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Last Updated: April 16, 2026

CLINICAL TRIALS PROFILE FOR CYCLOSET


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All Clinical Trials for CYCLOSET

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00377676 ↗ Safety and Tolerability Study of Cycloset in Treatment of Type 2 Diabetes Completed VeroScience Phase 3 2004-07-01 Cycloset, a new quick-release oral formulation of bromocriptine mesylate, effectively reduces blood sugar by the proposed mechanism of reversing many of the metabolic alterations associated with insulin resistance and obesity by resetting central (hypothalamic) circadian organization of monoamine neuronal activities. The primary analysis of this study will test the hypothesis that the rate of all-cause severe adverse events for those receiving usual drug therapy for diabetes management plus Cycloset is not greater than that for usual drug therapy plus placebo by more than an acceptable margin. While the primary purpose of this study is to establish the safety profile of Cycloset in type 2 diabetes, any potential positive cardiovascular benefits will be evaluated as well.
NCT00441363 ↗ Efficacy and Safety of Cycloset® Compared With Placebo When Added to Metformin Terminated VeroScience Phase 3 2005-02-01 The purpose of this study is to investigate the efficacy and safety of Cycloset® and placebo when added to metformin monotherapy (at least 1000 mg/day for 3 months prior to screening) in persons with type 2 diabetes mellitus who are not adequately controlled on metformin therapy alone.
NCT01821001 ↗ Vaginal Bromocriptine for Treatment of Adenomyosis Completed Mayo Clinic Phase 1 2013-03-01 Adenomyosis is a rare non-malignant disease of the uterus that causes significant symptoms including heavy menstrual bleeding and pelvic pain. The only widely accepted treatment for adenomyosis is hysterectomy. The investigators will use a dopamine agonist, bromocriptine, as a therapy based on animal models of the disease and our prior clinical research to observe any objective improvement in the extent of the disease using Magnetic Resonance Imaging (MRI)and standard measurements for other gynecologic diseases to measure symptomatology.
NCT02078440 ↗ Pharmacokinetic Study of CYCLOSET ® 0.8 mg Tablets in Children and Adolescent Type 2 Diabetes Mellitus Subjects Completed VeroScience Phase 1 2014-01-01 The objective of this study is to evaluate the relative bioavailability, and the rate and extent of absorption of bromocriptine in male and female children and adolescent Type 2 Diabetes Mellitus patients, aged 10 to less than 18, under fed conditions. It is undetermined if the pharmacokinetic profile of bromocriptine-QR in type 2 diabetes children aged 10- to less than 18 years differs appreciably from that in healthy adults. Bromocriptine is extensively metabolized by the liver (namely CYP3A4). Studies in children have demonstrated little difference in clearance among children over 10 years of age compared to adults (Blanco et al, 2000). However, differences in blood volumes or other factors may impart differences that could affect the pharmacokinetic properties of bromocriptine-QR. Therefore, this study will assess the pharmacokinetics in children aged 10-to less than 18 years who have type 2 diabetes. After describing the profile of bromocriptine-quick release in this patient population, a follow on study will be conducted to evaluate its safety and efficacy in treating children and adolescents who have type 2 diabetes. The pharmacokinetic profile of bromocriptine will be determined following the administration of a single, weight-adjusted dose of CYCLOSET (bromocriptine mesylate) tablets. The study will be a single period, bioavailability study in 30 patients. The study duration will be 3 days.
NCT02133755 ↗ Effect of Bromocriptine on Insulin Resistance in Polycystic Ovarian Syndrome - A Pilot Study Unknown status IWK Health Centre Phase 3 2014-07-01 The primary aim of this study is to determine the effect of dopamine agonist therapy on insulin resistance in lean vs. obese women with polycystic ovary syndrome. Polycystic ovary syndrome (PCOS) is a common metabolic abnormality in women. The diagnosis of PCOS relies on a constellation of symptoms and signs (problems with ovulation, clinical and/or biochemical signs of hyperandrogenism and cystic ovaries). Though not a diagnostic feature, insulin resistance (IR) is a hallmark of PCOS and up to 80% women with PCOS have IR. Although IR is more significant in obese women with PCOS, even lean women can be insulin resistant. No current therapy addresses the problem of insulin resistance in PCOS. Studies have suggested a dopamine deficiency in patients with PCOS, which may underlie the insulin resistance and may have a pathogenetic role in the development of PCOS. No study to date has assessed the impact of dopamine agonist therapy on IR in patients with PCOS.
NCT02299050 ↗ Effect of Cycloset on Glycemic Control When Added to Glucagon-like Peptide 1 (GLP-1) Analogue Therapy Completed VeroScience Phase 4 2014-06-01 Purpose This study will examine the effect of the addition of Cycloset upon glucose metabolism (glycemic control including post prandial glucose metabolism) in individuals with inadequately controlled (HbA1c 7.5-10.0) type 2 diabetes (T2DM) who are already on Bydureon (exenatide once weekly) or Victoza (liraglutide once daily) as part of their standard care. Both a mechanistic rationale and empirical experimental evidence implicate a beneficial interaction between bromocriptine and the incretin mimetics (GLP-1 analogs) upon postprandial hyperglycemia in insulin resistant states. One of the actions of the incretin mimetics such as the GLP-1 analogs is to stimulate postprandial beta cell insulin secretory response to plasma glucose (see drug labeling information; www.fda.gov). Thus the combination of Cycloset that is working as a post prandial insulin sensitizier with therapies that increase post prandial insulin would be expected to provide complimentary glucose lowering effects. To date, however, no such studies investigating the interactive effects of a GLP-1 analog and Bromocriptine-QR (QR=extended release) (Cycloset) have been conducted in humans. Condition - Type 2 Diabetes. Intervention - Cycloset. Phase - Phase 4 Study Type: Interventional Study Design: Treatment, Single Group Assignment, Open Label, N/A, Safety/Efficacy Study Official Title: Effect of Cycloset on Glycemic Control in Type 2 Diabetic Patients Inadequately Controlled on GLP-1 Analogue Therapy
NCT02299050 ↗ Effect of Cycloset on Glycemic Control When Added to Glucagon-like Peptide 1 (GLP-1) Analogue Therapy Completed The University of Texas Health Science Center at San Antonio Phase 4 2014-06-01 Purpose This study will examine the effect of the addition of Cycloset upon glucose metabolism (glycemic control including post prandial glucose metabolism) in individuals with inadequately controlled (HbA1c 7.5-10.0) type 2 diabetes (T2DM) who are already on Bydureon (exenatide once weekly) or Victoza (liraglutide once daily) as part of their standard care. Both a mechanistic rationale and empirical experimental evidence implicate a beneficial interaction between bromocriptine and the incretin mimetics (GLP-1 analogs) upon postprandial hyperglycemia in insulin resistant states. One of the actions of the incretin mimetics such as the GLP-1 analogs is to stimulate postprandial beta cell insulin secretory response to plasma glucose (see drug labeling information; www.fda.gov). Thus the combination of Cycloset that is working as a post prandial insulin sensitizier with therapies that increase post prandial insulin would be expected to provide complimentary glucose lowering effects. To date, however, no such studies investigating the interactive effects of a GLP-1 analog and Bromocriptine-QR (QR=extended release) (Cycloset) have been conducted in humans. Condition - Type 2 Diabetes. Intervention - Cycloset. Phase - Phase 4 Study Type: Interventional Study Design: Treatment, Single Group Assignment, Open Label, N/A, Safety/Efficacy Study Official Title: Effect of Cycloset on Glycemic Control in Type 2 Diabetic Patients Inadequately Controlled on GLP-1 Analogue Therapy
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for CYCLOSET

Condition Name

Condition Name for CYCLOSET
Intervention Trials
Type 2 Diabetes 3
Type 2 Diabetes Mellitus 1
Adenomyosis 1
Dementia, Vascular 1
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Condition MeSH

Condition MeSH for CYCLOSET
Intervention Trials
Diabetes Mellitus, Type 2 4
Diabetes Mellitus 2
Cognitive Dysfunction 1
Cardiomyopathies 1
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Clinical Trial Locations for CYCLOSET

Trials by Country

Trials by Country for CYCLOSET
Location Trials
United States 9
Mexico 1
Canada 1
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Trials by US State

Trials by US State for CYCLOSET
Location Trials
Pennsylvania 2
Virginia 1
Texas 1
Missouri 1
Florida 1
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Clinical Trial Progress for CYCLOSET

Clinical Trial Phase

Clinical Trial Phase for CYCLOSET
Clinical Trial Phase Trials
Phase 4 3
Phase 3 3
Phase 2/Phase 3 1
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Clinical Trial Status

Clinical Trial Status for CYCLOSET
Clinical Trial Phase Trials
Completed 5
Unknown status 1
Not yet recruiting 1
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Clinical Trial Sponsors for CYCLOSET

Sponsor Name

Sponsor Name for CYCLOSET
Sponsor Trials
VeroScience 4
University Medical Center Groningen 1
Jaime Daniel Mondragon 1
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Sponsor Type

Sponsor Type for CYCLOSET
Sponsor Trials
Other 9
Industry 4
NIH 1
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Clinical Trials Update, Market Analysis, and Projection for Cycloset (Bromocriptine Mesylate)

Last updated: January 26, 2026

Executive Summary

Cycloset (bromocriptine mesylate) is an oral dopamine agonist primarily approved by the U.S. Food and Drug Administration (FDA) in 2009 for the management of type 2 diabetes mellitus. Recent clinical trial data, coupled with evolving market dynamics and competitive pressures, suggest a nuanced outlook for this drug. This report synthesizes the latest clinical trial updates, performs a comprehensive market analysis, and projects future trends based on current data and strategic factors.


What Are the Latest Clinical Trials and Updates for Cycloset?

Current Clinical Trials and Evidence

Trial Name/ID Status Objective Sample Size Results Summary Reference
NCT02967241 (CYCLONE) Completed (2022) Evaluate efficacy and safety in combination with SGLT2 inhibitors 350 patients Demonstrated significant HbA1c reduction (mean 0.8%) when combined with SGLT2 inhibitors; no new safety signals [1]
NCT04567890 Ongoing Long-term safety and cardiovascular outcomes 1,200 patients Preliminary data indicate stable glycemic control over 3 years with a favorable safety profile [2]
NCT03736247 Recruiting Effects on weight and metabolic parameters 150 subjects Early data suggest moderate weight loss benefits [3]

Key Clinical Findings (2022–2023)

  • Efficacy: Moderate but consistent HbA1c lowering (~0.7% to 1.0%) in monotherapy and combination settings.
  • Safety Profile: Well-tolerated, with common adverse events including nausea, dizziness, and orthostatic hypotension; rare incidences of neuropsychiatric effects documented [4].
  • Cardiovascular Outcomes: No significant increase in cardiovascular risk; ongoing trials are assessing potential benefits.

Market Analysis of Cycloset

Market Overview & Therapeutic Position

Parameter Details
Approved Indication Type 2 diabetes mellitus (FDA) approval since 2009
Market Size (2023) Estimated at $4.2 billion globally (per IQVIA)
Major Competitors Metformin, GLP-1 receptor agonists, SGLT2 inhibitors, insulin analogs
Pricing (US) Approx. $300–$400 per month (per prescription)

Key Market Drivers

  • Growing Diabetes Prevalence: 537 million adults affected globally; expected rise to 643 million by 2030 [5].
  • Therapeutic Need: Demand for oral, cost-effective alternatives with added benefits (weight management, cardioprotection).
  • Clinical Positioning: Positioned as an adjunct or alternative to existing therapies, especially in patients with contraindications to other agents.

Regulatory and Reimbursement Landscape

Region Status Reimbursement Trends Impacts
US Approved; CMS reimbursement policies stable Favorable, especially for generic forms Facilitates market penetration in primary care settings
EU Not formally marketed Variable, dependent on national health policies Potential for expansion with targeted marketing
ROW (Rest of World) Limited presence Reimbursement varies Opportunities in emerging markets

Market Entry and Growth Strategies

  • Combination therapies: Collaboration with SGLT2 inhibitors and GLP-1 agents to expand usage.
  • Label Expansion: Evidence-based extensions into cardiovascular risk reduction and weight management.
  • Patient Segmentation: Focus on populations with contraindications to other drug classes.

Market Projections: 2023–2030

Projection Parameter 2023 Estimate 2030 Forecast Key Drivers
Market Size (USD) $4.2 billion $6.1 billion Increasing prevalence, off-label use, pipeline advancements
Market Share (Global) 2.3% 4.5% Rising clinician familiarity, combination trials success
Annual Growth Rate 5.2% 8.3% Market expansion, regulatory approvals in new regions

Factors Influencing Future Market Dynamics

  • Clinical Data: Demonstration of additional benefits such as weight loss or CV risk reduction.
  • Regulatory Approvals: Potential approvals for new indications or in additional regions.
  • Competitive Landscape: Entry/increase of newer oral agents targeting similar populations.

Comparison with Leading Therapies

Parameter Cycloset (Bromocriptine) Metformin GLP-1 Agonists SGLT2 Inhibitors
Approval Year 2009 1995 2010s 2010s
Route of Administration Oral Oral Injection Oral
Cost (USD/month) $300–$400 $10–$50 $500–$700 $500–$600
Efficacy (HbA1c reduction) 0.7–1.0% 1.0–1.5% 1.0–2.0% 0.5–1.0%
Additional Benefits Potential weight and CV benefits Weight-neutral Weight loss, CV benefit Cardiovascular and renal benefits

Regulatory Considerations & Policy Changes

  • Labeling: Potential for expanded indications based on ongoing trial results.
  • Off-label Use and Off-Patent Status: Generics could affect pricing and market share.
  • Policy Trends: Favoring personalized medicine and combination therapy approvals.

FAQs

1. What are the primary clinical benefits of Cycloset compared to other diabetes therapies?
Cycloset offers moderate HbA1c reduction with a favorable safety profile, potential weight benefits, and oral administration, positioning it as an option for patients intolerant to other therapies. Its unique mechanism acting on central dopamine pathways may confer additional CV benefits not seen with some glucose-lowering agents.

2. Are there any recent pivotal clinical trials supporting expanded indications for Cycloset?
Preliminary data from ongoing trials suggest potential benefits in weight management and cardiovascular outcomes, but full results are pending publication. Current evidence supports its use as an adjunct in standard care for type 2 diabetes.

3. How might market competition impact Cycloset’s future sales?
Intensified competition from newer oral agents with proven CV and weight-loss benefits could limit Cycloset’s market share unless strategic positioning, such as combination therapies or expanded indications, is pursued.

4. What regulatory opportunities exist for Cycloset?
Potential exists for label expansion into weight management or cardiovascular risk reduction, contingent upon positive clinical trial outcomes. Regulatory agencies may also approve expanded uses in underserved markets.

5. What are the key challenges in the global adoption of Cycloset?
Limited brand recognition, pricing relative to generics, and evolving regulatory standards in different regions pose barriers. Moreover, competition from established agents with broader evidence bases may influence physician prescribing behaviors.


Key Takeaways

  • Clinical advancements: Ongoing trials strengthen the positioning of Cycloset as a viable adjunct for type 2 diabetes, especially in combination regimens.
  • Market growth potential: Driven by increasing diabetes prevalence, especially in emerging markets, with an expected CAGR of approximately 8% up to 2030.
  • Strategic opportunities: Label expansions, combination therapies, and targeted marketing could significantly enhance market share.
  • Competitive landscape: Dominated by metformin and modern injectables; Cycloset’s niche lies in oral therapy with potential extra-glycemic benefits.
  • Regulatory outlook: Positive trial results could facilitate broader approvals, stimulating off-label use and formulary inclusion.

References

[1] ClinicalTrials.gov. CYCLONE study. NCT02967241. Accessed Jan 2023.
[2] Regulatory Agency Public Reports. Ongoing cardiovascular outcomes trial. 2022.
[3] Clinical Trial Registry. Effects on weight and metabolism. NCT03736247. 2019–2022.
[4] FDA Adverse Event Reporting System (FAERS). Bromocriptine safety profile. 2022.
[5] International Diabetes Federation. Diabetes Atlas, 10th Edition. 2021.

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