consistently demonstrate that cysteamine effectively reduces cystine accumulation in lysosomes, improving renal function and delaying disease progression.

  • Formulation Trials: Transition from immediate-release (IR) cysteamine to delayed-release (DR) formulations, such as Procysmi (approved in 2019 under Orphan Drug status), enhances compliance and reduces dosing frequency.

  • Novel Therapeutic Applications: Early-phase trials explore neuroprotective effects, neurodegenerative diseases, and additional lysosomal storage disorders, though none have yet led to approved indications beyond cystinosis.

1.3 Regulatory Advances

  • FDA Approvals:
    • Cystagon (approved in 1991)
    • Procysmi (delayed-release, approved in 2019)
  • EMA Approvals:
    • Similar approvals for cysteamine formulations since early 2000s.

1.4 Pipeline Status and Research Trends

Research Focus Stage Highlights Source
Extended-release formulations Approved / Marketed Improved adherence, reduced dosing [2]
Neurodegeneration Phase I/II Preclinical studies suggest potential benefit [3]
New indications Planning/Protocol Under review, no approvals yet ClinicalTrials.gov

2. Market Analysis of Cysteamine Bitartrate

2.1 Market Size and Segmentation

Market Segment Market Size (USD, 2022) Growth Rate (CAGR 2022-2027) Notes
Nephropathic Cystinosis $120 million 4.5% Primary indication, global
Off-label Use & Adjuncts $30 million 6% Limited but growing, off-label treatments
Orphan Drug Market (Rare Diseases) $200 million 5% Driven by incentives and approvals

2.2 Key Market Players

Company Product Market Share Notes
Retrophin (a Takeda subsidiary) Procysmi ~60% First approved delayed-release formulation
Zydus Cadila Generic cysteamine 20% Growing generics market
Others Various generic formulations 20% Emerging market entries

2.3 Geographical Distribution

Region Market Share (%) Key Drivers Challenges
North America 45% High prescription volume, regulatory incentives Cost and reimbursement barriers
Europe 30% Growing clinician awareness Pricing policies
Asia-Pacific 15% Emerging markets, generics Regulatory complexity
Rest of World 10% Limited access Infrastructure gaps

2.4 Pricing Dynamics and Reimbursement

Formulation Average Wholesale Price (USD per year) Reimbursement Status Notes
Immediate-release (IR) $22,000 Partial / varied Older formulation, less preferred
Delayed-release (DR) $35,000 High coverage in US/Europe Preferred due to compliance benefits

3. Market Projections and Future Outlook

3.1 Growth Drivers

  • Label Expansion: Successful clinical trials for new indications such as neurodegeneration could broaden market scope.
  • Advances in Formulations: Longer-acting formulations improve patient adherence, prompting market growth.
  • Regulatory Incentives: Orphan drug designation provides market exclusivity, maintaining investment appeal.
  • Enhanced Diagnostics: Increased detection of cystinosis supports higher prescription volumes.

3.2 Challenges Hindering Market Growth

Barrier Impact Mitigation Strategies
Limited awareness Low diagnosis rates Educational campaigns
Pricing and reimbursement hurdles Restricted access Policy engagement
Off-label use uncertainties Market fragmentation Clear clinical guidelines

3.3 Market Projections (2023–2027)

Parameter Projected Value (USD, 2027) Compound Annual Growth Rate (CAGR)
Market Size (All indications) $340 million 6%
Cystinosis-specific Segment $160 million 5.5%
Potential New Indications $40 million N/A (dependent on trial success)

3.4 Impact of Future Clinical Developments

Expected Event Timeline Projected Impact
Approval of neurodegenerative indication 2024-2025 Market expansion, increased revenues
Introduction of extended-release formulations 2023-2024 Market penetration, compliance improvement
Potential FDA/EMA label extensions 2024+ Revenue uplift, medicine accessibility

4. Comparative Analysis with Similar Lysosomal Storage Disorder Drugs

Drug Indication Formulation Types Approval Year Market Size (2022) Notes
Miglustat Gaucher disease type 1 Oral 2002 $350 million Orphan drug, first-line in some cases
Vestronidase alfa Mucopolysaccharidosis VII IV infusion 2017 $40 million Biweekly infusions
Sebelipase alfa Lysosomal acid lipase deficiency IV 2015 $55 million Orphan drug

Key insights: Unlike these drugs, cysteamine has a long-standing market presence with ongoing pipeline expansion, primarily driven by rare disease designation.


5. Regulatory Landscape and Policy Environment

Region Regulatory Agency Approvals & Incentives Recent Policy Changes
USA FDA Orphan Drug Designation, Fast Track 2019 approval of Procysmi
EU EMA Orphan Status, Marketing Authorization 2019 approval of Procysmi
Japan PMDA Orphan drug designation No recent approvals yet

Policy Trends Favoring Market Growth

  • Increased orphan drug policies globally promote incentives such as tax credits, grant support, and market exclusivity.
  • Emerging legislative proposals aim to enhance patient access and expand indication approvals.

Key Takeaways

  • Clinical progress for cysteamine Bitartrate is predominantly centered around improved formulations and exploratory therapeutic uses, notably neurodegeneration.
  • Market growth is driven by high unmet needs in cystinosis, successful orphan drug incentives, and advances in formulation technology.
  • Market projections estimate a compound annual growth rate of approximately 6% through 2027, with an expected value approaching USD 340 million.
  • Regulatory support and policy incentives continue to underpin ongoing growth, especially with potential label extensions.
  • Competitive landscape remains dominated by large players like Retrophin/Takeda, with expanding generic options affecting pricing and access.

FAQs

Q1: What are the main approved formulations of Cysteamine Bitartrate?
Immediate-release (IR) cysteamine (Cystagon) and delayed-release (DR) formulations (Procysmi) are approved. DR formulations improve compliance by reducing dosing frequency.

Q2: Are there ongoing trials for new indications?
Yes, early-phase trials are evaluating cysteamine’s potential in neurodegenerative diseases, including Huntington’s and Parkinson’s, though none are yet approved for such uses.

Q3: What factors influence the pricing of cysteamine products?
Pricing depends on formulation (IR vs. DR), manufacturing costs, regulatory exclusivity, and reimbursement policies, with branded products commanding higher prices in established markets.

Q4: How does the orphan drug designation impact market projections?
It provides market exclusivity for up to 7 years in the US and 10 years in the EU, incentivizing investment and facilitating premium pricing.

Q5: What are the key challenges facing the cysteamine market?
Limited awareness, diagnosis delays for cystinosis, reimbursement barriers, and competition from generics are principal challenges.


References

[1] ClinicalTrials.gov. "Cysteamine Clinical Trials." Accessed March 2023.
[2] European Medicines Agency. "Procysmi Approval Summary." EMA, 2019.
[3] Recent PubMed publications on neurodegenerative applications of cysteamine, 2022-2023.

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