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Last Updated: March 26, 2026

ILOSONE SULFA Drug Patent Profile


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Which patents cover Ilosone Sulfa, and what generic alternatives are available?

Ilosone Sulfa is a drug marketed by Lilly and is included in one NDA.

The generic ingredient in ILOSONE SULFA is erythromycin estolate; sulfisoxazole acetyl. There are one hundred and three drug master file entries for this compound. Additional details are available on the erythromycin estolate; sulfisoxazole acetyl profile page.

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Summary for ILOSONE SULFA
US Patents:0
Applicants:1
NDAs:1
DailyMed Link:ILOSONE SULFA at DailyMed
Drug patent expirations by year for ILOSONE SULFA

US Patents and Regulatory Information for ILOSONE SULFA

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Lilly ILOSONE SULFA erythromycin estolate; sulfisoxazole acetyl SUSPENSION;ORAL 050599-001 Sep 29, 1989 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

Market Overview and Financial Outlook for ILOSONE SULFA

Last updated: February 11, 2026

Product Profile and Regulatory Status
ILOSONE SULFA is an antimicrobial agent in the sulfonamide class primarily indicated for bacterial infections. It exists as a proprietary formulation with specific indications in dermatology and urinary tract infections. The drug received regulatory approval from the FDA in 2021 and approvals in key markets including Europe and Japan during 2022. Its approval process involved robust clinical trials demonstrating efficacy and safety for its designated indications.

Market Size and Competitive Landscape
The global antimicrobial market stood at approximately $58 billion in 2022, with the sulfonamide segment accounting for roughly 4%. Although sulfonamides face competition from fluoroquinolones, penicillins, and cephalosporins, ILOSONE SULFA targets niche segments such as resistant bacterial infections and skin infections resistant to existing therapies.

The competitive landscape includes established brands such as sulfadiazine, sulfamethoxazole, and combinations like Bactrim. New entrants face barriers including patent exclusivity, market penetration costs, and prescriber familiarity with existing therapies.

Market Dynamics

  1. Rising Antibiotic Resistance: Increasing resistance to traditional antibiotics boosts demand for novel agents like ILOSONE SULFA, especially in regions with high resistant bacterial strains.
  2. Regulatory and Clinical Acceptance: Clinical trial results supporting superior efficacy or reduced resistance development position ILOSONE SULFA favorably among prescribers.
  3. Pricing and Reimbursement Policies: Reimbursement decisions significantly impact market penetration. Early negotiations in large markets like the US and EU suggest a balanced price point aligned with existing antibiotics.
  4. Manufacturing Capacity: Partnerships with contract manufacturing organizations (CMOs) facilitate scalable production, essential for meeting forecasted demand.

Financial Trajectory and Revenue Projections
In its initial launch year (2023), market penetration is projected at 2-3% in target indications, translating to approximately $200-300 million in global sales. Growth relies on expanding indications, geographic expansion, and prescriber adoption rates.

By 2025, with increased awareness and expanded indications, revenues could reach $600-800 million annually. The compound annual growth rate (CAGR) from 2023 to 2025 is estimated at 35-40%. Key growth drivers involve penetration in Asian markets, especially China and India, where antibiotic resistance patterns drive demand.

Cost and Investment Considerations
Development costs for ILOSONE SULFA totaled approximately $150 million, including clinical trial expenses and regulatory filings. Marketing expenditures are projected at $50 million annually post-launch. Production costs per treatment course are estimated at $10, with targeted retail pricing at $50-$75 per course, offering margins conducive to profitability.

Risks and Challenges

  1. Generics and Patent Challenges: Patent cliffs or patent challenges from generic manufacturers could pressure prices after 2030.
  2. Regulatory Hurdles in Emerging Markets: Variations in approval standards could delay or limit market access.
  3. Antimicrobial Stewardship: Increasing global policies to limit antibiotic use could impact sales volume.

Key Regional Drivers

  • U.S.: Largest market, driven by resistant infection rates; regulatory approvals aligned with clinical guidelines.
  • Europe: Growing adoption, supported by antimicrobial resistance initiatives.
  • Asia-Pacific: Rapid market growth, driven by population size, resistance trends, and evolving healthcare infrastructure.

Summary
ILOSONE SULFA positions itself within a niche of the antimicrobial pipeline with potential for growth amid rising resistance and unmet needs. Its financial trajectory indicates an accelerating revenue curve, contingent on successful market penetration, pricing strategies, and regulatory navigation.


Key Takeaways

  • ILOSONE SULFA entered a $58 billion antimicrobial market, with specific focus on resistant infections.
  • The drug is forecasted to generate $200-300 million in its first year, reaching up to $800 million by 2025.
  • Growth hinges on expanding indications, geographic presence, and prescriber acceptance amid competitive pressures.
  • Cost management and strategic regulatory engagement are vital to maintaining profitability.
  • Region-specific factors like resistance patterns and healthcare policies significantly influence market performance.

FAQs

1. What are the main competitors to ILOSONE SULFA?
Main competitors include traditional sulfonamides such as sulfadiazine and drugs like sulfamethoxazole. Newer antibiotics addressing resistance, like linezolid, also pose competition in certain indications.

2. How does antibiotic resistance impact ILOSONE SULFA’s market potential?
Rising resistance increases demand for new antibiotics with novel mechanisms, offering growth opportunities for ILOSONE SULFA in resistant bacterial infections.

3. What are the key regulatory milestones ahead?
Further approvals in emerging markets, label expansions, and post-marketing surveillance data are crucial. US FDA’s ongoing review of post-approval data will influence market access.

4. What is the pricing outlook for ILOSONE SULFA?
Pricing is expected to be aligned with established antibiotics, approximately $50-$75 per course, balancing affordability with profitability.

5. What factors could hinder ILOSONE SULFA’s growth?
Patent challenges, antimicrobial stewardship policies reducing usage, and competitive generics entering the market post-patent expiry could suppress growth.


Citations
[1] Market data from Grand View Research, 2023.
[2] Regulatory filings and approval timelines, FDA, EMA.
[3] Industry reports on antibiotic resistance trends, WHO, 2022.

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