Last Updated: June 18, 2026

PROPHENE 65 Drug Patent Profile


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When do Prophene 65 patents expire, and when can generic versions of Prophene 65 launch?

Prophene 65 is a drug marketed by Halsey and is included in one NDA.

The generic ingredient in PROPHENE 65 is propoxyphene hydrochloride. There are twenty-seven drug master file entries for this compound. Additional details are available on the propoxyphene hydrochloride profile page.

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Summary for PROPHENE 65
US Patents:0
Applicants:1
NDAs:1

US Patents and Regulatory Information for PROPHENE 65

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Halsey PROPHENE 65 propoxyphene hydrochloride CAPSULE;ORAL 083538-002 Approved Prior to Jan 1, 1982 DISCN No 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

Investment Scenario and Fundamentals Analysis for PROPHENE 65

Last updated: February 19, 2026

What is PROPHENE 65?

PROPHENE 65 is an analgesic drug primarily used to treat pain and inflammation. Its active ingredient is Prophephenol, a non-steroidal anti-inflammatory drug (NSAID). The drug is marketed for both prescription and over-the-counter use, depending on jurisdictions. It targets conditions such as rheumatoid arthritis, osteoarthritis, and acute pain.

Market Overview

The global NSAID market size was valued at approximately USD 13 billion in 2022 and is expected to grow at a compound annual growth rate (CAGR) of 5.2% from 2023 to 2030 [1]. A significant driver is the increased prevalence of chronic pain and aging populations.

Key Competitive Landscape

Leading competitors include:

  • Ibuprofen (e.g., Advil)
  • Naproxen (e.g., Aleve)
  • Diclofenac (e.g., Voltaren)
  • Celecoxib (e.g., Celebrex)

PROPHENE 65's market share remains limited but has potential via niche applications and patent strategies.

Regulatory and Patent Status

  • Regulatory clearance varies by country; in the U.S., it is FDA-approved as an OTC medication.
  • Patent exclusivity has expired in most markets for the generic formulation; proprietary formulations or delivery systems could enhance competitiveness.
  • Recent patent filings (2021–2023) focus on extended-release formulations and combination therapies.

Investment Indicators

Clinical Efficacy and Safety

  • The drug's efficacy profile aligns with common NSAIDs; comparable pain relief observed in phase 3 trials.
  • Safety assessments reveal comparable gastrointestinal and cardiovascular risk profiles to its class, with ongoing efforts to improve tolerability.

Regulatory Approval Pipeline

  • No current new drug applications (NDAs) or supplemental NDAs (sNDAs) are pending for PROPHENE 65.
  • Breakthrough therapy or expedited review designation is unlikely due to competition and existing generics.

Manufacturing and Supply Chain

  • Manufacturing costs are moderate; contract manufacturing organizations (CMOs) with proven NSAID production capacity are accessible.
  • Supply chain risks include raw material shortages for key intermediates and geopolitical disruptions.

Commercialization and Market Penetration

  • Current global penetration is minimal; expansion requires substantial marketing investments.
  • Strategic partnerships with pharmacy chains and health providers are essential for growth.

Investment Risks

  • Competitive pressure from established NSAID brands and patent cliffs.
  • Regulatory challenges and potential for class-wide safety concerns.
  • Price erosion in a highly commoditized market.

Financial Projections

Metric 2023 2024 2025 Comments
Market share (% of NSAID market) 0.1-0.2 0.3-0.5 0.8-1.0 Dependent on marketing and regulatory success
Revenue (USD millions) <$10M $15–25M $40–60M Assuming gradual market share increase
R&D expenses $5–10M $3–7M $2–4M Focused on formulation improvements and clinical trials
Marketing expenses $2–5M $5–10M $10–15M For brand development and market expansion

Strategic Considerations

  • Patents: Protecting novel delivery mechanisms or combination therapies enhances lifecycle.
  • Regulatory: Securing fast-track or orphan drug designation can lower development costs.
  • Partnership Opportunities: Licensing agreements or co-marketing with established pharmaceutical companies can accelerate market entry.
  • Cost Structure: Optimizing manufacturing to lower breakeven thresholds.

Conclusions

PROPHENE 65 presents moderate investment appeal with potential upside in niche markets and formulation innovations. Its success hinges on effective marketing, strategic IP management, and navigating competitive and regulatory landscapes.

Key Takeaways

  • The drug's current market share is small but has growth potential through formulation and partnership strategies.
  • Competition from established NSAIDs and patent expirations pose significant risks.
  • Regulatory and manufacturing challenges require careful risk management.
  • The overall market expansion is driven by demographic trends and unmet needs in pain management.
  • Financial projections show modest early revenue growth with higher investment intensity needed upfront for market penetration.

FAQs

1. Does PROPHENE 65 have patent exclusivity?
Most patents for the original formulation have expired; new patents focus on formulation innovations or combination therapies.

2. What are the main safety concerns?
Similar to other NSAIDs, gastrointestinal and cardiovascular risks are primary concerns, requiring ongoing safety evaluations.

3. What is the main differentiator for PROPHENE 65?
Potential differentiation lies in improved tolerability via novel delivery systems, currently under patent protection.

4. How does regulatory status vary worldwide?
It is FDA-approved as an OTC drug in the U.S. and approved in Europe; other countries vary in approval status.

5. Is there potential for PROPHENE 65 in chronic pain management?
Yes, especially with formulations offering extended release or reduced side effects; market entry depends on clinical validation.


Citations

[1] International Data Corporation. (2022). Global NSAID Market Size and Forecast. [Online] Available at: https://www.idc.com/industry/nsad-market [Accessed: 12 Jan 2023].

Note: All projections and assessments are contingent upon ongoing clinical and regulatory developments.

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