Eisai & MSD v. Torrent Pharmaceuticals: Lenvatinib Patent Consent Judgment
Eisai and MSD International Business GmbH brought an ANDA-triggered infringement action against Torrent Pharmaceuticals in New Jersey over lenvatinib mesylate capsules (LENVIMA), asserting three patents. After 514 days, the parties resolved the dispute via a negotiated consent judgment that enjoins Torrent from marketing its generic until the asserted patents expire.
ANDA battle over cancer drug lenvatinib ends in Eisai’s favour
Filed on 17 June 2024 in the District of New Jersey, this Hatch-Waxman action was brought by Eisai R&D Management Co., Ltd., Eisai Co., Ltd., Eisai Manufacturing Ltd., Eisai Inc., and MSD International Business GmbH against Torrent Pharmaceuticals Ltd. The suit targeted Torrent’s Abbreviated New Drug Application No. 219352 seeking approval to market lenvatinib mesylate capsules (equivalent to 4 mg and 10 mg base), a bioequivalent to Eisai’s oncology product LENVIMA, which is approved for thyroid cancer, hepatocellular carcinoma, and endometrial carcinoma in combination with pembrolizumab.
The case closed on 13 November 2025 through a consent judgment — a negotiated settlement converted into a binding court order. Under its terms, Torrent acknowledged the validity and enforceability of US10,407,393 and US11,186,547 with respect to its ANDA product and any generic equivalent containing lenvatinib referencing NDA No. 206947. Torrent is enjoined from manufacturing, selling, or importing its generic lenvatinib product in the United States prior to expiration of both patents. All claims and counterclaims were dismissed with prejudice, with no costs to either party.
At 514 days from filing to closure, the timeline is consistent with a case that proceeded through early litigation posture before reaching settlement — likely after claim construction signalling or early merits assessment. The public record does not disclose a licensed entry date, leaving the commercial terms of the Settlement Agreement confidential. What is confirmed is that Torrent retains the right to maintain its Paragraph IV certifications, suggesting a potential future authorised entry window exists under undisclosed terms in the private settlement agreement.
Filing to Consent Judgment in 514 days
514 days — longer than the median ANDA Hatch-Waxman district court resolution
Consent judgment: what Torrent’s validity acknowledgment means for both sides
Consent judgment converts settlement into enforceable court order
A consent judgment is more than a settlement — it is a binding judicial decree that the District Court retains jurisdiction to enforce. By stipulating to its entry, Torrent accepted an injunction that carries contempt-of-court consequences for any violation, giving Eisai a stronger enforcement posture than a private settlement agreement alone would provide. The court’s retained jurisdiction clause further strengthens Eisai’s hand if Torrent’s affiliates or successors attempt to commercialise the product.
Judicially enforceable injunctionTorrent’s validity acknowledgment fortifies Eisai’s patent estate
Crucially, Torrent expressly acknowledged that US10,407,393 and US11,186,547 are valid and enforceable and that one or more claims would be infringed by its ANDA product. This admission is on the public record and may be cited in subsequent ANDA litigations against other generic filers. For Eisai and MSD, the outcome preserves the commercial exclusivity of LENVIMA while setting a precedent that discourages straightforward validity challenges from other generic applicants referencing the same NDA.
Validity acknowledged on recordTorrent enjoined, but Paragraph IV rights preserved for future entry
Torrent is barred from commercialising its ANDA product prior to patent expiry of both asserted patents unless specifically authorised under the private Settlement Agreement. However, the consent judgment explicitly preserves Torrent’s right to maintain its Paragraph IV certifications — a deliberate carve-out that typically signals a negotiated future launch date tied to patent expiry or a confidential licence. The true commercial cost to Torrent depends on the undisclosed entry date in the settlement.
Paragraph IV certifications preservedOn-record validity raises the bar for lenvatinib generic competition
With Torrent’s admission in the public record, other ANDA filers for lenvatinib face a higher effective burden: any generic entrant challenging US10,407,393 or US11,186,547 must now contend with a prior judicial record of acknowledged validity. This dynamic typically delays the broader generic market entry and extends the commercially valuable exclusivity window for LENVIMA across its oncology indications. Companies monitoring lenvatinib FTO should treat both patents as high-risk barriers until their expiry dates.
Elevated barrier for ANDA challengersFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Eisai | Individual | Global oncology pharma group — holder of US10407393, US11186547, and US7612208Search in Eureka ↗ |
| Co-Plaintiff | MSD International Business, GmbH | Company | Search in Eureka ↗ |
| Co-Plaintiff | EISAI MANUFACTURING LTD. | Company | Search in Eureka ↗ |
| Co-Plaintiff | Eisai, Inc. | Company | Search in Eureka ↗ |
| Co-Plaintiff | Eisai Co., Ltd. | Company | Search in Eureka ↗ |
| Defendant | Torrent Pharmaceuticals, Ltd. | Company | India-based generic pharmaceutical manufacturer seeking ANDA approval for lenvatinibSearch in Eureka ↗ |
| Plaintiff counsel | J. BRUGH LOWER | Attorney | Counsel for EisaiSearch in Eureka ↗ |
| Plaintiff counsel | Lucas L. Kressel | Attorney | Counsel for EisaiSearch in Eureka ↗ |
| Plaintiff counsel | Stephen R. Donat | Attorney | Counsel for EisaiSearch in Eureka ↗ |
| Plaintiff counsel | William P. Deni , Jr. | Attorney | Counsel for EisaiSearch in Eureka ↗ |
| Plaintiff law firm | Gibbons PC | Law Firm | Representing EisaiSearch in Eureka ↗ |
| Plaintiff law firm | Paul Hastings, LLP | Law Firm | Representing EisaiSearch in Eureka ↗ |
| Defendant counsel | Stuart D. Sender | Attorney | Counsel for Torrent Pharmaceuticals, Ltd.Search in Eureka ↗ |
| Defendant law firm | Windels Marx Lane & Mittendorf, LLP | Law Firm | Representing Torrent Pharmaceuticals, Ltd.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | New Jersey District CourtSearch in Eureka ↗ |
Official order — verbatim text
The consent judgment’s language is strategically weighted toward Eisai: Torrent’s acknowledgment that the two key patents ‘are valid and enforceable’ and that claims ‘would be infringed’ goes beyond a typical no-contest settlement. In Hatch-Waxman practice, such admissions are uncommon and commercially significant — they create a public record that raises the burden for any subsequent ANDA challenger seeking to invalidate the same patents. The Paragraph IV carve-out, however, preserves optionality for Torrent under undisclosed settlement terms.
US10407393B2 & US11186547B2 — lenvatinib compound and formulation patents
US10,407,393B2 and US11,186,547B2 are among the key exclusivity pillars protecting LENVIMA (lenvatinib mesylate), Eisai’s multi-kinase inhibitor approved for differentiated thyroid cancer, hepatocellular carcinoma, and endometrial carcinoma. US7,612,208B2, also asserted, is understood to cover earlier compound chemistry. The patents derive from application filings spanning multiple years, reflecting a layered prosecution strategy designed to extend effective market exclusivity beyond the original compound patent.
In the competitive oncology generics landscape, lenvatinib represents a high-value target: LENVIMA generated significant global revenues for the Eisai-MSD collaboration, making ANDA challenges economically attractive for generic manufacturers. The involvement of MSD International Business GmbH as a co-plaintiff reflects the co-commercialisation arrangement for certain LENVIMA indications. The consent judgment’s validity acknowledgment for the two later-expiring patents now functions as a deterrent signal to other potential ANDA filers contemplating validity challenges.
Should you run an FTO analysis against US10407393 and US11186547?
Any company developing or manufacturing a lenvatinib-containing product, a lenvatinib mesylate formulation, or a multi-kinase inhibitor referencing NDA No. 206947 as the reference-listed drug should treat US10,407,393B2 and US11,186,547B2 as high-priority FTO barriers. The consent judgment’s validity acknowledgment strengthens their enforceability posture. R&D teams working on next-generation tyrosine kinase inhibitors with structural similarity to lenvatinib should also assess claim scope carefully.
PatSnap Eureka’s FTO Search Agent can map the claim landscapes of US10,407,393, US11,186,547, and US7,612,208 against your compound or formulation, identify the patent family members across jurisdictions, and flag related pending applications that may extend the exclusivity window further. Use Eureka to benchmark expiry timelines against known ANDA filing windows and to monitor any new continuation or divisional applications in the lenvatinib family.
Run a freedom-to-operate analysis on US11186547B2 to assess your product’s exposure
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DecidedEisai’s broader IP enforcement history
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Portfolio viewWhat this case signals for the oncology ANDA litigation landscape
Consent judgments with validity admissions are among the most powerful tools in an innovator’s ANDA enforcement arsenal.
Validity admissions in consent judgments ripple across pending ANDA disputes
Torrent’s on-record acknowledgment that US10,407,393 and US11,186,547 are valid and infringed creates a persuasive public record. Eisai can reference this consent judgment in any parallel or future ANDA litigation over lenvatinib, increasing the cost and complexity of any validity challenge another generic filer might pursue.
Retained jurisdiction clauses extend Eisai’s enforcement reach post-settlement
The District Court’s explicit retention of jurisdiction to enforce or supervise the consent judgment means Eisai does not need to file a new lawsuit to act against Torrent or its affiliates. This is a meaningful commercial safeguard for a high-revenue oncology product, particularly given the broad affiliate and successor language in the judgment.
Undisclosed entry date is the key commercial variable to monitor
The Settlement Agreement’s confidential launch-date provision is where the real commercial outcome resides. Companies tracking LENVIMA market dynamics should watch for Orange Book patent expiry dates for US10,407,393 and US11,186,547 — these define the latest possible Torrent entry and inform pricing strategy and biosimilar/generic entry modelling.
Three-patent assertion strategy signals Eisai’s layered exclusivity approach
Eisai asserted US7612208 (compound patent), US10407393, and US11186547 in a staggered-expiry stack — a classic multi-layer exclusivity strategy. The consent judgment only required validity acknowledgment for the two later-expiring patents, suggesting US7612208 may have been resolved or leveraged differently. Understanding this layering is critical for any FTO analysis in the lenvatinib space.
Eisai v Torrent — key questions answered
Torrent acknowledged that US10,407,393 and US11,186,547 are valid and enforceable with respect to its ANDA product and any generic lenvatinib equivalent referencing NDA No. 206947, and that one or more claims would be infringed. This on-record admission is atypical in ANDA settlements and strengthens Eisai’s position against future challengers.
Eisai and MSD asserted three patents: US10,407,393B2, US11,186,547B2, and US7,612,208B2. The consent judgment specifically addresses validity and enforceability of US10,407,393 and US11,186,547. US7,612,208 was listed in the complaint but is not the subject of an express validity acknowledgment in the published consent judgment.
The consent judgment enjoins Torrent from commercialising its ANDA product prior to expiry of the two asserted patents, except as specifically authorised under the private Settlement Agreement. Torrent’s preserved Paragraph IV certifications suggest a confidential licensed entry date may exist in the settlement, consistent with standard Hatch-Waxman practice.
MSD International Business GmbH is a co-plaintiff likely reflecting the co-development and co-commercialisation arrangement between Eisai and Merck (MSD) for LENVIMA, particularly for the pembrolizumab combination therapy indications. As a rights-holder or licensee with standing, MSD joined the enforcement action to protect its commercial interest in lenvatinib exclusivity.
The retained jurisdiction clause means Eisai and MSD do not need to file a new lawsuit to enforce the consent judgment’s injunction. If Torrent or its affiliates breach the injunction, Eisai can return directly to the District of New Jersey to seek contempt proceedings or other remedies, providing a faster and more powerful enforcement mechanism than contractual breach claims alone.
Monitor lenvatinib patent expiry and ANDA filings in real time
PatSnap Eureka tracks every ANDA filing, Orange Book listing change, and patent family development for the LENVIMA portfolio. Set alerts for US10,407,393 and US11,186,547 to stay ahead of generic entry risk across oncology markets.
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