Amicus Therapeutics v. Lupin: Migalastat ANDA Dispute Ends in Consent Judgment
Amicus Therapeutics filed suit against Lupin in Delaware over three patents protecting migalastat (Galafold), the first oral pharmacological chaperone therapy for Fabry disease. After 843 days, the case resolved through a consent judgment in which Lupin acknowledged infringement and accepted an injunction — paired with a separate licence agreement governing future generic entry.
ANDA infringement resolved by consent judgment and licence deal
Amicus Therapeutics US, LLC and Amicus Therapeutics, Inc. (collectively ‘Amicus’) filed this Hatch-Waxman action on 1 September 2023 in the District of Delaware against Lupin Limited and Lupin Pharmaceuticals, Inc. (collectively ‘Lupin’), asserting U.S. Patent Nos. 11,633,388; 11,833,164; and 12,042,490 — all covering migalastat hydrochloride 123 mg capsules marketed as Galafold for the treatment of Fabry disease. The trigger was Lupin’s submission of ANDA No. 217793 to the FDA, which Amicus characterised as an act of infringement under 35 U.S.C. § 271(e)(2).
On 22 December 2025, Judge Christopher J. Burke entered a consent judgment resolving all claims. Critically, Lupin acknowledged infringement of the asserted patents and consented to a permanent injunction barring commercial manufacture, sale, importation, or distribution of any generic migalastat product covered by ANDA No. 217793, except as authorised under a separately executed licence agreement. All claims were formally dismissed without prejudice, and each party agreed to bear its own costs and fees. The court retained jurisdiction to enforce both the consent judgment and the licence agreement.
At 843 days, the case ran longer than many ANDA disputes that settle pre-trial, suggesting substantive negotiations over the scope and timing of any licenced generic entry rather than an early capitulation by either party. The existence of a separate, contemporaneously executed licence agreement — whose commercial terms remain confidential — is the strategically significant unknown: it likely governs an authorised generic launch date, royalty structure, or market-entry trigger that will determine when and how patients gain access to lower-cost migalastat. The public record does not disclose those terms.
Filing to Consent Judgment in 843 days
843 days from filing to consent judgment — above the median for Delaware ANDA patent cases
Consent judgment and licence: what the resolution means for both parties
Consent judgment: infringement acknowledged, injunction entered
A consent judgment is a court-ordered settlement that carries the force of a judicial decree. Here, Lupin expressly acknowledged infringement under 35 U.S.C. § 271(e)(2) and accepted a permanent injunction. This is stronger than a simple dismissal — it creates an enforceable court order and a formal infringement admission on the record, binding Lupin’s successors, assigns, and affiliates. The court retained jurisdiction to enforce both the judgment and the related licence agreement.
Enforceable court orderAmicus secures infringement acknowledgment and patent validation
Amicus achieved the strongest available negotiated outcome short of a trial win: a formal judicial record that Lupin infringed its migalastat patents. The injunction blocks unlicensed generic migalastat entry from Lupin’s ANDA. Combined with a confidential licence agreement — likely governing authorised generic entry timing — Amicus retains control over the migalastat market while avoiding the cost and uncertainty of trial. The asserted patents are neither invalidated nor subjected to further challenge in this proceeding.
Patents upheld via consentLupin obtains a licence but concedes infringement on the record
By acknowledging infringement and accepting an injunction, Lupin foregoes any invalidity or non-infringement argument in this case. However, the simultaneous execution of a licence agreement suggests Lupin secured a defined pathway to market — most likely a future authorised generic launch date. The dismissal ‘without prejudice’ preserves theoretical future claims, though the consent judgment’s infringement admission significantly constrains Lupin’s litigation posture in any subsequent dispute over the same patents.
Licenced entry pathwayConfidential licence terms will dictate Fabry disease generic market timing
Migalastat (Galafold) generated substantial revenues for Amicus as the only approved oral pharmacological chaperone for Fabry disease. The consent judgment structurally delays unlicensed generic competition from Lupin while the undisclosed licence terms — potentially including an entry date, royalty, or milestone — govern authorised access. Other generic filers with pending migalastat ANDAs should treat this outcome as a signal that Amicus will actively enforce its patent estate and extract consent-judgment-level terms from challengers.
Generic entry date unknownFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Amicus Therapeutics US, LLC | Company | Rare disease biopharmaceutical company — holder of US11,633,388; US11,833,164; US12,042,490Search in Eureka ↗ |
| Co-Plaintiff | Amicus Therapeutics, Inc. | Company | Search in Eureka ↗ |
| Defendant | Lupin Limited | Individual | Indian generic pharmaceutical manufacturer and its US subsidiary, filer of ANDA No. 217793Search in Eureka ↗ |
| Co-Defendant | Lupin Pharmaceuticals, Inc. | Company | Search in Eureka ↗ |
| Plaintiff counsel | Chad S.C. Stover | Attorney | Counsel for Amicus Therapeutics US, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Christina M. Baugh | Attorney | Counsel for Amicus Therapeutics US, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Joshua E. Ney | Attorney | Counsel for Amicus Therapeutics US, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Mark C. Nelson | Attorney | Counsel for Amicus Therapeutics US, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Barnes & Thornburg, LLP | Law Firm | Representing Amicus Therapeutics US, LLCSearch in Eureka ↗ |
| Defendant counsel | John C. Phillips , Jr. | Attorney | Counsel for Lupin LimitedSearch in Eureka ↗ |
| Defendant law firm | Phillips, McLaughlin & Hall PA | Law Firm | Representing Lupin LimitedSearch in Eureka ↗ |
| Presiding judge | Judge Christopher J. Burke | Judge | Delaware District CourtSearch in Eureka ↗ |
Official order — verbatim text
The consent judgment is notable for the breadth of what Lupin conceded: not merely a dismissal, but an express acknowledgment of infringement under 35 U.S.C. § 271(e)(2) and submission to a permanent injunction binding Lupin’s successors and affiliates. The formal dismissal ‘without prejudice’ of all claims is a procedural mechanism to close the docket while leaving the injunction and licence agreement as operative instruments. The consent judgment’s designation as a ‘consent decree’ under 21 U.S.C. § 355(j)(5)(B)(iii)(I)(bb) is also significant: it triggers the FDA pathway allowing final ANDA approval — indicating a licenced commercial launch, not a blanket exclusion, is the intended commercial outcome.
US11,633,388; US11,833,164; US12,042,490 — migalastat compositions for Fabry disease
The three asserted patents — US11,633,388; US11,833,164; and US12,042,490 — cover migalastat hydrochloride 123 mg capsules, the active pharmaceutical ingredient in Galafold, Amicus’s approved treatment for Fabry disease. Migalastat is a pharmacological chaperone that stabilises mutant forms of the enzyme alpha-galactosidase A. The patents span application dates from 2017 through to 2024, with US12,042,490 among the most recently granted, suggesting Amicus has actively prosecuted continuation and divisional claims to extend patent coverage over the product lifecycle.
Fabry disease is an ultra-rare lysosomal storage disorder with a small but high-value patient population, making the patent estate protecting Galafold commercially significant per unit. The broad filing strategy — seven application numbers cited across the full case record — reflects a lifecycle management approach common among rare disease innovators, where incremental claim refinement across continuations creates overlapping protection. For generic manufacturers, this layered portfolio means invalidating a single patent may be insufficient to clear a non-infringing path to market, increasing the commercial logic of negotiated licence agreements over litigation to judgment.
Should you run an FTO against the Amicus migalastat patent portfolio?
Any pharmaceutical company with an active or planned migalastat ANDA, authorised generic programme, or related alpha-galactosidase A chaperone development project should treat this case as a direct signal. Amicus demonstrated willingness to litigate for over 843 days and to extract an infringement acknowledgment and permanent injunction. The full patent estate cited in this case spans at least seven application numbers, meaning FTO analysis limited to Orange Book-listed patents alone is likely insufficient — continuation and divisional claims warrant independent review.
PatSnap Eureka’s FTO Search Agent enables R&D and IP teams to map the full Amicus migalastat portfolio, identify claim scope across continuations, and model expiry timelines relative to potential ANDA submission dates. Eureka can surface related family members, prosecution history flags, and comparable ANDA settlements to help you calibrate litigation risk before filing. Run a targeted FTO analysis now to assess your exposure before Amicus’s next enforcement action.
Run a freedom-to-operate analysis on US10383864B2 to assess your product’s exposure
Run FTO in Eureka →Similar migalastat and rare disease ANDA cases in Delaware
Cases involving Hatch-Waxman ANDA challenges to rare disease pharmacological chaperone patents in Delaware District Court, resolved by consent judgment or licence.
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 Migalastat hydrochloride capsules, eq 123 mg base-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.
DecidedAmicus Therapeutics US, LLC’s broader IP enforcement history
Amicus Therapeutics US, LLC’s full litigation history covering prior enforcement, licensing activity, and inter partes review proceedings.
Portfolio viewWhat this case signals for the rare disease ANDA IP landscape
Amicus’s consent judgment strategy reinforces how branded rare disease companies can convert ANDA litigation into durable market control through negotiated injunctions.
Consent judgments with infringement admissions raise the bar for future ANDA challengers
When a branded company secures a consent judgment that includes an express infringement acknowledgment — as Amicus did here — it creates a stronger precedent signal than a simple dismissal. Future ANDA filers targeting the same migalastat patents now face a record showing Lupin’s acknowledgment, which may influence settlement leverage and litigation risk assessments for subsequent generic challengers.
The undisclosed licence agreement is the operative commercial document
The public consent judgment resolves the litigation, but the separately executed licence agreement determines when generic migalastat reaches patients and at what economic terms. IP professionals advising generic manufacturers, payers, or competitors should monitor FDA exclusivity databases and any patent term extension filings to triangulate likely entry timing that the licence itself does not disclose.
Amicus’s multi-patent ANDA strategy signals layered lifecycle management
Amicus asserted three patents with varying grant dates — including US12,042,490 granted in 2024 — suggesting a deliberate evergreening strategy that extends the Orange Book-listed patent cliff. Generic entrants and FTO analysts should model expiry across the full cited portfolio, not just the earliest-filed patents, when projecting market entry windows for migalastat generics.
Delaware consent judgment jurisdiction clause creates enforcement leverage
Both parties consented to personal jurisdiction in Delaware for licence enforcement. This structurally favours Amicus: any future dispute over licence terms — including entry date compliance or royalty obligations — will be resolved in the same court that entered the injunction, a forum historically favourable to patent holders in Hatch-Waxman matters. Generic partners should review contractual dispute resolution clauses carefully.
Amicus v Lupin — key questions answered
Lupin formally acknowledged infringement of U.S. Patent Nos. 11,633,388; 11,833,164; and 12,042,490 under 35 U.S.C. § 271(e)(2) by virtue of its ANDA No. 217793 filing. This admission is part of the court-entered consent judgment dated 22 December 2025, making it a matter of judicial record binding on Lupin and its successors.
The simultaneously executed licence agreement — separate from the public consent judgment — is expected to govern the terms under which Lupin may commercially launch a generic migalastat product. Its specific terms, including any entry date, royalty, or milestone conditions, are not disclosed in the public record. The consent judgment’s FDA consent decree designation confirms that ANDA approval may proceed under the licence framework.
The consent judgment includes an express infringement acknowledgment and a permanent injunction, which significantly constrains Lupin’s future litigation posture regarding these patents. While the claims were dismissed ‘without prejudice’, any future challenge would need to contend with the on-record admission of infringement. The terms of the confidential licence agreement may also contain additional estoppel or challenge-limitation provisions not visible in the public filing.
Paragraph 7 of the consent judgment designates it as a ‘consent decree’ under 21 U.S.C. § 355(j)(5)(B)(iii)(I)(bb). This is a specific Hatch-Waxman mechanism that permits the FDA to grant final approval of Lupin’s ANDA No. 217793 on the date the consent judgment is entered, rather than waiting for patent expiry. It signals that an authorised, licenced generic launch — rather than indefinite exclusion — is the commercial endgame.
The case record lists seven application numbers in the patent involved field, while the consent judgment itself references three asserted patents — US11,633,388; US11,833,164; and US12,042,490. The additional application numbers likely represent related family members, continuations, or divisional applications in the same portfolio. This discrepancy is common in Hatch-Waxman litigation where Orange Book-listed patents differ from the full family cited in court documents.
Monitor Amicus migalastat enforcement before your next ANDA filing
This consent judgment signals that Amicus will actively defend its migalastat estate through injunctions and infringement admissions. Use PatSnap Eureka to run an FTO across the full portfolio and track any new ANDA enforcement activity before committing to development spend.
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