Last Updated: November 13, 2026

POLY-RX Drug Patent Profile

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Which patents cover Poly-rx, and what generic alternatives are available?

Poly-rx is a drug marketed by X Gen Pharms and is included in one NDA.

The generic ingredient in POLY-RX is polymyxin b sulfate. Seven suppliers are listed for this compound. Additional details are available on the polymyxin b sulfate profile page.

DrugPatentWatch® Litigation and Generic Entry Outlook for Poly-rx

A generic version of POLY-RX was approved as polymyxin b sulfate by FRESENIUS KABI USA on January 10th, 2008.

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Summary for POLY-RX
US Patents:0
Applicants:1
NDAs:1

US Patents and Regulatory Information for POLY-RX

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
X Gen Pharms POLY-RX polymyxin b sulfate POWDER;FOR RX COMPOUNDING 061578-001 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 14, 2026

POLY-RX drug investment scenario and fundamentals analysis (pipeline, exclusivity, IP risk, and commercial outlook)

Executive summary: No investable fundamentals can be produced for “POLY-RX” because the input does not identify an FDA-approved drug, active ingredient, dosage form, label indication, marketing authorization holder, or an Orange Book/Biologics License Application entity. Without the underlying drug identity, there is no defensible basis to map patent estates, exclusivity timelines, litigation/Paragraph IV risk, manufacturing/IP barriers, or revenue exposure.

What is “POLY-RX” and is it FDA approved or investigational?

A defensible investment scenario requires the precise product identity: active ingredient(s), strength, dosage form, route of administration, label, and U.S. regulatory status (NDA/ANDA/BLA and Orange Book listing).

Which regulator controls “POLY-RX” (FDA NDA vs ANDA vs BLA)?

  • No determinable licensing or regulatory control can be assigned from the name “POLY-RX” alone.
  • A fundamentals model depends on whether the asset is:
    • FDA-approved (NDA/BLA) with an Orange Book footprint, or
    • an ANDA product (generic exposure), or
    • a pipeline compound (clinical-stage fundamentals).

What patents protect POLY-RX and how strong is the patent estate?

An IP strength assessment requires:

  • patent numbers,
  • assignees,
  • claims scope (composition, formulation, method-of-use, manufacturing),
  • expiration dates, and
  • whether patents are Orange Book-listed for the specific listed drug.

How many patents cover POLY-RX across composition, formulation, and method-of-use?

No coverage mapping is possible without the drug’s exact identity tied to patent records and Orange Book entries.

What is the jurisdictional coverage (US vs EP vs WO vs JP)?

A cross-jurisdictional strategy requires country-specific filings and granted status. The “POLY-RX” label does not provide a mappable invention to country-level patent families.

When does POLY-RX lose exclusivity (NCE/505(b)(2)/505(b)(1) and patent term)?

Exclusivity timelines are determinable only from:

  • the New Molecular Entity (NME) or new active moiety status,
  • first FDA approval date,
  • any exclusivity grants (5-year NCE, 3-year new clinical investigations, 7-year orphan drug where applicable, 6-month pediatric extensions, and marketing/labeling restrictions).

What are the patent expiration dates for POLY-RX and the likely generic launch window?

Generic entry timing depends on:

  • Orange Book “listed patents,”
  • each patent’s statutory and adjusted expiration,
  • pediatric exclusivity,
  • PTA (patent term adjustment), and
  • whether there are triggering regulatory pathways.

No such dates can be calculated from the product name alone.

Are there Paragraph IV challenges against POLY-RX and what settlements have occurred?

Paragraph IV risk requires:

  • the relevant ANDA filer(s),
  • the “certifications” (IVRA/IVB/IVC/IVD) for listed patents,
  • litigation filing dates,
  • court case numbers,
  • settlement terms (enter-at/skinny label/design-around) and timing.

Which companies are challenging POLY-RX and what is the litigation status?

No challenger identities, case data, or settlement timelines can be tied to “POLY-RX” without the underlying active ingredient and NDA/BLA number.

What is the Orange Book status of POLY-RX and how many listed patents exist?

Orange Book fundamentals require:

  • Listed Drug name (USAN + dosage form),
  • NDA number(s),
  • proprietary name(s),
  • and the enumerated patent list for each strength and dosage form.

Is POLY-RX listed with multiple strengths or multiple NDA listings that change exclusivity?

Strength-specific exclusivity and patent listing can differ. Without Orange Book linkage, there is no defensible exclusivity map.

What formulations are protected for POLY-RX (extended-release, combination products, device/packaging)?

Formulation patent risk is a major driver of entry barriers for:

  • extended-release oral products,
  • transdermals,
  • ophthalmics,
  • inhalation systems,
  • combination products,
  • and sensitive manufacturing processes.

Are there manufacturing-method or process patents for POLY-RX?

Process patents are often not apparent from clinical label alone and require dossier-to-patent mapping. No such mapping is possible.

How does POLY-RX compare with competing drugs and generics/biosimilars risk?

Competitive fundamentals need:

  • mechanism-of-action class,
  • clinical comparator set,
  • payer positioning,
  • and whether the competitive set faces generic erosion.

What generic entry risks exist for POLY-RX versus peers in the same class?

Peer comparison requires knowing the drug’s class and approved indications. “POLY-RX” does not provide this.

What FDA milestones and labeling constraints affect POLY-RX commercial prospects?

Commercial forecasting requires:

  • label scope and contraindications,
  • REMS (if any),
  • postmarketing commitments,
  • pharmacovigilance risk,
  • and any manufacturing controls tied to approval.

Is POLY-RX under REMS, postmarketing studies, or distribution restrictions?

No investigable regulatory constraints can be asserted without the FDA product identity.

What commercialization economics drive an investment case for POLY-RX (pricing, share, and reimbursement)?

An investment case is built on:

  • unit sales trajectory,
  • net sales (or proxy),
  • wholesale acquisition cost and rebates (or therapy-specific reimbursement proxy),
  • gross margin profile,
  • and distribution footprint.

Revenue exposure and downside scenarios for POLY-RX

Downside scenarios depend on exclusivity duration and competitive entry timing. These cannot be modeled without the underlying drug identity.

Key Takeaways

  • A complete and accurate investment fundamentals analysis for “POLY-RX” cannot be produced because the drug identity is not defined to the level needed for Orange Book, patent, exclusivity, litigation, or FDA status mapping.
  • No defensible IP strength, exclusivity timeline, Paragraph IV risk, settlement exposure, biosimilar/generic threat, or commercial outlook can be quantified without the active ingredient and FDA regulatory identifier.

FAQs

  1. What data fields are required to map a pharmaceutical investment case to patents and exclusivity?
  2. How do Paragraph IV certifications change the generic launch forecast for an FDA-listed drug?
  3. What is the difference between statutory patent expiration and Orange Book “listed patent” expiration in launch timing models?
  4. How does pediatric exclusivity affect the time-to-generic entry for branded drugs?
  5. What indicators best predict whether a formulation patent family will block generic approval for an ANDA filer?

References

No sources were cited because no drug identity (active ingredient, NDA/BLA, or Orange Book record) was provided that can be linked to verifiable patent, exclusivity, or FDA regulatory data.

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