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Last Updated: December 12, 2025

AZULFIDINE EN-TABS Drug Patent Profile


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Which patents cover Azulfidine En-tabs, and what generic alternatives are available?

Azulfidine En-tabs is a drug marketed by Pfizer and is included in one NDA.

The generic ingredient in AZULFIDINE EN-TABS is sulfasalazine. There are ten drug master file entries for this compound. Ten suppliers are listed for this compound. Additional details are available on the sulfasalazine profile page.

DrugPatentWatch® Litigation and Generic Entry Outlook for Azulfidine En-tabs

A generic version of AZULFIDINE EN-TABS was approved as sulfasalazine by WATSON LABS on December 31st, 1969.

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Drug patent expirations by year for AZULFIDINE EN-TABS
Recent Clinical Trials for AZULFIDINE EN-TABS

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

SponsorPhase
University of Erlangen-Nürnberg Medical SchoolPhase 3
Brigham and Women's HospitalPhase 4
Columbia UniversityPhase 4

See all AZULFIDINE EN-TABS clinical trials

Pharmacology for AZULFIDINE EN-TABS
Drug ClassAminosalicylate

US Patents and Regulatory Information for AZULFIDINE EN-TABS

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Pfizer AZULFIDINE EN-TABS sulfasalazine TABLET, DELAYED RELEASE;ORAL 007073-002 Apr 6, 1983 AB RX Yes Yes ⤷  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 AZULFIDINE EN-TABS

Last updated: August 1, 2025


Introduction

AZULFIDINE EN-TABS, a formulation of sulfonamide antibiotics, is recognized for its therapeutic applications in bacterial infections, particularly in ophthalmology, dermatology, and certain gastrointestinal conditions. Gaining insights into its market dynamics and financial trajectory is crucial for stakeholders including pharmaceutical companies, investors, and healthcare providers. This analysis explores the factors shaping AZULFIDINE EN-TABS’s market evolution, competitive positioning, revenue potential, and future growth prospects.


Market Overview

AZULFIDINE EN-TABS, primarily containing sulfadiazine, is a long-standing antimicrobial agent with established efficacy against susceptible bacterial strains. Its role in managing ocular infections is significant, especially in treating bacterial conjunctivitis and keratitis, owing to its topical and systemic formulations. The global antibiotic market, projected to reach USD 50 billion by 2027 (IQVIA), provides a substantial backdrop for evaluating AZULFIDINE’s standing amid growing concerns about antibiotic resistance and regulatory shifts.


Market Drivers

1. Rising Incidence of Bacterial Infections:
The prevalence of bacterial conjunctivitis and ocular surface infections warrants sustained demand for effective antimicrobial agents like AZULFIDINE EN-TABS. Globally, the increase in immunocompromised populations and aging demographics amplifies infection rates.

2. Established Clinical Efficacy and Safety Profile:
AZULFIDINE EN-TABS has a well-characterized safety profile, encouraging continued use in both developed and emerging markets. Its longstanding clinical track record reduces barriers to adoption among ophthalmologists and general practitioners.

3. Increasing Awareness and Diagnostic Capabilities:
Enhanced diagnostic infrastructure accelerates appropriate antibiotic prescriptions, bolstering the drug's usage. Educational campaigns about antibiotic stewardship also influence prescribing patterns favorably.

4. Strategic Formulations and Patent Expirations:
While original formulations face generic competition post-patent expiry, companies innovating with combination therapies and novel delivery mechanisms can sustain market share.


Market Challenges

1. Antibiotic Resistance:
The rising prevalence of resistant strains reduces AZULFIDINE EN-TABS’s effectiveness, prompting clinicians to overlook certain antibiotics. Resistance to sulfadiazine is documented, which may limit its utility in certain contexts.

2. Regulatory and Environmental Scrutiny:
Antibiotic use is increasingly scrutinized due to environmental concerns about resistance gene dissemination and stewardship policies, potentially constraining market growth.

3. Competition from Alternatives:
Newer antibiotics with broader spectra and fewer resistance issues, like fluoroquinolones, are gaining favor, challenging AZULFIDINE EN-TABS’s market share.

4. Market Saturation in Developed Countries:
Mature markets exhibit limited growth due to high penetration, necessitating strategic focus on emerging markets for expansion.


Market Dynamics

Competitive Landscape:
Major players include pharmaceutical giants through generic suppliers, notably in India, China, and Southeast Asia. The commoditization of sulfadiazine compounds increases price competition but limits innovation-driven differentiation. The entry of bioequivalent generics has driven prices downward, pressuring revenue margins.

Regulatory Environment:
Globally, drug registration varies; emerging markets often experience shorter approval timelines, offering growth prospects. Conversely, stringent regulatory environments in the U.S. and EU could delay or restrict newly formulated or combination products.

Distribution and Supply Chain:
Distribution networks in emerging markets—aiming for broader reach—significantly influence sales volume. Supply chain resilience, particularly amid geopolitical uncertainties and pandemic disruptions, directly impacts revenue.

Emerging Opportunities:
Innovating delivery methods—such as sustained-release formulations or combination therapies—may extend product life cycles. Development of targeted ophthalmic formulations is also gaining prominence, aligning with user preferences for local administration.


Financial Trajectory

Revenue Projections:
Global antibiotic sales are anticipated to grow modestly at a compounded annual growth rate (CAGR) of 2-3% from 2022 to 2027 (IQVIA). Given AZULFIDINE EN-TABS’s niche positioning, its revenues are expected to mirror this trend, contingent upon market penetration, resistance trends, and regulatory approvals.

Profitability Outlook:
The commoditized nature of the drug implies tight gross margins, especially for generic formulations. Profitability hinges on operational efficiencies, patent strategy (if any), and diversification into new formulations or indications.

Market Penetration Strategies:
Focusing on unmet needs—such as resistant infections, pediatric formulations, or combination therapies—could open new revenue streams. Partnerships with regional distributors can reinforce presence in expanding economies.

Risks to Financial Trajectory:
Emerging resistance, regulatory hurdles, and pricing pressures pose significant risks. Moreover, shifts towards alternative therapies may cap market potential if innovation does not keep pace.


Future Outlook and Strategic Recommendations

Innovation and R&D Investment:
Investing in novel formulations—like sustained-release or targeted ophthalmic solutions—could rejuvenate AZULFIDINE EN-TABS’s market appeal and extend its lifecycle. Additionally, combined therapies targeting resistant bacteria may address evolving clinical needs.

Market Expansion:
Prioritizing growth in emerging markets with expanding healthcare infrastructure and higher infection burdens offers revenue opportunities. Strategic alliances and localized manufacturing can reduce costs and foster brand loyalty.

Regulatory Vigilance:
Proactive engagement with regulatory agencies is essential to navigate evolving policies and maintain product approvals, especially for new formulations or indications.

Antibiotic Stewardship:
Aligning lifecycle management with global stewardship initiatives ensures sustainable use, reducing resistance development and preserving market viability.


Key Takeaways

  • Stable yet competitive: AZULFIDINE EN-TABS’s long-standing efficacy makes it a staple for bacterial infections, but its market faces pressure from resistance, generics, and newer antibiotics.
  • Growth opportunities in emerging markets: Expanding presence and formulations tailored to regional needs can drive revenue growth.
  • Innovation is critical: Developing new delivery systems and combination therapies can extend product relevance amid resistance challenges.
  • Regulatory agility: Cross-border compliance, especially in stringent markets, influences sales trajectories.
  • Pricing and margins: Commoditization necessitates operational efficiency to sustain profitability.

FAQs

1. What are the primary therapeutic uses of AZULFIDINE EN-TABS?
AZULFIDINE EN-TABS is predominantly used for bacterial infections, including ocular infections like conjunctivitis, dermatological conditions, and certain gastrointestinal infections, leveraging sulfadiazine’s antimicrobial properties.

2. How does antibiotic resistance impact the market for AZULFIDINE EN-TABS?
Resistance diminishes drug efficacy, leading clinicians to prescribe alternative antibiotics. This trend constrains market growth and necessitates innovation to maintain relevance.

3. What strategies can companies adopt to sustain AZULFIDINE EN-TABS’s market position?
Strategies include developing novel formulations, targeting resistant infections, expanding into emerging markets, and aligning with stewardship policies to ensure responsible use.

4. How does patent expiry influence AZULFIDINE EN-TABS’s market dynamics?
Patent expiry increases generic competition, driving prices down but also requires differentiation through formulations or new indications to sustain revenues.

5. What are the future growth prospects for AZULFIDINE EN-TABS?
Growth prospects depend on successful innovation, market expansion, regulatory navigation, and addressing resistance. Emerging markets represent significant potential.


Sources
[1] IQVIA, “Global Antibiotic Market Report, 2022-2027”
[2] World Health Organization, “Antimicrobial Resistance: Global Report,” 2019

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