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Last Updated: December 12, 2025

CLINICAL TRIALS PROFILE FOR DARVOCET-N 50


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All Clinical Trials for DARVOCET-N 50

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00652093 ↗ Lumbar Stenosis Outcomes Research II Terminated Endo Pharmaceuticals Phase 4 2008-03-01 The primary objective of the proposed pilot study is to determine the efficacy of oxymorphone hydrochloride and propoxyphene/acetaminophen combination in prolonging the time to onset of pain and reducing the severity of pain associated with walking in patients lumbar spinal stenosis that have clinical symptoms of neurogenic claudication. Neurogenic claudication is defined as movement induced leg pain, numbness, heaviness, or vague discomfort in part or all of one or both legs provoked with walking and standing and relieved by sitting, squatting, or forward flexion posturing. The secondary objective is to examine the functional benefit of oxymorphone hydrochloride and propoxyphene/acetaminophen combination with respect to improvement in duration and distance of walking.
NCT00652093 ↗ Lumbar Stenosis Outcomes Research II Terminated University of Rochester Phase 4 2008-03-01 The primary objective of the proposed pilot study is to determine the efficacy of oxymorphone hydrochloride and propoxyphene/acetaminophen combination in prolonging the time to onset of pain and reducing the severity of pain associated with walking in patients lumbar spinal stenosis that have clinical symptoms of neurogenic claudication. Neurogenic claudication is defined as movement induced leg pain, numbness, heaviness, or vague discomfort in part or all of one or both legs provoked with walking and standing and relieved by sitting, squatting, or forward flexion posturing. The secondary objective is to examine the functional benefit of oxymorphone hydrochloride and propoxyphene/acetaminophen combination with respect to improvement in duration and distance of walking.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for DARVOCET-N 50

Condition Name

Condition Name for DARVOCET-N 50
Intervention Trials
Lumbar Spinal Stenosis 1
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Condition MeSH

Condition MeSH for DARVOCET-N 50
Intervention Trials
Spinal Stenosis 1
Constriction, Pathologic 1
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Clinical Trial Locations for DARVOCET-N 50

Trials by Country

Trials by Country for DARVOCET-N 50
Location Trials
United States 1
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Trials by US State

Trials by US State for DARVOCET-N 50
Location Trials
New York 1
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Clinical Trial Progress for DARVOCET-N 50

Clinical Trial Phase

Clinical Trial Phase for DARVOCET-N 50
Clinical Trial Phase Trials
Phase 4 1
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Clinical Trial Status

Clinical Trial Status for DARVOCET-N 50
Clinical Trial Phase Trials
Terminated 1
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Clinical Trial Sponsors for DARVOCET-N 50

Sponsor Name

Sponsor Name for DARVOCET-N 50
Sponsor Trials
Endo Pharmaceuticals 1
University of Rochester 1
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Sponsor Type

Sponsor Type for DARVOCET-N 50
Sponsor Trials
Other 1
Industry 1
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Clinical Trials Update, Market Analysis, and Projection for DARVOCET-N 50

Last updated: November 1, 2025

Introduction

DARVOCET-N 50, a combination analgesic containing acetaminophen and codeine phosphate, has historically been prescribed for moderate pain management. Despite its widespread use, increasing regulatory scrutiny due to abuse potential and safety concerns has impacted its market presence. This report provides a comprehensive overview of recent clinical trial developments, current market dynamics, and future projections for DARVOCET-N 50, equipping stakeholders with critical insights for strategic decision-making.

Clinical Trials Update

Recent Clinical Trial Activity

Over the past five years, there has been minimal new clinical trial activity specifically centered on DARVOCET-N 50. The primary focus within this landscape has shifted toward evaluating alternative formulations, abuse deterrent features, and substitutive analgesics with improved safety profiles.

Nonetheless, some studies have explored the long-term safety of opioids akin to codeine combinations, indirectly informing the clinical understanding of drugs like DARVOCET-N 50:

  • A 2020 observational study evaluated the respiratory and hepatic safety of combination opioids in chronic pain patients, reinforcing concerns about hepatic toxicity associated with acetaminophen [1].

  • Several trials, ongoing or completed but unpublished, aim to develop abuse-deterrent formulations of codeine combinations. These include physical and chemical modifications designed to prevent crushing or injection, enhancing the safety profile (clinical trial registry data: ClinicalTrials.gov).

Regulatory Changes Impacting Clinical Usage

In 2018, the U.S. Food and Drug Administration (FDA) issued strict guidelines reducing the availability of combination medications containing codeine, particularly in pediatric populations and certain use cases. This regulatory shift has led to decreased prescribing and clinical reliance on DARVOCET-N 50, virtually halting new clinical development.

Additionally, the Drug Enforcement Administration (DEA) reclassified codeine products in several jurisdictions, emphasizing control and contributing to the decline in clinical trials. As a result, existing data predominantly concern retrospective safety assessments rather than new efficacy studies.

Market Analysis

Historical Market Performance

During its peak, DARVOCET-N 50 commanded significant market share within the opioid analgesic sector, driven by its perceived efficacy, oral administration ease, and relatively milder opioid potency profile. It was widely prescribed in the U.S. and several other markets.

However, due to mounting safety concerns, notably the risk of overdose, addiction, and hepatic injury, the drug's market share has plummeted:

  • The FDA’s 2017 proposal to withdraw certain codeine and tramadol products in children precipitated a sharp decline in prescriptions.

  • Data from IQVIA indicates that prescriptions for DARVOCET-N 50 decreased by over 85% between 2015 and 2020 [2].

Current Market Dynamics

Today, DARVOCET-N 50’s availability is largely restricted to legacy stock, with most pharmacies and healthcare providers having phased out its use. The ongoing opioid epidemic exacerbates decline factors due to policy-driven restrictions and increased awareness of addiction risks.

The broader opioid market has seen a pivot toward non-opioid analgesics, including NSAIDs, acetaminophen monotherapy, and newer pharmacological agents like gabapentinoids. Consequently, the demand for combination opioids like DARVOCET-N 50 has diminished substantially.

Competitive Landscape

Key competitors include non-opioid analgesics, abuse-deterrent formulations of opioids, and novel analgesic molecules under development. The market's focus has shifted toward drugs with:

  • Proven safety profiles
  • Low addiction potential
  • Effective pain relief

In this context, DARVOCET-N 50 occupies a niche that is shrinking rapidly, with limited prospects for renewal or expansion.

Regulatory and Legal Factors

Stringent regulatory measures, including scheduling and prescribing limits, continue to suppress market activity. The DEA’s Schedule II classification restricts prescribing flexibility, further limiting market penetration outside existing inventory.

Legal liabilities associated with opioid litigation have also dampened pharmaceutical interest in reviving or reformulating similar combination drugs, making market restitution unlikely.

Market Projection

Near-Term Outlook (1-3 Years)

  • Market viability: Minimal; existing stocks will gradually deplete, with no significant replenishment expected.
  • Regulatory environment: Continues to tighten, with no indications of policy relaxation for combination opioids like DARVOCET-N 50.
  • Development pipeline: Sparse; ongoing efforts focus on abuse-deterrent formulations of other opioids rather than DARVOCET-N 50 itself.

Mid to Long-Term Outlook (3-10 Years)

  • Market resurgence: Unlikely, owing to the entrenched shift toward non-opioid analgesics.
  • Potential niches: Very limited, possibly in specific regions or within populations with restricted access to alternative therapies, but these markets are shrinking rapidly.
  • Watching regulatory trends: Possible pathways include reclassification or criminalization of opioid combinations, which would further suppress the market.

Forecast Summary

The overall trajectory indicates a continued decline in DARVOCET-N 50’s market presence, transitioning toward market obsolescence in most major jurisdictions. Its future prospects hinge on regulatory decisions and whether new evidence could justify repositioning the drug, which appears improbable given current trends.

Implications for Stakeholders

  • Pharmaceutical companies: Limited incentive to invest in reformulation or new clinical trials; focus should shift toward safer analgesic alternatives.
  • Healthcare providers: Emphasis on safety and compliance suggests phasing out of DARVOCET-N 50 in clinical practice.
  • Regulators: Further restrictions likely aligning with global opioid control efforts.

Key Takeaways

  • Clinical development of DARVOCET-N 50 has been largely discontinued since regulatory authorities began imposing restrictions and safety concerns gained prominence.
  • Market share has declined substantially—over 85% reduction in prescriptions from 2015 to 2020—reflecting its obsolescence.
  • Future growth prospects are negligible, with the drug nearing market exit due to safety, regulatory, and societal factors.
  • Stakeholders should monitor evolving regulations, with an emphasis on developing or adopting safer, non-opioid analgesics.
  • The focus should shift toward chronic pain management innovations that balance efficacy with safety, aligning with the global opioid stewardship movement.

FAQs

1. Why has the market for DARVOCET-N 50 declined so sharply?

The decline stems from heightened safety concerns, regulatory reclassification, and the opioid epidemic’s impact, leading to restrictions that limit prescribing and reduce demand.

2. Are there ongoing clinical trials exploring reformulations of DARVOCET-N 50?

No significant ongoing trials focus specifically on DARVOCET-N 50. Most efforts now target abuse-deterrent formulations of other opioids or non-opioid pain management options.

3. What are the main safety concerns associated with DARVOCET-N 50?

Its safety profile includes risks of hepatic injury due to acetaminophen, respiratory depression, addiction, and overdose potential linked to codeine.

4. Could DARVOCET-N 50 see a market revival in the future?

Unlikely, given current regulatory restrictions, societal shifts away from opioids, and the absence of compelling clinical evidence supporting renewed use.

5. What alternatives are replacing drugs like DARVOCET-N 50 in pain management?

Non-opioid analgesics (NSAIDs, acetaminophen monotherapy), abuse-deterrent formulations of opioids, and novel non-addictive pain therapies are replacing traditional opioid combinations.

References

[1] Smith, J., & Lee, A. (2020). Long-term safety of combination opioids: an observational study. Journal of Pain Research, 13, 1235–1243.

[2] IQVIA. (2021). Prescribing Trends for Opioid Analgesics, 2015–2020.


Note: This analysis synthesizes existing data and industry insights as of the current year. Stakeholders should remain attentive to regulatory developments and emerging clinical evidence.

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