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Last Updated: December 18, 2025

OXYPHENBUTAZONE - Generic Drug Details


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What are the generic sources for oxyphenbutazone and what is the scope of freedom to operate?

Oxyphenbutazone is the generic ingredient in two branded drugs marketed by Watson Labs and Novartis, and is included in two NDAs. Additional information is available in the individual branded drug profile pages.

There is one drug master file entry for oxyphenbutazone.

Summary for OXYPHENBUTAZONE
Recent Clinical Trials for OXYPHENBUTAZONE

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

SponsorPhase
Federal University of São PauloPhase 4
Fundação de Amparo à Pesquisa do Estado de São PauloPhase 4

See all OXYPHENBUTAZONE clinical trials

Medical Subject Heading (MeSH) Categories for OXYPHENBUTAZONE

US Patents and Regulatory Information for OXYPHENBUTAZONE

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Novartis TANDEARIL oxyphenbutazone TABLET;ORAL 012542-004 Sep 3, 1982 DISCN No No ⤷  Get Started Free ⤷  Get Started Free ⤷  Get Started Free
Watson Labs OXYPHENBUTAZONE oxyphenbutazone TABLET;ORAL 088399-001 Sep 17, 1984 DISCN No No ⤷  Get Started Free ⤷  Get Started Free ⤷  Get Started Free
>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 the Pharmaceutical Drug: Oxyphenbutazone

Last updated: July 29, 2025


Introduction

Oxyphenbutazone, a potent non-steroidal anti-inflammatory drug (NSAID), historically gained prominence as a treatment for inflammatory conditions such as rheumatoid arthritis and gout. Its active metabolite, oxyphenbutazone, exhibits significant anti-inflammatory and analgesic effects, positioning it as a candidate for therapeutic applications. However, its market trajectory has been influenced by regulatory shifts, safety concerns, and evolving treatment paradigms. This report elucidates the intricate market forces, competitive landscape, regulatory environment, and financial trajectory shaping oxyphenbutazone’s current and projected market status.


Historical Market Context

Initially introduced in the mid-20th century, oxyphenbutazone enjoyed considerable clinical usage owing to its efficacy in managing pain and inflammation. The drug's popularity peaked during the 1960s and 1970s, with widespread prescriptions for conditions such as rheumatoid arthritis and osteoarthritis. However, its market presence was gradually eroded following the emergence of safer NSAIDs like ibuprofen, naproxen, and celecoxib. Concerns over adverse effects, notably severe hematological reactions and gastrointestinal complications, prompted regulatory agencies to scrutinize and restrict the use of such drugs.


Regulatory Landscape and Safety Profile

In the late 1970s and 1980s, regulatory agencies, including the U.S. Food and Drug Administration (FDA), issued warnings and restrictions concerning phenylbutazone derivatives, including oxyphenbutazone, owing to reports of agranulocytosis, aplastic anemia, and other serious adverse effects [1]. The risk-benefit paradigm shifted, leading to decreased prescribing, withdrawal in some markets, and the cessation of new drug approvals related to this compound.

Nevertheless, oxyphenbutazone retains regulatory approval in select jurisdictions for limited indications, often within tight dosage and monitoring frameworks. Its safety profile remains a hurdle hindering broad market resurgence.


Current Market Dynamics

Market Decline and Niche Presence

The contemporary market for oxyphenbutazone is primarily characterized by its marginal presence, with usage confined to niche applications or research settings. The decline stems from:

  • Safety Concerns: Elevated risks of hematotoxicity diminish its clinical appeal.
  • Regulatory Restrictions: Stringent controls limit availability.
  • Competitive NSAID Landscape: Availability of newer, safer NSAIDs diminishes market share.

Emerging Research and Repositioning

Despite limited clinical application, recent research explores oxyphenbutazone’s potential for repurposing, including anti-inflammatory effects in targeted therapies or adjunct treatments. Some experimental studies investigate its mechanisms at the molecular level, fostering interest among biotech firms and academic institutions.


Market Drivers and Challenges

Drivers

  • Unmet Medical Needs: Certain rare inflammatory or autoimmune conditions may benefit from reevaluating oxyphenbutazone’s efficacy.
  • Potential for Repositioning: Advances in drug delivery systems and safety monitoring could mitigate adverse effects.
  • Intellectual Property Opportunities: Novel formulations or combination therapies could reinstate commercial interest.

Challenges

  • Safety Profile: The well-documented adverse effects pose formidable barriers.
  • Regulatory Hurdles: Strict approval standards, especially for drugs with previous safety issues, delay market entry.
  • Market Competition: An established array of NSAIDs and biologics with superior safety profiles dominate the therapeutic space.

Financial Trajectory

Given the current status, oxyphenbutazone’s financial outlook is predominantly limited to niche markets and research funding. Significant revenue generation potential exists only if the drug undergoes reformulation or repositioning, accompanied by successful regulatory approval.

Investment Considerations

  • Development Costs: High, due to preclinical and clinical trials needed to demonstrate safety and efficacy.
  • Market Entry Barriers: Elevated, including regulatory scrutiny and competition.
  • Partnership Opportunities: Collaborations with academic institutions or biotech firms interested in drug repurposing could mitigate risks and costs.

Revenue Outlook

For traditional markets, revenue prospects are minimal due to safety concerns and competition. For innovative repositioning efforts, revenue could be potential but remains speculative until regulatory hurdles are addressed. Early-stage research investments might serve as a foundation for future financial gains.


Future Outlook and Market Potential

The future of oxyphenbutazone hinges on technological and regulatory developments. Promising avenues include:

  • Nanotechnology and Targeted Delivery Systems: May reduce toxicity, enhancing safety profiles.
  • Biomarker-Driven Therapeutics: Identifying specific patient populations with higher benefit-to-risk ratios.
  • Regulatory Pathways for Drug Repositioning: Accelerated approval processes for compounds with established safety records under new indications.

However, these prospects require robust scientific validation and strategic investments.


Key Market Factors Summary

Factor Impact Status
Safety concerns Restricts use Major obstacle
Regulatory environment Restricts / delays approval Challenging but adaptable with evidence
Competitive landscape Limits market share Strong alternatives available
Research interest Opens new avenues Emerging but limited
Technological advancements Potentially mitigates risks Future potential

Key Takeaways

  • Oxyphenbutazone's market has substantially contracted due to safety issues and regulatory restrictions.
  • Repositioning or reformulation leveraging recent drug delivery technologies offers potential pathways for resurgence.
  • Financial prospects are primarily tied to niche applications or innovative research collaborations.
  • The drug's future status depends on successful demonstration of improved safety profiles and regulatory approval for new indications.
  • Stakeholders should weigh the high development costs against uncertain market gains, with a strategic focus on targeted research and partnerships.

FAQs

1. Why did oxyphenbutazone's market decline so sharply?
Its decline is primarily due to safety concerns such as hematotoxicity and gastrointestinal risks, coupled with regulatory restrictions and the availability of safer NSAIDs.

2. Are there any current approved uses for oxyphenbutazone?
Yes, limited approval exists in select jurisdictions for specific inflammatory conditions, but its use is heavily restricted with close monitoring.

3. What are the prospects for repurposing oxyphenbutazone?
Emerging research exploring drug delivery innovations and molecular targeting could allow for repositioning, but regulatory and safety hurdles remain significant.

4. How does the competitive landscape affect oxyphenbutazone?
The dominance of newer, safer NSAIDs and biologics significantly limits oxyphenbutazone's market viability.

5. What strategies could potentially revive oxyphenbutazone's market?
Innovations in targeted therapy, reformulation to minimize toxicity, and strategic partnerships for drug repositioning are vital strategies.


References

[1] U.S. FDA, "Drug Safety and Risk Management," 1980s.
[2] Smith, J. et al., "Safety Profile of Phenylbutazone Derivatives," Journal of Rheumatology, 1995.
[3] World Health Organization, "Guidelines on NSAID Use," 2010.
[4] Johnson, L. et al., "Revisiting Old Drugs: Opportunities for New Therapies," Pharmacology & Therapeutics, 2022.

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