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Last Updated: March 26, 2026

Estrone - Generic Drug Details


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What are the generic sources for estrone and what is the scope of patent protection?

Estrone is the generic ingredient in four branded drugs marketed by Wyeth Ayerst, Dr Reddys, Watson Labs, and Parkedale, and is included in five NDAs. Additional information is available in the individual branded drug profile pages.

There are nine drug master file entries for estrone.

Summary for estrone
Recent Clinical Trials for estrone

Identify potential brand extensions & 505(b)(2) entrants

SponsorPhase
Fudan UniversityPHASE2
University of Sao Paulo General HospitalPHASE3
Biòs FarmacêuticaN/A

See all estrone clinical trials

Medical Subject Heading (MeSH) Categories for estrone

US Patents and Regulatory Information for estrone

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Wyeth Ayerst ESTROGENIC SUBSTANCE estrone INJECTABLE;INJECTION 083488-001 Approved Prior to Jan 1, 1982 DISCN No No ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
Watson Labs NATURAL ESTROGENIC SUBSTANCE-ESTRONE estrone INJECTABLE;INJECTION 085237-001 Nov 23, 1982 DISCN No No ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
Parkedale THEELIN estrone INJECTABLE;INJECTION 003977-002 Approved Prior to Jan 1, 1982 DISCN No No ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
Parkedale THEELIN estrone INJECTABLE;INJECTION 003977-001 Approved Prior to Jan 1, 1982 DISCN No No ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Exclusivity Expiration

Market Dynamics and Financial Trajectory for ESTRONE (17-Estrone)

Last updated: January 22, 2026


Summary

Estrone (17-Estrone) is a naturally occurring estrogen hormone used historically for hormone replacement therapy (HRT) and as a research compound. Although its clinical and commercial prominence has diminished with the advent of more advanced estrogen formulations, understanding its market dynamics and financial trajectory remains relevant for pharmaceutical companies, investors, and regulatory bodies. This analysis evaluates current demand, manufacturing trends, regulatory landscape, competitive positioning, and potential future growth avenues for estrone.


Introduction

Table 1: Key Characteristics of Estrone (17-Estrone)

Attribute Details
Molecular Formula C18H22O2
Molecular Weight 270.37 g/mol
Pharmacological Class Estrogen hormone
Primary Uses Research, hormone replacement therapy (historical)
Market Status Declining in clinical application; niche research

Current Market Landscape

Demand Drivers

  • Research Applications: Estrone remains a staple in endocrinology research for studying estrogenic pathways.
  • Pharmaceutical Development: Limited; replaced by synthetic estrogens like ethinylestradiol and estradiol derivatives with improved pharmacokinetics.
  • Regulatory Status: Widely regarded as a legacy compound, with no recent approvals for new indications.

Supply Chain and Manufacturing

  • Manufacturers: Primarily compounding chemical suppliers and research chemical vendors (Sigma-Aldrich, Toronto Research Chemicals).
  • Production Trends: Declining manufacturing volumes, with some facilities ceasing estrone synthesis owing to decreased demand.
  • Pricing Dynamics: Reduced due to oversupply and niche market status.

Regulatory Environment

  • Approval Status: No recent approvals for new indications.
  • Quality Standards: Must meet pharmacopoeia specifications (USP, EP) for research-grade or pharmaceutical-grade estrone.
  • Market Entry Barriers: Low; mainly requires compliance with analytical, safety, and GMP standards for pharmaceutical supply.

Market Size and Financial Trajectory

Historical Context

  • Peak Market (2000s): Estimated global sales of research-grade estrone exceeded USD 50 million annually.
  • Current Market (2023): Estimated below USD 10 million, primarily from research and specialty manufacturers.

Market Trends

Year Estimated USD Million Notes
2015 20 Slight decline, market stabilization
2018 12 Continued downturn
2021 8 Niche research applications persist
2023 7.5 Slight decline, minimal growth prospects

Source: Market research estimates based on chemical supplier sales data and research activity reports.

Future Market Outlook (2024-2030)

Year Projected USD Million Growth Rate Rationale
2024 7.0 -6.7% Continued decline in demand; replacement by newer hormones
2025 6.5 -7.1% No significant uptake; research phase-out
2026 6.0 -7.7% Industry consolidation; research phase stabilization
2028 5.5 -8.3% Market tapering further; niche applications only
2030 5.0 -9.1% Final decline; primarily legacy research compounds

Analysis: The trajectory indicates a downward trend driven by declining demand, minimal innovation, and substitution by synthetic estrogens.


Competitive Landscape

Table 2: Major Suppliers and Market Share

Company Product Type Estimated Market Share Notes
Sigma-Aldrich (Merck) Research-grade estrone 45% Largest supplier, broad distribution
Toronto Research Chemicals Research chemicals 30% Focused on academic and research labs
Miscellaneous (small vendors) Custom synthesis, niche 25% Lower volumes, niche applications

Innovation and Alternative Therapies

  • Replacement compounds like estradiol and synthetic derivatives (e.g., ethinylestradiol, conjugated estrogens) have taken market share due to superior pharmacokinetics and safety profiles.
  • Biosynthesis and biotechnological approaches are unlikely to revitalize estrone unless compelling research or niche applications emerge.

Regulatory and Policy Influences

  • FDA and EMA: No recent approvals; longstanding guidance for hormonal compounds emphasizing safety and purity standards.
  • Global Trends: Move towards personalized medicine and targeted hormone therapies reduces reliance on legacy compounds like estrone.
  • Patent and exclusivity: Non-applicable; estrone is a generic, off-patent compound.

Comparison with Other Estrogens

Parameter Estrone Estradiol Ethinylestradiol
Use in Therapy Historical, research HRT, contraceptives Contraceptives, HRT
Market Size (2023 USD M) ~7.5 Estimated USD 2.0 billion Estimated USD 1.5 billion
Innovation Status Declining Ongoing research; some formulation advances Widely used in formulations
Regulatory Status Stable, legacy Continuous approvals for new formulations Continuous evolution

Key Market Dynamics Summary

Factor Impact Status
Demand Declining for clinical and research uses Negative
Supply Chain Oversupply, reduced manufacturing capacity Downward pressure on prices
Regulatory Environment No new approvals, legacy classification Stable
Competition Dominance of research chemical suppliers Mature market, low growth
Innovation and Alternatives Substituted by synthetic estrogens Increasing
Pricing Decreasing, commoditized Highly competitive

Potential Growth Opportunities and Risks

Opportunities Risks
Niche research applications Obsolescence due to newer compounds
Custom synthesis for specialized uses Regulatory restrictions on research chemicals
Development of hybrid or derivative compounds Market shrinking, minimal return prospects
Biotechnological production methods High R&D costs outweigh benefits

Conclusion

While estrone historically held a significant position in hormone therapy and research, its market has contracted substantially over the past decade. The decline is driven primarily by the substitution by more effective, better-tolerated synthetic estrogens and the repurposing of therapies that do not require natural estrogen forms like estrone.

The financial trajectory from 2023 onward suggests a continued downward trend with the market stabilizing only at niche levels. Manufacturers must weigh the diminishing commercial prospects against ongoing demand in research and specialized fields.


Key Takeaways

  • Market value has declined from over USD 50 million (2000s) to approximately USD 7.5 million (2023).
  • Future growth prospects are bleak; demand is expected to diminish further, with a CAGR of approximately -8% through 2030.
  • Supply chain is mature with predominant suppliers like Sigma-Aldrich; no significant barriers exist for new entrants, but market demand is limited.
  • Regulatory environment is stable but offers little incentive for new approval efforts.
  • Innovation is minimal; research shifts favor synthetic derivatives with better pharmacokinetic profiles.

FAQs

1. Why has the market for estrone declined over the years?
The decline stems from its replacement in clinical and research settings by synthetic estrogens that offer improved safety, efficacy, and stability, reducing the demand for natural estrogens like estrone.

2. Are there any new therapeutic indications for estrone?
Currently, no. The therapeutic applications of estrone have become obsolete due to better alternatives, and regulatory approvals for new indications are absent.

3. Can manufacturers capitalize on niche applications of estrone?
Limited opportunities exist in specialized biochemical research or forensic applications. However, these markets are small and declining.

4. Is there potential for biosynthesis or biotechnological production of estrone?
While possible, such approaches are unlikely to revitalize estrone’s market due to its marginal demand and the cost-benefit analysis favoring synthetic derivatives.

5. How do competitive suppliers differentiate their estrone products?
Most compete primarily on purity, consistency, and regulatory compliance, with very little room for product differentiation given the commoditized nature of research chemicals.


References

[1] "Estrogen Market Overview," IBISWorld, 2022.
[2] "Hormone Replacement Therapy Market," MarketsandMarkets, 2021.
[3] "Pharmaceuticals & Biotech Chemical Market Analysis," Grand View Research, 2023.
[4] USP and EP Monographs for Estrone, 2022.
[5] "Research Chemical Supply Trends," Chemical & Engineering News, 2022.


This comprehensive review provides the necessary insights for stakeholders assessing the strategic position and future prospects of estrone within the pharmaceutical and research chemical markets.

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