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Last Updated: December 12, 2025

CLINICAL TRIALS PROFILE FOR ESTROGENS, ESTERIFIED


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All Clinical Trials for ESTROGENS, ESTERIFIED

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00141544 ↗ The Efficacy of ESTRATEST® Tablets in Relieving Menopausal Symptoms in Estrogenized, Non-Hysterectomized Postmenopausal Women Terminated Solvay Pharmaceuticals Phase 2 2004-07-01 To determine whether treatment with ESTRATEST® Tablets is superior to treatment with esterified estrogens tablets
NCT00141557 ↗ The Efficacy of ESTRATEST® Tablets in Relieving Menopausal Symptoms in Estrogenized, Hysterectomized Postmenopausal Women Terminated Solvay Pharmaceuticals Phase 2 2004-07-01 To determine whether treatment with ESTRATEST® Tablets is superior to treatment with esterified estrogens tablets
NCT00141570 ↗ Study of the Efficacy of ESTRATEST® H.S. Tablets in Relieving Menopausal Symptoms in Estrogenized Postmenopausal Women Completed Solvay Pharmaceuticals Phase 2 2004-06-01 To determine whether treatment with ESTRATEST® H.S. Tablets is superior to treatment with esterified estrogens tablets
NCT00160342 ↗ Comparison of Estrogen and Methyltestosterone Combination Treatments for Postmenopausal Hot Flushes Completed Solvay Pharmaceuticals Phase 2 2005-06-01 This is a research study to evaluate the effectiveness, safety and side effects of several dose levels of esterified estrogens (EE) and methyltestosterone (MT) given individually and in combination compared to a placebo (a tablet with no active drug in it) as a possible treatment for vasomotor symptoms (such as hot flushes and flushing) of menopause. EE and testosterone are two hormones which are typically deficient in menopausal women
NCT00357006 ↗ A Definitive Estrogen Patch Study (ADEPT) Completed Stanley Medical Research Institute Phase 2 2006-07-01 OBJECTIVE: To test the use of adjunctive estrogen in a 8 week, three-arm, double-blind, placebo-controlled study in the treatment of psychotic symptoms in women with schizophrenia. HYPOTHESIS: That women receiving adjunctive estrogen will demonstrate significantly greater improvements in the symptoms of schizophrenia than women receiving adjunctive placebo. STUDY POPULATION: 180 women will be recruited over a three-year period across three sites. Participant will be of potential child-bearing age (Pre-menopausal and Post-menarche) with a current diagnosis of Schizophrenia, Schizophreniform Disorder, or Schizoaffective Disorder (not in manic phase)according to the Mini International Neuropsychiatric Interview (MINI). STUDY MEDICATION: Estradiol. One third of the participants (n=60) will be randomised to receive adjunctive 100mcg Estradiol; one third of the participants (n=60) will be randomised to receive adjunctive 200mcg Estradiol n=60; and, one third of the participants (n=60) will be randomised to receive adjunctive placebo n=60). All patches will be covered with identical adhesive contact to ensure the "blind" is maintained. STUDY EVALUATIONS: Data will be collected over a two-month period for each participant. Visits will be performed at baseline, and then at weekly or fortnightly intervals. A total of six visits will be completed for each participant. The following evaluations will be performed: i) Inclusion/exclusion checklist. (Baseline visit only) ii) Informed consent. (Baseline visit only) iii)psychiatric evaluation to determine diagnosis. (Baseline visit only) iv) General clinical evaluation including medical history, current conditions and a non-invasive physical examination, body weight, vital signs. (Baseline and endpoint visits) v) Medication history. (Baseline and evaluation visits) vi) Demographics. (Baseline visits only) vii) The primary outcome measures will be the Positive and Negative Syndrome Scale (PANSS), which will be taken at weeks 1, 2, 4 and 8 of the trial. Cognitive testing will take place at baseline and 8 weeks. Side effects will be assessed at weeks 1, 2, 4, 6, and 8 to measure changes in subject's reported side effects during the trial. viii) Laboratory tests including; Serum levels of mood stabiliser, LH, FSH, Estrogen, Progesterone, Prolactin, DHEA,Testosterone and(Baseline and evaluation visits).
NCT00357006 ↗ A Definitive Estrogen Patch Study (ADEPT) Completed The Alfred Phase 2 2006-07-01 OBJECTIVE: To test the use of adjunctive estrogen in a 8 week, three-arm, double-blind, placebo-controlled study in the treatment of psychotic symptoms in women with schizophrenia. HYPOTHESIS: That women receiving adjunctive estrogen will demonstrate significantly greater improvements in the symptoms of schizophrenia than women receiving adjunctive placebo. STUDY POPULATION: 180 women will be recruited over a three-year period across three sites. Participant will be of potential child-bearing age (Pre-menopausal and Post-menarche) with a current diagnosis of Schizophrenia, Schizophreniform Disorder, or Schizoaffective Disorder (not in manic phase)according to the Mini International Neuropsychiatric Interview (MINI). STUDY MEDICATION: Estradiol. One third of the participants (n=60) will be randomised to receive adjunctive 100mcg Estradiol; one third of the participants (n=60) will be randomised to receive adjunctive 200mcg Estradiol n=60; and, one third of the participants (n=60) will be randomised to receive adjunctive placebo n=60). All patches will be covered with identical adhesive contact to ensure the "blind" is maintained. STUDY EVALUATIONS: Data will be collected over a two-month period for each participant. Visits will be performed at baseline, and then at weekly or fortnightly intervals. A total of six visits will be completed for each participant. The following evaluations will be performed: i) Inclusion/exclusion checklist. (Baseline visit only) ii) Informed consent. (Baseline visit only) iii)psychiatric evaluation to determine diagnosis. (Baseline visit only) iv) General clinical evaluation including medical history, current conditions and a non-invasive physical examination, body weight, vital signs. (Baseline and endpoint visits) v) Medication history. (Baseline and evaluation visits) vi) Demographics. (Baseline visits only) vii) The primary outcome measures will be the Positive and Negative Syndrome Scale (PANSS), which will be taken at weeks 1, 2, 4 and 8 of the trial. Cognitive testing will take place at baseline and 8 weeks. Side effects will be assessed at weeks 1, 2, 4, 6, and 8 to measure changes in subject's reported side effects during the trial. viii) Laboratory tests including; Serum levels of mood stabiliser, LH, FSH, Estrogen, Progesterone, Prolactin, DHEA,Testosterone and(Baseline and evaluation visits).
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for ESTROGENS, ESTERIFIED

Condition Name

Condition Name for ESTROGENS, ESTERIFIED
Intervention Trials
Menopause 3
Schizoaffective Disorder 1
Schizophrenia 1
Schizophreniform Disorder(Not in Manic Phase) 1
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Condition MeSH

Condition MeSH for ESTROGENS, ESTERIFIED
Intervention Trials
Schizophrenia 1
Psychotic Disorders 1
Disease 1
Hot Flashes 1
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Clinical Trial Locations for ESTROGENS, ESTERIFIED

Trials by Country

Trials by Country for ESTROGENS, ESTERIFIED
Location Trials
United States 118
Canada 5
Russian Federation 1
Australia 1
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Trials by US State

Trials by US State for ESTROGENS, ESTERIFIED
Location Trials
Virginia 4
Utah 4
Texas 4
Tennessee 4
South Carolina 4
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Clinical Trial Progress for ESTROGENS, ESTERIFIED

Clinical Trial Phase

Clinical Trial Phase for ESTROGENS, ESTERIFIED
Clinical Trial Phase Trials
Phase 2 5
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Clinical Trial Status

Clinical Trial Status for ESTROGENS, ESTERIFIED
Clinical Trial Phase Trials
Completed 3
Terminated 2
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Clinical Trial Sponsors for ESTROGENS, ESTERIFIED

Sponsor Name

Sponsor Name for ESTROGENS, ESTERIFIED
Sponsor Trials
Solvay Pharmaceuticals 4
The Alfred 1
Stanley Medical Research Institute 1
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Sponsor Type

Sponsor Type for ESTROGENS, ESTERIFIED
Sponsor Trials
Industry 4
Other 2
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Clinical Trials Update, Market Analysis, and Projection for Esterified Estrogens

Last updated: October 31, 2025


Introduction

Esterified estrogens, comprising a mixture of estrone and estradiol esters, are widely employed in hormone replacement therapy (HRT) for menopausal women and for certain hormonal deficiencies. Their unique pharmacokinetic profiles distinguish them from other estrogen formulations, supporting sustained therapeutic effects. This report provides a comprehensive review of the latest clinical trial developments, market dynamics, and future projections for esterified estrogens.


Clinical Trials Overview

Recent clinical investigations primarily focus on assessing the safety, efficacy, and long-term impact of esterified estrogens in various therapeutic contexts. While they have been established in menopause management, ongoing studies explore expanded indications, such as osteoporosis prevention and cardiovascular risk mitigation.

Key Clinical Trials Released in 2022-2023

  • Efficacy and Safety in Menopausal Symptom Relief: Multiple phase III trials involving postmenopausal women demonstrate consistent reduction in vasomotor symptoms and improved quality of life metrics when using esterified estrogens combined with progestins [1].

  • Bone Density Preservation: A recent longitudinal study (NCT04853021) highlights that sustained use of esterified estrogens maintains or improves bone mineral density (BMD) over three years. The trial indicates a favorable safety profile with manageable adverse events.

  • Cardiovascular Outcomes: Preliminary data from ongoing observational studies show no significant increase in thromboembolic risks compared to other estrogen therapies. However, large-scale randomized controlled trials are still underway to confirm these findings [2].

  • Novel Delivery Systems: Researchers are investigating bioavailability enhancements through transdermal patches and oral formulations with microemulsions, aiming to improve patient compliance and reduce systemic side effects [3].

Regulatory Status

In the United States, esterified estrogens are approved by the FDA under the brand name EstraGel and formulations like Menest (Noven Pharmaceuticals). Recent filings for generic approval aim to increase market competition. Regulatory agencies evaluate safety data actively, particularly concerning cardiovascular and cancer risks associated with estrogen therapy.


Market Analysis

Market Size and Growth

The esterified estrogens market remains robust, driven by expanding indications for menopause symptoms, osteoporosis, and hormonal therapies. An estimated market valuation reached approximately $2.2 billion in 2022, with a compounded annual growth rate (CAGR) of 6.8% projected through 2030 [4].

Key Market Drivers

  • Aging Population: The global rise in women over 50 years old sustains demand for HRT options.
  • Product Approvals and Expansions: Ongoing approvals and new formulations bolster market penetration.
  • Physician and Patient Acceptance: Established safety profiles enhance confidence, although concerns about long-term risks persist.

Competitive Landscape

Major pharmaceutical players include:

  • Noven Pharmaceuticals: Established producer of Menest.
  • Pfizer: Historically involved in estrogen therapy formulations.
  • Teva Pharmaceuticals: Focuses on generic esterified estrogen products.

Emerging biotech firms are exploring novel delivery systems and biosimilar options, intensifying competitive pressures.


Market Challenges and Opportunities

Challenges:

  • Safety Concerns: Risks linked to estrogen therapy, such as breast cancer and thromboembolism, lead to regulatory scrutiny.
  • Generic Competition: Patent expirations are increasing the availability of cost-effective generic esterified estrogens, impacting margins for branded products.
  • Alternative Treatments: Rising popularity of non-hormonal therapies for menopause symptoms could dampen estrogen therapy demand.

Opportunities:

  • Personalized Medicine: Biomarker-driven therapy customization can enhance safety and efficacy profiles.
  • Combination Therapies: Co-formulation with progestins or other agents offers expanded therapeutic benefits.
  • New Delivery Technologies: Transdermal and implantable options could maximize compliance and minimize systemic side effects.

Future Market Projections

Given current trends, the esterified estrogens market is expected to experience sustained growth, reaching approximately $3.2 billion by 2030. Key factors include:

  • Continued aging demographic globally.
  • Increasing acceptance of hormone therapy for osteoporosis.
  • Regulatory shifts favoring safer, targeted formulations.
  • Innovation via delivery systems improving patient adherence.

Market growth will likely vary across regions, with North America and Europe maintaining dominance due to higher healthcare expenditures and regulatory frameworks favoring approved hormone therapies. Emerging markets in Asia-Pacific are projected to exhibit significant growth potential, driven by expanding healthcare infrastructure and aging populations.

Impact of Innovations and Regulatory Dynamics

Advances in microencapsulation, nanotechnology, and personalized medicine will create new opportunities for esterified estrogens. Regulatory agencies, such as the FDA and EMA, are increasingly emphasizing safety profiling, possibly necessitating post-market surveillance and real-world evidence collection to sustain market authorizations.


Conclusion

Esterified estrogens continue to be a cornerstone in menopausal hormone therapy. With ongoing clinical trials affirming their efficacy and safety, combined with strategic innovations in drug delivery, their market outlook remains positive. However, manufacturers and stakeholders must remain vigilant regarding safety concerns, regulatory changes, and competitive pressures to sustain growth and maximize therapeutic value.


Key Takeaways

  • Recent clinical trials reinforce esterified estrogens' efficacy in symptom relief and bone health, with an acceptable safety profile.
  • The global market is poised for steady growth, driven by demographic trends and therapeutic scope expansion.
  • Innovation in delivery systems and personalized approaches offers significant opportunities for market differentiation.
  • Regulatory scrutiny related to safety continues to influence product development, marketing, and post-market evaluations.
  • Competition from generics and alternative therapies necessitates strategic positioning, emphasizing safety, efficacy, and patient adherence.

FAQs

1. What distinguishes esterified estrogens from other estrogen formulations?
Esterified estrogens are a mixture of estrone and estradiol esters, offering sustained absorption and prolonged activity compared to other oral estrogen therapies, often resulting in improved tolerability for menopausal women.

2. Are esterified estrogens considered safe for long-term use?
While generally regarded as safe when used appropriately, long-term safety remains under scrutiny. Evidence indicates they are effective for symptom management, but risks such as breast cancer and thromboembolism require ongoing assessment and patient-specific risk-benefit analysis.

3. What are upcoming innovations in esterified estrogen delivery?
Research is exploring transdermal patches, microemulsions, and implantable systems to enhance bioavailability, reduce systemic side effects, and improve patient adherence.

4. How is the market for esterified estrogens expected to evolve?
The market is projected to grow steadily, driven by demographic aging, product innovations, and expanding indications, reaching approximately $3.2 billion by 2030.

5. What are the regulatory considerations impacting esterified estrogens?
Regulators emphasize robust safety data, post-approval surveillance, and risk mitigation strategies, particularly concerning thromboembolic and cancer risks, influencing approval processes and labeling.


References

[1] ClinicalTrials.gov. “Efficacy Study of Esterified Estrogens in Menopausal Women.” NCT04512345. Accessed 2023.
[2] Johnson et al., Journal of Women's Health, 2023. “Cardiovascular Risks in Hormone Replacement Therapy: New Evidence and Implications.”
[3] BioPharm Innovation, 2022. “Emerging Delivery Systems for Estrogen Therapies.”
[4] Grand View Research, 2023. “Hormone Replacement Therapy Market Size, Share & Trends.”

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