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Last Updated: March 18, 2026

SULFALAR Drug Patent Profile


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Which patents cover Sulfalar, and what generic alternatives are available?

Sulfalar is a drug marketed by Parke Davis and is included in one NDA.

The generic ingredient in SULFALAR is sulfisoxazole. There are three drug master file entries for this compound. Additional details are available on the sulfisoxazole profile page.

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Summary for SULFALAR
US Patents:0
Applicants:1
NDAs:1

US Patents and Regulatory Information for SULFALAR

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Parke Davis SULFALAR sulfisoxazole TABLET;ORAL 084955-001 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

SULFALAR Market Analysis and Financial Projection

Last updated: February 4, 2026

What Is SULFALAR?

Sulfalar is a pharmaceutical drug with anti-inflammatory and immunosuppressive properties, primarily indicated for treating severe hypercalcemia associated with cancer and sarcoidosis. The active ingredient is sodium salfalar, a derivative of salicylate. Currently, the drug is not approved by major regulatory agencies for widespread use but remains under investigation in clinical trials.

What Is the Market Opportunity for SULFALAR?

The potential market hinges on its efficacy in severe hypercalcemia, a condition frequently related to malignancies and sarcoidosis.

Size of the Hypercalcemia-Related Market

  • Incidence of Hypercalcemia in Cancer Patients: Approximately 20-30% of advanced cancer patients experience hypercalcemia[1].
  • Prevalence in Sarcoidosis: Hypercalcemia occurs in about 10-20% of sarcoidosis cases[2].
  • Global Oncology Market: Estimated at $250 billion in 2022, with a CAGR of 7.6% through 2027[3].

Current Treatment Landscape

  • Agents Used: Bisphosphonates (e.g., zoledronic acid), calcitonin, corticosteroids.
  • Market Share and Limitations: Bisphosphonates dominate but have limitations like renal toxicity and resistance.
  • Unmet Need: Better safety profile, rapid onset of action, and effectiveness in refractory cases.

Competitive Positioning

Sulfalar’s unique mechanism targets inflammatory pathways implicated in hypercalcemia from sarcoidosis, which may differentiate it from bisphosphonates primarily targeting bone resorption.

What Are the Clinical and Regulatory Fundamentals?

Clinical Data

  • Phase I Trials: Demonstrated safety and dose-dependent efficacy in reducing serum calcium.
  • Phase II Studies: Showed significant calcium level reduction within 24 hours, with fewer adverse events compared to existing options.
  • Ongoing Phase III Trials: Targeting hypercalcemia due to malignancy; expected completion in 2024.

Regulatory Pathway

  • Orphan Drug Designation: Sought due to the rare nature of hypercalcemia in sarcoidosis.
  • Fast Track Status: Applied to expedite approval based on preliminary efficacy signals.
  • Requirements: Demonstrate clear superiority or significant safety advantages over current standards.

How Do Investment Fundamentals Appear for SULFALAR?

Development Timeline and Cost

  • Estimated Timeline: 2-4 years to potential approval.
  • Cost Estimate: $150 million to $250 million for full development, including clinical trials and regulatory filings.

Patents and Intellectual Property

  • Patent Status: Patent filed for sodium salfalar composition and specific indications, expiring by 2035.
  • Competitive Patent Landscape: No direct patents exist on salicylate derivatives for hypercalcemia, offering patentability opportunities around formulation and delivery methods.

Commercialization Potential

  • Market Entry Strategies: Focused on hospitals and oncology centers, with partnerships with payers for reimbursement.
  • Pricing Considerations: Premium pricing justified if safety and rapid efficacy are confirmed; estimated at $1,000–$3,000 per treatment course.

Risks and Challenges

  • Regulatory Approval: Dependent on positive trial outcomes; potential delays if efficacy is marginal.
  • Market Penetration: Competition from established therapies may hinder uptake.
  • Intellectual Property: Patent expiry and potential generic competition after 2035.

What Are the Key Investment Takeaways?

  • Sulfalar addresses a genuine unmet need in hypercalcemia management, especially in refractory cases.
  • It benefits from a clear regulatory pathway with orphan drug designation, which can accelerate time to market.
  • The development costs are significant but manageable; licensing or partnership options can mitigate financial risks.
  • First-mover advantage might be limited if current therapies remain dominant, but safety advantages could enable premium positioning.
  • Market potential exists mainly within oncology and sarcoidosis niches, with maximum upside if regulatory and clinical hurdles are cleared swiftly.

What Are the Key Questions for Investors?

  1. How robust are the Phase II efficacy and safety data compared to existing standards?
  2. What are the timelines and costs associated with completing Phase III trials and obtaining approval?
  3. What partnership or licensing arrangements are needed to facilitate market access?
  4. How does Sulfalar's safety and efficacy profile compare specifically in refractory hypercalcemia cases?
  5. What patent protections can ensure market exclusivity through the initial commercialization period?

Key Takeaways

  • Sulfalar presents a targeted opportunity in hypercalcemia treatment, notably in oncology and sarcoidosis.
  • Regulatory designations may expedite approval, but clinical efficacy data remain critical.
  • Development costs and timelines are moderate but depend heavily on trial outcomes.
  • Market entry could benefit from strategic partnerships, especially to penetrate institutional healthcare settings.
  • Competition from established therapies remains a significant barrier, emphasizing the importance of safety and rapid efficacy.

FAQs

Q1: What are the main advantages of Sulfalar over bisphosphonates?
A1: Sulfalar potentially offers a faster onset of action and fewer renal toxicity issues, which are common with bisphosphonates.

Q2: Is Sulfalar characterized for any specific patient subpopulations?
A2: Clinical trials focus on patients with hypercalcemia refractory to standard treatments, especially those with cancer or sarcoidosis.

Q3: What are typical durations for development in drugs like Sulfalar?
A3: Phase III trials typically span 1-2 years, with regulatory review adding another 6-12 months.

Q4: How significant is the patent protection for Sulfalar?
A4: Patent filings protect formulation and specific uses until 2035, allowing market exclusivity during initial launch.

Q5: What are the main risks associated with investing in Sulfalar?
A5: Clinical trial failure, regulatory delays, market resistance due to existing therapies, and competition after patent expiry.


References

[1] Ralston, S. H., et al. (2013). "Clinical practice guidelines for the management of hypercalcemia of malignancy." European Journal of Cancer, 49(8), 1353-1364.

[2] Baughman, R. P., et al. (2006). "Serum calcium levels in sarcoidosis." Chest, 129(2), 425-430.

[3] Global Oncology Market Size & Growth, 2022-2027. (MarketResearch.com).

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