American Regent v. Amneal: Multrys® Patent Infringement Resolved by Consent Judgment
American Regent, Inc. sued Amneal Pharmaceuticals over five patents protecting Multrys® (trace elements injection 4*, USP) in 1 mL single-dose vials. The New Jersey District Court case closed in just 36 days via a consent judgment that enjoins Amneal from infringing the asserted patents unless specifically authorized under the parties’ settlement agreement.
Rapid ANDA settlement injects an injunction into Amneal’s generic path
American Regent, Inc. (ARI) filed suit against Amneal Pharmaceuticals of New York, LLC and Amneal EU, Limited in the District of New Jersey on 26 June 2025, asserting five patents — US11786548B2, US11975022B2, US11998565B2, US12150956B2 and US12150957B2 — covering its Multrys® (trace elements injection 4*, USP) product. Amneal had filed Abbreviated New Drug Application No. 219027 seeking FDA approval for a generic trace elements injection (1000 mcg Zn/mL, 60 mcg Cu/mL, 3 mcg Mn/mL and 6 mcg Se/mL in 1 mL single-dose vials), triggering the Hatch-Waxman litigation.
The case closed on 1 August 2025 — just 36 days after filing — through a court-entered consent judgment. The judgment enjoins Amneal and its affiliates from making, using, selling, offering to sell, importing or distributing the ANDA products in the United States unless specifically authorised by ARI or by 35 U.S.C. § 271(e)(1). All claims, counterclaims and affirmative defenses were dismissed without prejudice and without costs. The court retained jurisdiction to enforce the consent judgment and the underlying settlement agreement.
The 36-day resolution is strikingly fast for ANDA litigation, which typically extends years through claim construction and trial. The consent judgment’s explicit injunction — rather than a simple dismissal — suggests the parties reached a negotiated commercial arrangement, likely a licensed market entry date, the financial terms of which are not disclosed in the public record. The FDA retains authority to grant final ANDA approval, and Amneal may continue to maintain or file Paragraph IV certifications, signalling that a future licensed entry date has been agreed rather than a permanent bar.
Filing to Consent Judgment in 36 days
36-day resolution — well below the median ANDA patent litigation timeline of several years
Consent judgment with injunction: what the settlement means for both parties
Consent judgment is not a merits ruling — it is a binding court order by agreement
A consent judgment combines a negotiated settlement with judicial enforcement. The court entered a formal order enjoining Amneal without adjudicating patent validity or infringement on the merits. Dismissal without prejudice means neither side is collaterally estopped from future litigation, but the injunction itself is immediately enforceable and survives the case’s closure. The court retains jurisdiction to police compliance.
Enforceable injunction enteredNo prejudice finding: what the public record does — and does not — tell us
Dismissal without prejudice preserves both parties’ rights to re-litigate if the settlement agreement is breached or a licensing dispute arises. Unlike a dismissal with prejudice, ARI could theoretically refile on the same patents if Amneal were to act outside the settlement’s authorised scope. The financial terms of the settlement — including any licensed entry date — are not publicly disclosed and cannot be inferred from the consent judgment alone.
No merits adjudicationARI secures injunction across all five patents and retains enforcement rights
The consent judgment confirms that all five Licensed ARI Patents remain in force and enforceable against Amneal without any validity concession. ARI retains the unilateral right to authorise market entry under the settlement agreement, and compliance can be enforced directly by ARI or its successors. This outcome is broadly favourable for the patent holder, preserving both the IP estate and commercial control over Multrys®.
IP estate intactAmneal’s ANDA survives — but launch is subject to ARI’s authorisation
Amneal’s ANDA No. 219027 is not withdrawn. The FDA may still grant final approval, and Amneal retains the right to maintain or file Paragraph IV certifications. This strongly suggests a negotiated future launch date rather than a permanent exclusion. Amneal avoided an adverse merits ruling on patent validity, preserving litigation optionality — but is enjoined from launching without ARI’s sign-off until the settlement’s conditions are met.
Conditional future entry preservedFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | American Regent, Inc. | Company | Pharmaceutical manufacturer — holder of US11786548B2 and four related Multrys® patentsSearch in Eureka ↗ |
| Defendant | Amneal Pharmaceuticals, Inc. | Company | Generic pharmaceutical company seeking FDA approval via ANDA No. 219027 for trace elements injectionSearch in Eureka ↗ |
| Plaintiff counsel | Charles H. Chevalier | Attorney | Counsel for American Regent, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Christine A. Gaddis | Attorney | Counsel for American Regent, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Gibbons PC | Law Firm | Representing American Regent, Inc.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | New Jersey District CourtSearch in Eureka ↗ |
Official order — verbatim text
The consent judgment’s operative language — enjoining Amneal from any commercialisation of ANDA No. 219027 products ‘unless otherwise specifically authorized by ARI’ — signals that the real substance of the resolution lies in the non-public settlement agreement, which governs the scope and timing of any licensed entry. The dismissal without prejudice and the explicit FDA carve-out in paragraph 7 are characteristic of a negotiated entry-date settlement rather than a capitulation, and no patent was adjudicated invalid or not infringed.
US11786548B2 and four related patents — Multrys® trace elements injection formulations
The five asserted patents — US11786548B2, US11975022B2, US11998565B2, US12150956B2 and US12150957B2 — collectively cover formulations and methods relating to ARI’s Multrys® product, a four-element trace elements injection (zinc, copper, manganese, selenium) indicated for parenteral nutrition. The application numbers span filing dates from US17/365695 through US18/672876, consistent with an active continuation prosecution strategy building a layered patent estate around a single commercial product.
Multrys® holds a significant position in the parenteral nutrition market as an FDA-approved trace elements injection meeting updated nutritional guidelines. A five-patent assertion strategy against a single ANDA makes invalidity challenges disproportionately expensive for generic filers, and the rapid settlement suggests Amneal assessed the litigation cost-benefit as unfavourable to a full contest. For competitors developing trace element injectable products, this portfolio signals meaningful freedom-to-operate risk that extends well beyond any single claim.
Should your product team run an FTO against ARI’s Multrys® patent family?
Any company developing, manufacturing or seeking ANDA approval for a trace elements injection product containing zinc, copper, manganese and selenium in single-dose vials should treat this five-patent family as a priority FTO target. The consent judgment confirms all five patents are active and enforceable. Given ARI’s continuation filing activity across application numbers US17/365695 to US18/672876, additional patents from this family may issue — meaning an FTO conducted today could be incomplete within 12–18 months.
PatSnap Eureka’s FTO Search Agent can map your formulation parameters against all five asserted patents and their prosecution histories simultaneously, flag continuation applications still pending at the USPTO, and identify claim elements most likely to capture competing trace element injectable formulations. Running a structured FTO now — before FDA submission — substantially reduces the risk of a consent judgment scenario that forecloses a commercial launch.
Run a freedom-to-operate analysis on US12150956B2 to assess your product’s exposure
Run FTO in Eureka →Similar ANDA patent infringement cases: trace elements and parenteral nutrition injectables
Explore comparable Hatch-Waxman ANDA patent infringement cases involving parenteral nutrition and specialty injectable formulations in New Jersey District Court.
Related patent case — similar technology
Comparable case in the same technology domain. Patent holder and defendant reached resolution after proceedings.
SettledRelated infringement action — same court
Comparable ARI’s Multrys® (trace elements injection 4*, USP) in 1 mL single-dose vials drug product-adjacent infringement action. Patent enforcement dynamics analysed in depth.
Active · District CourtRelated invalidity challenge — appellate outcome
Combined invalidity and infringement action in the same technology space. Decided after substantive proceedings.
DecidedAmerican Regent, Inc.’s broader IP enforcement history
American Regent, Inc.’s full litigation history covering prior enforcement, licensing activity, and inter partes review proceedings.
Portfolio viewWhat this case signals for the parenteral nutrition and ANDA patent IP landscape
A 36-day consent judgment with injunction in an ANDA case is a rare and instructive outcome for pharmaceutical IP teams.
Early ANDA settlements with injunctions are increasingly preferred by branded firms
By securing a court-entered injunction rather than relying solely on contractual terms, ARI ensured that any breach by Amneal exposes it to contempt proceedings — a stronger enforcement posture than a private settlement alone. IP teams protecting specialty injectables should consider whether consent judgments offer better enforcement leverage than pure settlement agreements.
Five-patent portfolios around specialty injectables raise the ANDA litigation cost calculus
ARI’s assertion of five overlapping patents covering Multrys® formulations illustrates a layered prosecution strategy that makes invalidity challenges more costly for generic filers. R&D and IP teams developing competing trace element injectable products should conduct FTO assessments against the entire ARI patent family, not just the earliest-filed patent.
Paragraph IV certification preserved: Amneal’s licensed entry date is the key commercial variable
The consent judgment’s explicit carve-out preserving Amneal’s right to maintain Paragraph IV certifications strongly suggests a negotiated market entry date exists within the settlement agreement. Competitors and investors should monitor FDA ANDA approval notices for ANDA No. 219027 as a proxy for when that licensed entry date may trigger.
ARI’s patent filing dates suggest continued prosecution activity — watch for continuations
With application numbers spanning US17/365695 through US18/672876, ARI’s portfolio shows active continuation filing. Additional continuation patents may emerge from this family, potentially extending the exclusivity window for Multrys® beyond the current five asserted patents. Generic entrants and biosimilar developers should monitor the prosecution history of these application families.
American v Amneal — key questions answered
American Regent asserted five patents: US11786548B2, US11975022B2, US11998565B2, US12150956B2 and US12150957B2, all covering its Multrys® (trace elements injection 4*, USP) product in 1 mL single-dose vials. The case also consolidated with related action 2:25-cv-02642-BRM-CLW.
The consent judgment enjoins Amneal from making, selling or distributing its ANDA No. 219027 products in the US without ARI’s authorisation. However, the FDA may still grant ANDA approval and Amneal may maintain Paragraph IV certifications, strongly suggesting a negotiated licensed market entry date exists within the non-public settlement agreement.
All claims, counterclaims and affirmative defenses were dismissed without prejudice and without costs to any party, per paragraph 6 of the consent judgment filed 1 August 2025. No patent was adjudicated valid, invalid, infringed or not infringed on the merits.
The 36-day resolution is consistent with parties reaching a pre-litigation commercial agreement before substantive motion practice or claim construction. In Hatch-Waxman cases, early settlements typically reflect a negotiated generic entry date. The public record does not disclose the financial terms or the specific licensed entry date agreed between ARI and Amneal.
ANDA No. 219027 covers Amneal’s generic version of Multrys®: Trace Elements Injection 4* USP containing 1000 mcg Zn/mL, 60 mcg Cu/mL, 3 mcg Mn/mL and 6 mcg Se/mL in 1 mL single-dose vials, as defined in paragraph 2 of the consent judgment.
Track ANDA patent risk before your next FDA submission
PatSnap Eureka maps active patent estates like ARI’s five-patent Multrys® portfolio against your pipeline formulations, flags continuation risk, and monitors new ANDA filings in your therapeutic area. Start your FTO before the litigation clock starts.
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