Merck v. Lupin: Consent Judgment Blocks Raltegravir Generic Entry (498 Days)
Merck Sharp & Dohme sued Lupin Limited and Lupin Pharmaceuticals in the District of New Jersey, asserting four patents covering raltegravir-based solid pharmaceutical compositions — an HIV integrase inhibitor. The case closed in 498 days with a stipulated consent judgment: Lupin acknowledged infringement and accepted a permanent injunction, blocking its ANDA-backed generic from the U.S. market.
Merck Secures Injunction as Lupin Concedes Raltegravir Infringement
Merck Sharp & Dohme LLC filed suit on January 9, 2023 in the U.S. District Court for the District of New Jersey against Lupin Limited, Lupin Pharmaceuticals, Inc., and Lupin, Inc., asserting infringement of four U.S. patents — Nos. 7,754,731; 8,771,733; 9,649,311; and 10,772,888 — covering solid pharmaceutical compositions containing raltegravir as their sole active ingredient, an HIV integrase inhibitor. The trigger was Lupin’s filing of ANDA No. 217990, seeking FDA approval to market a generic raltegravir product in the United States.
The case closed on May 21, 2024 via a stipulated consent judgment — a negotiated resolution in which Lupin expressly acknowledged that making, using, selling, or importing its ANDA product would infringe the four Licensed Patents. The court entered a permanent injunction barring Lupin and its affiliates, successors, and assigns from any such activity unless specifically authorised by Merck. All claims and counterclaims were dismissed with prejudice, with no costs, disbursements, or attorneys’ fees awarded to either side.
Resolution in 498 days — before any substantive merits ruling — is consistent with Lupin concluding that its ANDA paragraph IV certifications were unlikely to prevail at trial, or that a negotiated outcome (potentially including a confidential licence or entry date) was commercially preferable. The public record does not disclose whether any licensing terms accompany this judgment; the consent judgment reserves FDA’s right to approve the ANDA, suggesting a future authorised-generic or licence arrangement cannot be ruled out from this document alone.
Filing to Consent Judgment in 498 days
498 days — faster than median ANDA patent litigation, which typically runs 2–4 years to trial
Consent judgment entered: what the stipulated infringement ruling means for both parties
Consent judgment: stipulated infringement, not a contested ruling
A consent judgment is a court-entered order reflecting the parties’ own agreement. Here, Lupin expressly stipulated that its ANDA product infringes all four Licensed Patents. Unlike a litigation win at trial, this mechanism means the court made no independent validity or infringement finding — the parties jointly asked the court to enter the order. It carries full judicial force and is immediately enforceable, but Lupin preserved no appellate challenge to the merits.
Stipulated — no merits contestAll claims dismissed with prejudice — Lupin cannot relitigate
Dismissal with prejudice is a final adjudication on the merits. Lupin’s counterclaims — which in ANDA litigation typically include invalidity and non-infringement defences — were also dismissed with prejudice. This means Lupin cannot refile these same claims in a future action. Combined with the permanent injunction, Lupin’s ANDA No. 217990 product is effectively blocked from the U.S. market for the life of the Licensed Patents unless Merck grants authorisation.
No refiling permittedPermanent injunction binds Lupin’s affiliates, successors, and assigns
The injunction extends beyond Lupin Limited and Lupin Pharmaceuticals to all affiliates, successors, and assigns — defined broadly to include entities under common control via 50%+ ownership or board control. This prevents structural workarounds such as transferring the ANDA to a subsidiary or related entity. Merck and its successors retain enforcement rights, meaning any future assignee of the Licensed Patents can directly enforce the injunction.
Broad affiliate coverageFDA approval of ANDA 217990 is explicitly preserved
Notably, the consent judgment states it does not restrict the FDA from approving ANDA No. 217990. This is a standard but commercially significant clause: it leaves open the possibility that Merck could grant Lupin a licence to enter the market at an agreed future date — an authorised-generic arrangement — without further litigation. The public record is silent on whether any such side agreement exists, but the FDA carve-out is typically included precisely to preserve that commercial optionality.
Authorised generic remains possibleFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Merck Sharp & Dohme, LLC | Company | Pharmaceutical innovator — holder of US9649311B2 and three further raltegravir patentsSearch in Eureka ↗ |
| Defendant | Lupin Limited | Individual | Indian generic pharmaceutical manufacturer and U.S. subsidiary seeking ANDA approval for raltegravirSearch in Eureka ↗ |
| Co-Defendant | Lupin Pharmaceuticals, Inc. | Company | Search in Eureka ↗ |
| Co-Defendant | Lupin, Inc. | Company | Search in Eureka ↗ |
| Plaintiff counsel | J. BRUGH LOWER | Attorney | Counsel for Merck Sharp & Dohme, LLCSearch in Eureka ↗ |
| Plaintiff counsel | William P. Deni , Jr. | Attorney | Counsel for Merck Sharp & Dohme, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Gibbons PC | Law Firm | Representing Merck Sharp & Dohme, LLCSearch in Eureka ↗ |
| Defendant counsel | James S. Richter | Attorney | Counsel for Lupin LimitedSearch in Eureka ↗ |
| Defendant law firm | MIDLIGE RICHTER LLC | Law Firm | Representing Lupin LimitedSearch in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | New Jersey District CourtSearch in Eureka ↗ |
Official order — verbatim text
The consent judgment’s explicit stipulation that ‘the making, having made, using, selling, offering to sell or importing of the Lupin Product in the United States infringes the Licensed Patents’ is unusually direct. Rather than a finding of infringement by the court, this is Lupin’s own concession — entered as an adjudication. The broad injunction language and affiliate-binding definitions suggest Merck’s counsel drafted for maximum enforcement reach. Dismissal of all counterclaims with prejudice forecloses any invalidity challenge Lupin had raised or could have raised regarding these four patents.
US9649311B2 & US10772888B2 — Raltegravir HIV Integrase Inhibitor Compositions
US9649311B2 (application US13/503939) and US10772888B2 (application US15/483030) are two of four patents Merck asserted in this action, all directed to solid pharmaceutical compositions containing raltegravir — an HIV-1 integrase strand transfer inhibitor marketed as Isentress. The patents cover formulation and composition claims for the raltegravir active ingredient, protecting not merely the compound itself but its pharmaceutical preparation — a strategically important layer of Hatch-Waxman protection. US10772888B2’s 2020 grant date reflects a later continuation or divisional filing, extending the effective exclusivity timeline.
Raltegravir was among the first integrase inhibitors approved for HIV treatment, and Merck’s multi-patent portfolio around its solid dosage formulations represents a textbook lifecycle management strategy. For competitors and generic manufacturers, the layered claims across four patents — spanning at least a decade of filing activity — mean that designing around any single patent does not clear the path to market. The consent judgment’s confirmation of infringement across all four Licensed Patents reinforces the portfolio’s commercial and legal robustness, making future ANDA challenges against this compound materially more difficult.
Should you run an FTO against US9649311B2 and the raltegravir patent portfolio?
Any company developing solid oral formulations containing raltegravir — or formulations of integrase inhibitors with structurally similar composition claims — should treat this consent judgment as a direct signal to conduct freedom-to-operate analysis. The four Licensed Patents cover raltegravir as the sole active ingredient in pharmaceutical compositions; companies developing combination products or next-generation integrase inhibitors with overlapping formulation claims should assess claim scope carefully. The injunction’s broad affiliate and successor language also creates risk for acquirers of any ANDA or NDA containing raltegravir.
PatSnap Eureka’s FTO Search Agent can map the full claim landscape across all four Licensed Patents — US7,754,731; US8,771,733; US9,649,311; and US10,772,888 — identifying where independent and dependent claims overlap with your formulation or ANDA specification. Eureka can also surface continuation applications and related prosecution history, helping R&D and regulatory teams assess whether reformulation strategies would clear the injunction scope before investing in further ANDA development.
Run a freedom-to-operate analysis on US9649311B2 to assess your product’s exposure
Run FTO in Eureka →Similar ANDA Integrase Inhibitor Patent Cases in the District of New Jersey
Cases below involve ANDA-triggered Hatch-Waxman patent litigation over HIV antiretroviral and integrase inhibitor formulations, predominantly litigated in the District of New Jersey.
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 Solid pharmaceutical compositions containing an integrase inhibitor-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.
DecidedMerck Sharp & Dohme, LLC’s broader IP enforcement history
Merck Sharp & Dohme, LLC’s full litigation history covering prior enforcement, licensing activity, and inter partes review proceedings.
Portfolio viewWhat this case signals for the ANDA pharmaceutical patent IP landscape
Merck’s clean sweep on a four-patent portfolio signals the continued potency of layered patent protection in HIV antiretroviral drug litigation.
Stacked patent portfolios deter ANDA challengers pre-trial
Merck asserted four patents with staggered filing dates and expiries — a classic lifecycle management strategy. When a generic challenger faces multiple valid, layered patents covering the same active ingredient, the litigation cost and risk calculus often favours settlement or consent judgment over a full invalidity trial. Companies with single-patent protection are comparatively more exposed to generic entry.
Consent judgments with no costs awarded signal negotiated resolution dynamics
The explicit ‘no costs, no attorneys’ fees’ clause — combined with the FDA ANDA approval carve-out — is a strong signal that commercial negotiations accompanied the legal settlement. In Hatch-Waxman litigation, these clauses often appear alongside undisclosed licence agreements setting a future authorised-generic entry date. Monitoring Merck’s ANDA approval records for No. 217990 may reveal the actual commercial terms.
US10772888B2’s 2020 grant date extends raltegravir exclusivity well beyond earlier patents
The newest Licensed Patent, US10772888B2, was granted in 2020 from application US15/483030. Its later priority date and grant suggest Merck’s raltegravir exclusivity runway extends significantly beyond the original compound patents. Any generic seeking to design around must overcome this most recent grant — raising the effective barrier for future ANDA filers against this composition portfolio.
D.N.J. consent judgment enforcement clause creates ongoing litigation risk for Lupin
The court retained jurisdiction to enforce or supervise performance under the consent judgment. This means any future Lupin product containing raltegravir as the sole active ingredient — even under a reformulated ANDA — could trigger contempt proceedings in D.N.J. without a new lawsuit. Lupin’s affiliates and successors worldwide should map this exposure before pursuing any raltegravir programme.
Merck v Lupin — key questions answered
The consent judgment required Lupin to stipulate that its ANDA No. 217990 raltegravir product infringes four Merck patents and to accept a permanent injunction barring it from making, using, selling, offering to sell, or importing that product in the U.S. All claims and counterclaims were dismissed with prejudice, with no costs or fees to either party.
Merck asserted four U.S. patents: Nos. 7,754,731; 8,771,733; 9,649,311; and 10,772,888 — collectively the ‘Licensed Patents’ in the consent judgment. All four cover solid pharmaceutical compositions containing raltegravir as the sole active ingredient, the HIV integrase inhibitor marketed as Isentress.
No. The consent judgment explicitly states it does not restrict the FDA from approving ANDA No. 217990. This carve-out is standard in Hatch-Waxman consent judgments and preserves the possibility that Merck could grant Lupin an authorised-generic licence for a future agreed entry date, though no such arrangement is disclosed in the public record.
No. The consent judgment dismisses all of Lupin’s counterclaims — which in ANDA litigation would include invalidity and non-infringement defences — with prejudice. Dismissal with prejudice bars Lupin from relitigating those same claims in any future action. Lupin also accepted the infringement stipulation voluntarily, waiving its right to appeal the merits.
Dismissed with prejudice means the case is finally resolved and cannot be refiled — it is treated as a merits adjudication. ‘Without costs’ means neither party was awarded litigation expenses or attorneys’ fees, an outcome that typically signals a negotiated resolution where both parties made concessions, rather than a clean win for one side on the merits.
Monitor raltegravir ANDA filings and integrase inhibitor IP with PatSnap
Track new ANDA challenges against Merck’s integrase inhibitor portfolio and run FTO searches against the four Licensed Patents before investing in raltegravir formulation development. PatSnap Eureka surfaces continuation families, litigation history, and claim scope in one workflow.
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