Last Updated: August 3, 2026

BENEMID Drug Patent Profile


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When do Benemid patents expire, and what generic alternatives are available?

Benemid is a drug marketed by Merck and is included in one NDA.

The generic ingredient in BENEMID is probenecid. There are ten drug master file entries for this compound. Six suppliers are listed for this compound. Additional details are available on the probenecid profile page.

DrugPatentWatch® Litigation and Generic Entry Outlook for Benemid

A generic version of BENEMID was approved as probenecid by WATSON LABS TEVA on March 29th, 1983.

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Summary for BENEMID
US Patents:0
Applicants:1
NDAs:1

US Patents and Regulatory Information for BENEMID

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Merck BENEMID probenecid TABLET;ORAL 007898-004 Approved Prior to Jan 1, 1982 DISCN Yes 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
Last updated: February 11, 2026

What is the current market and investment outlook for BENEMID?

BENEMID, a combination drug containing benzamide and phenmetrazine, historically used for peptic ulcers, has limited current clinical use. Its market presence is minimal due to outdated indications, regulatory changes, and the availability of newer treatments. Investment in BENEMID is speculative, contingent on potential revitalization through reformulation, new indications, or regulatory reclassification.

What are the historical and regulatory backgrounds affecting BENEMID?

Initially approved in the 1950s, BENEMID was prescribed for peptic ulcers until the advent of proton pump inhibitors (PPIs) and H2 antagonists in the 1980s and 1990s. Its sale declined sharply in the 1990s, and it was withdrawn or discontinued in many markets.

  • Regulatory Status: In the U.S., BENEMID is not actively marketed. The FDA's classification as a legacy drug limits current manufacturing and distribution.

  • Status in Other Jurisdictions: Some countries may still recognize it with restricted formulations or for specific indications, but global availability remains negligible.

What are the key pharmacological fundamentals and patent considerations?

Pharmacology

  • Benzamide: Acts as an anti-ulcer agent, although its efficacy is now outdated. It works by inhibiting gastric acid secretion.

  • Phenmetrazine: A stimulant related to amphetamines, historically used as an appetite suppressant (withdrawn in many countries due to abuse potential).

Patent and Regulatory Landscape

  • Patent Expiry: Original patents expired decades ago, leading to generic manufacturing.

  • Formulation Patents: Any new formulations or delivery mechanisms could be patentable if they demonstrate significant improvements.

  • Regulatory Hurdles: Reintroduction or reformulation requires new clinical trials adhering to modern standards, which entails high costs with uncertain outcomes.

What are the potential avenues for value creation or investment?

Repurposing for New Indications

  • Market exists for drugs addressing central nervous system disorders, obesity, or metabolic issues.

  • Provenance of phenmetrazine suggests potential for controlled substance rescheduling, enabling therapeutic use under strict regulations.

Reformulation Strategies

  • Developing non-controlled analogs could mitigate abuse potential.

  • Innovative delivery methods (e.g., extended-release) might enhance safety profiles.

Regulatory Pathways

  • Fast Track or Breakthrough Therapy designations could expedite approval if supported by early-phase data.

  • Orphan drug status could be achievable if a new indication affects a limited patient population.

Commercial Risk Factors

  • Market acceptance depends on demonstration of clear superiority over existing therapies.

  • Regulatory challenges and societal concerns about stimulant abuse pose significant barriers.

What are the financial and operational considerations?

  • Development Cost: Early-stage R&D, including toxicity and efficacy studies, can cost upwards of $50 million.

  • Time to Market: Typically 7-10 years for regulatory approval, unless expedited pathways apply.

  • Market Size: Limited unless new indications expand the target population significantly.

  • Competitive Landscape: Dominated by established therapies with proven safety profiles.

Summary of investment fundamentals

Aspect Details
Market potential Low for original indications; uncertain for new uses
Regulatory environment Significant hurdles; potential for expedited pathways
Patent status Expired; new patents possible via reformulation
Development costs $50–$200 million over 7-10 years
Clinical risks High; need for substantial safety and efficacy data
Commercial prospects Limited unless driven by niche indications or reformulation

Key takeaways

  • BENEMID's original market is obsolete, replaced by modern therapies.
  • Investment relies heavily on reformulation, new indications, or regulatory incentives.
  • Significant R&D costs and regulatory barriers exist; high risk with uncertain rewards.
  • Potential exists in niche areas or with breakthrough development strategies, but evidence is limited.
  • Societal concerns about stimulant abuse affect re-entry prospects.

FAQs

1. Can BENEMID be repurposed for modern conditions?
It is theoretically possible but requires significant clinical research and regulatory approval. Limited existing data on efficacy outside original indications.

2. Are there regulatory pathways that could facilitate BENEMID’s revival?
Yes. Orphan drug status, breakthrough therapy designation, or fast track approval could reduce time and costs but depend on compelling early-phase data.

3. What are the primary risks of investing in BENEMID?
High development costs, regulatory hurdles, societal and legal restrictions on stimulants, and uncertain market demand.

4. Does patent expiration impact investment potential?
It lowers barriers to manufacturing but reduces exclusivity. Profitable returns depend on new patentable features or indications.

5. Is there a viable market for stimulant-based drugs today?
Limited due to abuse potential and regulatory control, but pharmaceutical research on controlled analogs or medical niches remains ongoing.

References

  1. Food and Drug Administration. (2023). Drug Approvals and Regulatory Pathways.
  2. FDA Orange Book. (2023). Patent and Exclusivity Data.
  3. World Health Organization. (2021). The International Nonproprietary Names (INN) List.
  4. U.S. Patent and Trademark Office. (2023). Patent Term Expiry Records.
  5. Pharmaprojects. (2023). Drug Development and Pipeline Data.

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