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Last Updated: December 12, 2025

DARVOCET-N 50 Drug Patent Profile


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Which patents cover Darvocet-n 50, and what generic alternatives are available?

Darvocet-n 50 is a drug marketed by Xanodyne Pharm and is included in one NDA.

The generic ingredient in DARVOCET-N 50 is acetaminophen; propoxyphene napsylate. There are sixty-six drug master file entries for this compound. Additional details are available on the acetaminophen; propoxyphene napsylate profile page.

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Summary for DARVOCET-N 50
US Patents:0
Applicants:1
NDAs:1
Raw Ingredient (Bulk) Api Vendors: 1
Clinical Trials: 1
DailyMed Link:DARVOCET-N 50 at DailyMed
Drug patent expirations by year for DARVOCET-N 50
Recent Clinical Trials for DARVOCET-N 50

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

SponsorPhase
Endo PharmaceuticalsPhase 4
University of RochesterPhase 4

See all DARVOCET-N 50 clinical trials

US Patents and Regulatory Information for DARVOCET-N 50

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Xanodyne Pharm DARVOCET-N 50 acetaminophen; propoxyphene napsylate TABLET;ORAL 017122-001 Approved Prior to Jan 1, 1982 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 DARVOCET-N 50

Last updated: July 30, 2025

Introduction
DARVOCET-N 50, a combination analgesic composed of acetaminophen and propoxyphene, historically played a notable role within the pharmaceutical landscape for pain management. Its market trajectory, driven by regulatory changes, emerging safety concerns, and evolving prescribing practices, has experienced significant shifts over the past decade. This analysis explores the key market dynamics influencing DARVOCET-N 50's trajectory and offers a forecast-based perspective on its financial prospects in the current healthcare environment.


Historical Context and Product Profile

DARVOCET-N 50 originated in the mid-20th century as a prescribed pain reliever, combining acetaminophen (paracetamol) with propoxyphene, a narcotic analgesic. Its popularity derived from perceived efficacy and affordability, filling a niche for outpatient analgesic therapy. However, growing evidence of cardiotoxicity and overdose risks led to regulatory scrutiny, culminating in its market withdrawal in many regions.

The U.S. Food and Drug Administration (FDA) officially recommended the withdrawal of propoxyphene-containing drugs—including DARVOCET-N 50—in November 2010 due to safety concerns, primarily the increased risk of cardiac arrhythmias and fatalities associated with overdose or abuse [1].


Regulatory Landscape and Market Contraction

Regulatory Actions

FDA's decision was based on extensive post-marketing data indicating a disproportionately high risk profile. The Agency emphasized that the risks outweighed the benefits, and as a result, all formulations of propoxyphene were removed from the U.S. market. Similar regulatory actions occurred worldwide, effectively banning or heavily restricting the drug's use.

Impact of Regulatory Eliminations

The withdrawal precipitated a sharp decline in DARVOCET-N 50's market presence, transforming it from a commonly prescribed analgesic to a virtually obsolete medication. This created a vacuum in the analgesic market for patients with mild to moderate pain, driving demand for alternative therapies.


Market Dynamics Post-Withdrawal

Shift to Alternative Therapeutics

Post-2010, clinicians transitioned to other analgesic options such as NSAIDs (e.g., ibuprofen, naproxen), acetaminophen alone, or opioids with more favorable safety profiles. The shift was driven by regulatory pressures and increased awareness of drug safety, which in turn impacted the sales and usage of earlier combination drugs like DARVOCET-N 50.

Patent and Commercial Challenges

As a discontinued product, DARVOCET-N 50's patent protection expired long before its market removal. Consequently, no new patent-related revenues or exclusive licensing opportunities exist. Any generic versions faced immediate market withdrawal following regulatory bans, further diminishing the product’s commercial viability.

Emergence of Abuse-Deterrent Formulations and Novel Analgesics

The evolving landscape in pain management has prioritized abuse-deterrent formulations and non-opioid therapies. The rise of pharmacological innovations, including neuromodulation devices, selective receptor modulators, and multimodal analgesics, has further marginalized traditional combination analgesics.

Legal and Litigation Impacts

Following its withdrawal, numerous lawsuits highlighted the adverse effects associated with propoxyphene. The legal environment contributed to the risk profile of related formulations, discouraging pharmaceutical companies from reviving or reformulating DARVOCET-N 50.


Financial Trajectory and Future Outlook

Historical Revenue Performance

Before its market removal, DARVOCET-N 50 generated modest revenues, primarily in outpatient clinics and primary care settings. Its revenues peaked in the late 20th century but declined steadily following safety warnings and eventual regulatory bans.

Current Financial Landscape

Today, DARVOCET-N 50 holds no patent protection, and its market is effectively defunct in jurisdictions enforcing bans. Consequently, any anticipated direct revenue streams are minimal—limited to residual legacy sales in select regions or unregulated markets, which are unlikely to be economically significant.

Potential for Market Reintroduction

Given the established safety concerns, reintroduction of DARVOCET-N 50 as a marketed drug is highly improbable. However, there exists a niche in reformulation attempts seeking to mitigate toxicity, such as developing abuse-deterrent versions or combining alternative compounds.

Pharmacovigilance and Investment Risks

Investing in derivatives or reformulations involves high regulatory, legal, and market risks. The intensely scrutinized landscape for analgesics, especially opioids and opioid-like compounds, further complicates commercialization prospects.

Long-Term Financial Outlook

The future financial trajectory for DARVOCET-N 50 remains bleak without significant reformulation or regulatory approval. Instead, the broader analgesic market is shifting toward non-opioid, non-sedating, and abuse-resistant options, which are expected to drive revenue growth more robustly.


Market Opportunities and Challenges

Opportunities

  • Development of safer, abuse-deterrent reformulations of traditional analgesics.
  • Expansion into developing markets where regulatory environments are more permissive.
  • Niche applications in specific patient populations with limited alternative options.

Challenges

  • Regulatory barriers and safety concerns proven by historical data.
  • Negative public perception and legal liabilities.
  • Competition from newer, innovative pain management solutions.

Conclusion

The market dynamics and financial prospects for DARVOCET-N 50 are characterized by decline and obsolescence following regulatory bans rooted in safety concerns. The drug's historic revenues and market share have eroded significantly, with limited potential for re-entry into the mainstream therapeutic landscape. Stakeholders should focus on innovative, safer analgesic alternatives aligned with contemporary regulatory standards and patient safety priorities.


Key Takeaways

  • Regulatory and safety concerns led to the withdrawal of DARVOCET-N 50 in 2010, sharply curbing its market presence.
  • Market revenues have collapsed post-ban, with negligible future income prospects unless reformulated with enhanced safety profiles.
  • Industry shift towards non-opioid and abuse-deterrent therapies diminishes the likelihood of reintroduction.
  • Legal liabilities and public perception heavily influence the drug's market environment.
  • Investment and development opportunities lie in innovative pain management approaches rather than traditional formulations like DARVOCET-N 50.

FAQs

1. Is DARVOCET-N 50 currently available in any markets?
No. Due to FDA withdrawal and similar regulatory bans globally, DARVOCET-N 50 is essentially unavailable in mainstream markets, with only residual or unregulated sales possible in limited regions.

2. Can DARVOCET-N 50 be reformulated to address safety concerns?
While theoretically possible, reformulating DARVOCET-N 50 to mitigate cardiotoxicity and abuse potential faces significant regulatory, legal, and scientific hurdles, making reintroduction unlikely.

3. What has been the primary impact of regulatory actions on the drug’s market?
Regulatory actions effectively terminated its market presence, eliminated profitability, and shifted prescriber preference towards safer alternatives, thereby rendering the drug obsolete.

4. Are there ongoing legal liabilities associated with DARVOCET-N 50?
Yes. Lawsuits related to propoxyphene's adverse effects historically led to large settlements and increased caution among manufacturers regarding analgesic formulations containing similar components.

5. What is the future outlook for analgesic drugs similar to DARVOCET-N 50?
The future lies in developing non-addictive, abuse-resistant, and targeted pain therapies—venturing away from traditional opioid combinations to meet regulatory standards and address public health concerns.


References
[1] U.S. Food and Drug Administration. (2010). "FDA Orders Contraindicated Use of Propoxyphene." Available at: [FDA website link].

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