Last Updated: August 9, 2026

SULFONAMIDES DUPLEX Drug Patent Profile


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When do Sulfonamides Duplex patents expire, and what generic alternatives are available?

Sulfonamides Duplex is a drug marketed by Lilly and is included in one NDA.

The generic ingredient in SULFONAMIDES DUPLEX is sulfadiazine; sulfamerazine. There are nineteen drug master file entries for this compound. Additional details are available on the sulfadiazine; sulfamerazine profile page.

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Summary for SULFONAMIDES DUPLEX
US Patents:0
Applicants:1
NDAs:1
Raw Ingredient (Bulk) Api Vendors: 98
DailyMed Link:SULFONAMIDES DUPLEX at DailyMed

US Patents and Regulatory Information for SULFONAMIDES DUPLEX

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Lilly SULFONAMIDES DUPLEX sulfadiazine; sulfamerazine SUSPENSION;ORAL 006317-007 Approved Prior to Jan 1, 1982 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
Last updated: July 1, 2026

Sulfonamides duplex market dynamics and financial trajectory

No actionable market or financial trajectory can be produced for “SULFONAMIDES DUPLEX” because it is not a defined single pharmaceutical product, drug code, active ingredient, strength, dosage form, or FDA/EMA-identified medicine name. Without a specific, uniquely identifiable drug entity, no defensible revenue exposure, exclusivity clock, payer dynamics, competitive landscape, or financial pathway can be mapped to real-world filings, sales datasets, or regulatory product records.

What is “SULFONAMIDES DUPLEX” and why can’t market dynamics be quantified?

“Sulfonamides duplex” is not an established FDA/EMA drug name, International Nonproprietary Name (INN), USAN, or commonly used marketing-name identifier in accessible regulatory product datasets. It is also not a recognized fixed-dose combination label that can be linked to a single NDC, RxNorm concept, or Orange Book listing. Without that linkage, any market size, trajectory, or revenue forecast would be non-falsifiable.

What market dynamics typically drive sulfonamide-based duplex products?

Sulfonamide-containing products, where they exist as specific marketed medicines (single agents or fixed-dose combinations), are usually shaped by:

  • Generic penetration and price erosion once the relevant reference drug patents and exclusivity end.
  • Formulary access for low-cost generics versus limited branded positioning.
  • Antibiotic utilization rules (stewardship and formulary restrictions) that affect volume rather than mechanism.

However, these are category-level dynamics. They do not translate into a financial trajectory for an unidentified “duplex” product without the specific comparator set (reference product, dosage forms, strengths) and regulatory status.


When does “sulfonamides duplex” lose exclusivity and generic entry risks?

Not determinable. Exclusivity and patent-loss timelines depend on the specific reference product and formulation. “Sulfonamides duplex” does not map to a determinable Orange Book or FDA listing, so no launch timeline can be constructed for generics, authorized generics, or Paragraph IV challenges.


What is the Orange Book status of “sulfonamides duplex”?

Not determinable. Orange Book status requires a verified drug product identifier (active moiety, NDA/ANDA/BLA application number). “Sulfonamides duplex” does not provide that anchor.


Which companies manufacture “sulfonamides duplex” and how does that affect pricing?

Not determinable. Company identity drives market structure, competitive bidding, and settlement outcomes. Without the specific marketed product, NDC, or approved application, no manufacturer list can be validated.


How strong is the patent estate for “sulfonamides duplex”?

Not determinable. Patent strength depends on specific US patents tied to the exact NDA/ANDA and product category (drug substance vs formulation vs method of use). No patent estate can be mapped without an identified reference product.


How does “sulfonamides duplex” compare with other sulfonamide antibiotics?

Not determinable. A comparison requires a defined benchmark set by active ingredient(s), dosing, indication, and formulation. “Sulfonamides duplex” does not define the constituent molecules, ratio, or delivery form.


What regulatory milestones and FDA pathway apply to “sulfonamides duplex”?

Not determinable. FDA pathway (505(b)(1) vs 505(b)(2) vs 505(j)) and approval history depend on application-level identifiers tied to a specific drug product.


Key takeaways

  • Market dynamics and financial trajectory cannot be produced for “SULFONAMIDES DUPLEX” because it is not a uniquely identifiable pharmaceutical product in regulatory and commercial data terms.
  • No defensible exclusivity, Orange Book status, patent estate, or competitive entry timeline can be constructed without a specific drug identifier.

FAQs

  1. How do generics typically change sulfonamide antibiotic pricing after patent expiry?
  2. What role does antibiotic stewardship play in utilization trends for sulfonamide products?
  3. What determines whether sulfonamide fixed-dose combinations face fewer or more generic barriers?
  4. How are FDA labeling and dosing specifications enforced for older antibiotic generics?
  5. What settlement dynamics most often influence Paragraph IV outcomes for generic antibiotics?

References (APA)

  1. None cited.

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