Last Updated: June 25, 2026

CLINICAL TRIALS PROFILE FOR PROBUCOL


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All Clinical Trials for probucol

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00276133 ↗ Effects of Atorvastatin Versus Probucol on Small Dense LDL Completed Yokohama City University Medical Center Phase 4 2004-01-01 Small dense low-density lipoprotein (LDL) plays an important role in causing glomerular injury through conversion to an oxidatively modified form of LDL. However, few studies evaluated the effects of antilipidemic agents on the LDL particle size and renoprotective actions in hyperlipidemic patients with non-diabetic nephropathy.
NCT00426348 ↗ A Study of the Antioxidant Probucol Combined With Valsartan in Patients With IgA Nephropathy Completed Guangdong General Hospital Phase 4 2007-05-01 a statement of the study hypothesis:the effect of valsartan in patients with IgA nephropathy have been proved,and the efficacy of probucol in combination with valsartan is to be proved in patients with IgA nephropathy. This is a prospective randomized controlled, double blinded pilot study to identify the efficacy of probucol in combination with valsartan in patients with IgA nephropathy. The renal function deterioration will be the primary outcome studied. The expected study duration will be 36 months.
NCT00426348 ↗ A Study of the Antioxidant Probucol Combined With Valsartan in Patients With IgA Nephropathy Completed Guangdong Provincial People's Hospital Phase 4 2007-05-01 a statement of the study hypothesis:the effect of valsartan in patients with IgA nephropathy have been proved,and the efficacy of probucol in combination with valsartan is to be proved in patients with IgA nephropathy. This is a prospective randomized controlled, double blinded pilot study to identify the efficacy of probucol in combination with valsartan in patients with IgA nephropathy. The renal function deterioration will be the primary outcome studied. The expected study duration will be 36 months.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for probucol

Condition Name

Condition Name for probucol
Intervention Trials
Healthy 3
Diabetic Nephropathy 2
Type 2 Diabetes Mellitus 2
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Condition MeSH

Condition MeSH for probucol
Intervention Trials
Kidney Diseases 5
Ischemic Stroke 4
Atherosclerosis 3
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Clinical Trial Locations for probucol

Trials by Country

Trials by Country for probucol
Location Trials
Korea, Republic of 23
China 12
Canada 1
Japan 1
Philippines 1
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Clinical Trial Progress for probucol

Clinical Trial Phase

Clinical Trial Phase for probucol
Clinical Trial Phase Trials
PHASE3 1
Phase 4 13
Phase 3 1
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Clinical Trial Status

Clinical Trial Status for probucol
Clinical Trial Phase Trials
Completed 14
Unknown status 5
RECRUITING 2
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Clinical Trial Sponsors for probucol

Sponsor Name

Sponsor Name for probucol
Sponsor Trials
Korea Otsuka Pharmaceutical Co., Ltd. 8
Otsuka Beijing Research Institute 7
Guangdong General Hospital 2
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Sponsor Type

Sponsor Type for probucol
Sponsor Trials
Industry 16
Other 15
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PROBUCOL (bucolome) clinical trials update, market analysis, and exclusivity-driven projection

Last updated: May 22, 2026

ProbuCol (bucolome) is not in active late-stage global clinical development under a clearly identifiable modern FDA-facing program, and its market exposure is constrained by the product’s age, limited branded availability, and the likelihood that many jurisdictions treat it as off-patent or minimally patent-protected. Near-term market projection is therefore driven primarily by residual prescription volume, generics/biosimilar-like substitution (if any local equivalents exist), and regulatory stocking/distribution continuity rather than by new Phase 3 launches.

What clinical trials exist for ProbuCol (bucolome) and what is the latest update?

Are there active Phase 3 or Phase 4 trials for bucolome?

No current, clearly evidenced active Phase 3/Phase 4 bucolome development program is identifiable from the available public trial record that would support a credible “latest update” narrative tied to outcomes, enrollment completion, or regulatory submission. The historical clinical footprint for bucolome is dominated by earlier-era studies focused on dyslipidemia and antioxidant mechanisms.

What were the main historical trial purposes?

Publicly described clinical work around bucolome has centered on:

  • Lipid modulation in hypercholesterolemia contexts
  • Antioxidant activity and oxidative stress biomarkers
  • Cardiovascular risk surrogate endpoints rather than modern CVOT endpoints typical of 2010s+ approvals

Trial identifiers and registry signals (what to rely on)

For a decision-grade update, the only defensible “latest trial” signal would come from:

  • ClinicalTrials.gov “Status” fields changing to Recruiting/Enrolling by Invitation/Active not recruiting with posted protocol updates
  • EU Clinical Trials Register entries with current status
  • Published results with journal publication dates that align with trial registry “Results posted”

No such sequence is evidenced here in a way that supports an accurate, specific update for “latest” trial status.

How big is the ProbuCol (bucolome) market and who buys it?

What is the market structure?

ProbuCol is a legacy lipid-modifying/antioxidant product. Markets for legacy brands tend to look like:

  • Small, stable volume in geographies where supply is maintained
  • Disproportionate dependence on local reimbursement rules and formulary access
  • Higher volatility around manufacturing continuity and distributor inventory

End-user segments

The primary buyers are:

  • Outpatient cardiometabolic care settings where statin-intolerant or alternative lipid therapies may still be used
  • Older patient cohorts with longstanding treatment histories
  • Regions where bucolome retains local acceptance despite newer lipid-lowering standards

Geographic exposure: what matters most

Because ProbuCol’s profile is historical rather than modern global franchise-driven, the highest commercial relevance usually sits in:

  • Countries with persistent generics availability that keep price low but maintain access
  • Countries where the brand continues to be sold without broad therapeutic substitution

Without verified territory-level sales data, the decision-grade conclusion is that global market size is comparatively small and supply-policy sensitive rather than growth-opportunity driven.

What drives ProbuCol demand versus competing lipid therapies?

Key demand drivers

  • Limited therapeutic switching in patients stabilized on bucolome
  • Access constraints to alternative non-statin options in some settings
  • Clinician familiarity in certain markets
  • Pricing and reimbursement dynamics relative to statins and newer add-ons (especially when cost-sharing is high)

Key substitution risks

  • Statin standard-of-care adoption and guideline concordance
  • Broad availability of generic statins and inexpensive lipid-lowering options
  • Practical preference for therapies with larger outcomes evidence bases from modern trials

What is the patent and exclusivity status of ProbuCol (bucolome)?

ProbuCol is an older small-molecule product. The business impact is that exclusivity-backed growth is not a plausible near-term lever. For a projection model, the relevant conclusion is:

  • Any remaining IP protection is unlikely to create a meaningful “block” against generic entry that would materially change unit supply versus off-patent access.
  • Market outcomes are therefore dominated by distribution, local regulatory status, and the availability of any equivalent products, not by a current exclusivity wall.

When does ProbuCol (bucolome) lose exclusivity and what does that mean for generics?

Given the legacy nature of bucolome, the exclusivity-driven timeline is not a credible gating factor for near-term entry. Generics risk is better modeled as:

  • Ongoing presence of equivalents where regulatory listings exist
  • Periodic supply disruptions that cause temporary demand spikes or substitution churn

If a jurisdiction already has generic equivalents, “loss of exclusivity” is no longer determinative.

What generic entry risks exist for ProbuCol (bucolome)?

Scenario set for decision modeling

For legacy bucolome, the practical entry scenarios are:

  1. Existing equivalents remain dominant and branded share erodes slowly
  2. New local entrants occur only if there is a manufacturing/economic incentive plus regulatory pathway clarity
  3. Supply disruptions reduce availability and temporarily shift demand

What would trigger a material shift?

  • Loss of local brand manufacturing capability
  • Sudden regulatory actions impacting product quality or marketing authorization
  • Reimbursement changes that alter formulary placement

How does ProbuCol (bucolome) compare with statins and newer lipid-lowering options?

Comparative positioning

  • ProbuCol is an antioxidant/lipid-modifying legacy therapy rather than a modern high-evidence CV outcomes franchise.
  • Statins (and many add-on classes) dominate guideline pathways because they have large outcomes datasets and broad guideline integration.

Competitive set likely relevant to prescribers

  • Generic statins as first-line or cost-effective backbone
  • Non-statin options used in statin intolerance contexts (depending on jurisdictional availability)

What does the Orange Book status of ProbuCol (bucolome) indicate?

No decision-grade Orange Book analysis is possible here because:

  • ProbuCol is not reliably associated with an identifiable current US Orange Book listing set in the information available in this response.
  • Without verified US listing data (application numbers, listed patents, expiration dates), any “Orange Book status” statement would be speculative.

What patent litigation affects ProbuCol (bucolome)?

No current, identifiable bucolome-related patent litigation record is evidenced here in a way that supports a factual litigation update, such as:

  • Filed complaints
  • Paragraph IV dockets
  • Consent judgments or settlements tied to a generic/bioequivalent entry

What formulations of ProbuCol (bucolome) are protected and what delivery risks exist?

ProbuCol is sold in established oral dosage forms historically. For a high-quality “formulation protection” analysis, one would need:

  • Listed patents covering specific dosage strengths, compositions, or release properties
  • Manufacturing method patents tied to process constraints

No such verified patent-to-formulation mapping is included here in a way that can be stated as fact.

Market projection for ProbuCol (bucolome): base, downside, and upside scenarios

Modeling logic (what actually moves the needle)

Because there is no evidenced late-stage development tailwind, projections hinge on:

  • Residual brand-equivalent prescription volume
  • Share drift to alternatives (statins and other lipid therapies)
  • Supply continuity and reimbursement stability
  • Any incremental generic equivalent availability

Base case (most likely)

  • Flat to low single-digit decline in units over the next 3 to 5 years due to aging patient populations and continued substitution to modern lipid therapies.
  • Revenue trends depend on price maintenance versus erosion from local equivalents.

Downside case

  • Supply interruption or tighter reimbursement causes more pronounced volume loss.
  • Share shifts accelerate to other lipid therapies, resulting in faster decline.

Upside case

  • Local formulary changes or improved access in specific markets maintains or slightly stabilizes prescriptions.
  • No new clinical repositioning is assumed, so upside remains modest.

How should investors and licensors underwrite ProbuCol (bucolome) given limited growth catalysts?

Underwriting checklist

  • Focus on territory-level availability and reimbursement, not on new trial timelines.
  • Stress-test for supply continuity and local regulatory status.
  • Treat IP as secondary to distribution and substitution risk.

What kind of deal economics make sense

  • If licensing exists, it is more likely to reflect legacy product exploitation and distribution rights than breakthrough IP value.
  • Value would be concentrated in markets with stable access and less aggressive substitution.

Key Takeaways

  • No clearly evidenced late-stage (Phase 3/4) bucolome clinical development update is available here that would drive a near-term regulatory or demand inflection.
  • ProbuCol market exposure is legacy-driven, small, and sensitive to local availability and reimbursement rather than exclusivity-based growth.
  • Near-term projections should assume flat-to-declining units with modest revenue variability driven by pricing and substitution to standard lipid therapies.
  • IP and litigation are unlikely to be the dominant determinants of near-term market outcomes.

FAQs

  1. Is bucolome (ProbuCol) currently being studied for new indications in Phase 2 or Phase 3?
  2. Which countries still market ProbuCol (bucolome) and how does local reimbursement affect demand?
  3. Are there FDA-equivalent regulatory listings today for ProbuCol (bucolome) that show active patents or exclusivity?
  4. What is the most likely substitution pattern for ProbuCol prescriptions versus generic statins?
  5. How do supply disruptions or distributor changes typically impact utilization of legacy lipid therapies like ProbuCol?

References

  1. U.S. National Library of Medicine. ClinicalTrials.gov (bucolome entries).
  2. European Medicines Agency. EU Clinical Trials Register (bucolome).

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