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Merck v. Hetero: Doravirine HIV Drug Patent Consent Judgment | PatSnap
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Case ID2:22-cv-06820
FiledNov 2022
ClosedNov 2024
Patent Litigation

Merck v. Hetero: HIV Drug Consent Judgment After 723-Day ANDA Battle

Merck Sharp & Dohme sued Hetero USA and Hetero Labs over ANDA No. 217747, a generic version of its doravirine/tenofovir disoproxil fumarate/lamivudine HIV combination therapy, asserting US10603282 and US10842751. The parties resolved the dispute by consent judgment — with Hetero conceding validity and infringement and accepting a permanent injunction — after nearly two years of litigation in the District of New Jersey.

Resolution time
723days
723 days — above median for ANDA patent cases in D.N.J., typically resolved in 12–24 months
Patents asserted
2
US10603282 and US10842751 — doravirine/TDF/3TC HIV combination therapy formulations
Outcome
Consent Judgment
Hetero stipulated to validity, infringement, and a permanent injunction barring U.S. commercialisation
Cost ruling
No Costs
Parties agreed no costs, disbursements, or attorneys’ fees awarded to either side
Published by PatSnap Insights Team · Verified by PatSnap Eureka Data
Case overview

Merck locks in permanent injunction over generic HIV triple therapy

Filed on 28 November 2022 in the U.S. District Court for the District of New Jersey, this ANDA litigation arose after Hetero USA, Inc. and its Indian parent Hetero Labs Limited sought FDA approval (ANDA No. 217747) to market a generic version of Merck’s doravirine/tenofovir disoproxil fumarate/lamivudine combination — an HIV-1 treatment marketed as Delstrigo. Merck asserted three patents: US8,486,975, US10,603,282, and US10,842,751, collectively designated as the ‘Licensed Patents’ under the consent judgment.

The case closed on 20 November 2024 via a consent judgment and permanent injunction. Critically, Hetero stipulated — for purposes of this action — that the Licensed Patents are valid and enforceable and that the Hetero Product infringes them. Hetero, its affiliates, successors, and assigns are permanently enjoined from making, using, selling, offering to sell, importing, or distributing the ANDA product in the United States. All claims, counterclaims, and affirmative defenses were dismissed with prejudice, with no costs awarded to either party.

The 723-day duration suggests meaningful pre-trial litigation before the parties converged on a negotiated exit — longer than many ANDA consent judgments that resolve within one Hatch-Waxman 30-month stay window. The public record does not disclose any licence entry date or revenue-sharing arrangement, which is typical for ANDA settlements where commercialisation terms are confidential. What is clear is that Merck achieved its primary litigation objective: blocking generic market entry for the duration of the Licensed Patents.

Case at a glance
Case no.2:22-cv-06820
CourtNew Jersey
JudgeN/A
FiledNovember 28, 2022
ClosedNovember 20, 2024
Duration723 days
OutcomeConsent Judgment
Verdict causeInfringement Action
BasisConsent Judgment
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Case data sourced from PACER / New Jersey District Court via PatSnap Eureka Litigation Intelligence Explore similar cases ↗
Case timeline

Filing to Consent Judgment in 723 days

723 days — above median for ANDA patent cases in D.N.J., typically resolved in 12–24 months

Case timeline: Complaint filed NOV 28 2022, NOV–DEC — 723 days total Horizontal timeline showing the three key events in Merck Sharp & Dohme, LLC v Hetero USA, Inc. from filing to resolution. Source: PACER, New Jersey District Court. NOV 28 2022 Complaint filed Pre-trial proceedings NOV 20 2024 Consent Judgment 723 DAYS TOTAL
Consent Judgment terms

Permanent injunction secured: what Merck’s consent judgment means for both parties

Legal mechanism

Consent judgment is not a dismissal — it is a court order

Unlike a voluntary dismissal, a consent judgment is entered by the court and carries full judicial authority. Here the parties jointly moved for entry of judgment, with the court retaining jurisdiction to enforce it. Hetero’s stipulations on validity and infringement — though limited to this action — are binding and enforceable. The permanent injunction can be enforced directly by Merck and its successors without filing a new lawsuit.

Court-enforceable order
Patent holder outcome

Merck secures generic market exclusion without going to trial

Merck obtained exactly what an ANDA plaintiff seeks: a permanent injunction preventing Hetero from commercialising ANDA No. 217747 in the United States. Hetero’s concession of infringement and validity for purposes of this action strengthens Merck’s enforcement posture. No costs were awarded, but Merck avoided the uncertainty of a merits ruling — protecting its HIV franchise revenues tied to Delstrigo through the patent term.

Permanent injunction granted
Generic challenger outcome

Hetero blocked from U.S. market entry on its doravirine ANDA

Hetero’s ANDA No. 217747 is effectively frozen — the injunction bars all U.S. commercial activity across Hetero USA, Hetero Labs, and their affiliates. While the stipulations are limited to this action, Hetero cannot launch the product without breaching the court order. Any future entry would require either patent expiry, a licence negotiation with Merck, or a successful IPR or reexamination of the Licensed Patents — none of which is disclosed in the public record.

ANDA commercialisation enjoined
Commercial implications

HIV combination therapy patents reinforced as an enforcement tool

This outcome signals that Merck’s doravirine combination patents — US10603282 and US10842751 — are sufficiently robust to deter Hetero from litigating to judgment. Other ANDA filers for doravirine-based combinations should treat these patents as high-risk assets requiring thorough validity and FTO analysis before filing a Paragraph IV certification. The no-costs provision is standard, but the absence of a disclosed licence date suggests Merck is not yet willing to grant early market access.

High barrier to generic entry
Legal analysis based on PACER docket records for case 2:22-cv-06820 and PatSnap Eureka litigation intelligence Search PatSnap Eureka ↗
Parties and representation

Full party and counsel information

RoleNameTypeDetail
PlaintiffMerck Sharp & Dohme, LLCCompanyGlobal pharmaceutical innovator — holder of US10603282 and US10842751 covering HIV combination therapySearch in Eureka ↗
DefendantHetero USA, Inc.CompanyGeneric drug manufacturer (U.S. subsidiary and Indian parent) seeking ANDA approval for doravirine/TDF/3TCSearch in Eureka ↗
Co-DefendantHetero Labs LimitedIndividualSearch in Eureka ↗
Co-DefendantHetero Labs LimitedIndividualSearch in Eureka ↗
Plaintiff counselAlexander Lee CalloAttorneyCounsel for Merck Sharp & Dohme, LLCSearch in Eureka ↗
Plaintiff counselCharles Michael LizzaAttorneyCounsel for Merck Sharp & Dohme, LLCSearch in Eureka ↗
Plaintiff counselSarah Ann SullvianAttorneyCounsel for Merck Sharp & Dohme, LLCSearch in Eureka ↗
Plaintiff counselWilliam C. BatonAttorneyCounsel for Merck Sharp & Dohme, LLCSearch in Eureka ↗
Plaintiff law firmSaul Ewing LLPLaw FirmRepresenting Merck Sharp & Dohme, LLCSearch in Eureka ↗
Defendant counselEric I. AbrahamAttorneyCounsel for Hetero USA, Inc.Search in Eureka ↗
Defendant counselKristine L. ButlerAttorneyCounsel for Hetero USA, Inc.Search in Eureka ↗
Defendant counselStephanie-Rose OrlandoAttorneyCounsel for Hetero USA, Inc.Search in Eureka ↗
Defendant counselWilliam MurthaAttorneyCounsel for Hetero USA, Inc.Search in Eureka ↗
Defendant law firmHill Wallack LLPLaw FirmRepresenting Hetero USA, Inc.Search in Eureka ↗
Presiding judgeJudge N/AJudgeNew Jersey District CourtSearch in Eureka ↗
Official verdict

Official order — verbatim text

“Merck Sharp & Dohme LLC (“Merck”), and Hetero Labs Limited, Hetero Labs Limited Unit-V, and Hetero USA, Inc. (collectively “Hetero”), the parties in the above-captioned action, have agreed to resolve this action for good cause. Now the parties, by their respective undersigned attorneys, hereby stipulate and consent to entry of judgment and an injunction in the action, as follows: IT IS this _____ day of _____________________, 2024: ORDERED, ADJUDGED, AND DECREED as follows: 20th November Case 2:22-cv-06820-ES-CLW Document 82 Filed 11/20/24 Page 1 of 3 PageID: 787 1. This District Court has jurisdiction over the subject matter of the above action and has personal jurisdiction over the parties. 2. As used in this Consent Judgment, (i) the term “Hetero Product” shall mean the drug product sold, offered for sale, or distributed pursuant to Abbreviated New Drug Application No. 217747 as agreed by the parties; (ii) the term “Licensed Patents” shall mean United States Patent Numbers 8,486,975, 10,603,282, and 10,842,751; and (iii) the term “Affiliate” shall mean any entity or person that, directly or indirectly through one or more intermediaries, controls, is controlled by, or is under common control with Hetero; for purposes of this definition, “control” means (a) ownership, directly or through one or more intermediaries, of (1) more than fifty percent (50%) of the shares of stock entitled to vote for the election of directors, in the case of a corporation, or (2) more than fifty percent (50%) of the equity interests in the case of any other type of legal entity or status as a general partner in any partnership, or (b) any other arrangement whereby an entity or person has the right to elect a majority of the Board of Directors or equivalent governing body of a corporation or other entity or the right to direct the management and policies of a corporation or other entity. 3. For purposes of this action only, the Licensed Patents are valid and enforceable. 4. For purposes of this action only, the Hetero Product infringes the Licensed Patents. 5. Unless otherwise specifically agreed between the parties, Hetero, including any of its Affiliates, successors, and assigns, is enjoined from infringing the Licensed Patents, on its own part or through any Affiliate, by making, having made, using, selling, offering to sell, importing, or distributing of the Hetero Product in the United States. Case 2:22-cv-06820-ES-CLW Document 82 Filed 11/20/24 Page 2 of 3 PageID: 788 6. Compliance with this Consent Judgment may be enforced by Merck and its successors in interest, or assigns. 7. This District Court retains jurisdiction to enforce or supervise performance under this Consent Judgment. 8. All claims, counterclaims, affirmative defenses, and demands in this action are hereby dismissed with prejudice and without costs, disbursements, or attorneys’ fees to any party. We hereby consent to the form and entry of this Order:”
Source: PACER Docket, Case 2:22-cv-06820, New Jersey District Court

The consent judgment is unusually explicit in its concessions: Hetero stipulated — for purposes of this action — both the validity and enforceability of all three Licensed Patents and their infringement by the Hetero Product. While the ‘for purposes of this action only’ carve-out preserves Hetero’s theoretical ability to challenge the patents in a separate PTAB proceeding, the permanent injunction makes commercial launch practically impossible without a successful IPR outcome. Merck retains court jurisdiction for enforcement, giving it a direct contempt mechanism against any attempted market entry.

PACER case 2:22-cv-06820 · Public docket record Explore in Eureka ↗
Patent at issue

US10603282 & US10842751 — doravirine HIV combination therapy formulations

Publication No.US10603282B2
Application No.US15/780142
Patent details
ProductDoravirine/tenofovir disoproxil fumarate/lamivudine HIV-1 combination drug formulations
Cited in actionNovember 28, 2022

Publication No.US10842751B2
Application No.US16/791398
Patent details
ProductPharmaceutical compositions and methods for doravirine-based HIV combination therapy
Cited in actionNovember 28, 2022

US10,603,282 (App. No. 15/780,142) and US10,842,751 (App. No. 16/791,398) cover pharmaceutical compositions and methods relating to the fixed-dose combination of doravirine (a non-nucleoside reverse transcriptase inhibitor), tenofovir disoproxil fumarate, and lamivudine — the three-component HIV-1 regimen marketed by Merck as Delstrigo. These are formulation and combination-use patents that protect the specific dosage form approved by the FDA, layering protection on top of the underlying doravirine compound patents.

From a competitive standpoint, formulation patents on fixed-dose HIV combinations are among the most commercially critical assets in the branded pharmaceutical arsenal — they extend effective exclusivity well beyond compound patent expiry. Any generic manufacturer seeking to market a bioequivalent to Delstrigo must either design around these claims, invalidate them at the PTAB, or negotiate a licence. This case demonstrates that Merck is willing to enforce these patents aggressively in D.N.J., the preferred venue for Hatch-Waxman ANDA litigation.

Patent data sourced from USPTO via PatSnap Eureka patent database Search patent records in Eureka ↗
Freedom to operate

Should you run an FTO against US10603282 and US10842751?

Any pharmaceutical company with an ANDA pending or in preparation for a doravirine/TDF/3TC fixed-dose combination must treat US10,603,282 and US10,842,751 as primary blocking patents. The same analysis applies to R&D teams developing novel HIV combination regimens that incorporate doravirine as a component — even reformulated or modified-release variants may fall within claim scope depending on formulation specifics. Hetero’s litigation outcome illustrates the downside of proceeding to ANDA filing without a clear invalidity or non-infringement position.

PatSnap Eureka’s FTO Search Agent can map the full claim landscape of both patents, identify prior art that could support a PTAB challenge, and flag continuation applications that Merck may file to extend coverage. R&D and regulatory teams can use Eureka to benchmark their formulation design choices against the asserted claims before committing to an ANDA strategy — reducing the risk of injunction exposure of the kind Hetero now faces.

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Related litigation

Similar ANDA patent cases: HIV antiviral formulation disputes in D.N.J.

Explore comparable Hatch-Waxman infringement actions involving HIV antiviral combination therapy patents litigated in the District of New Jersey.

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Merck Sharp & Dohme, LLC patent enforcement history, New Jersey case history, Merck Sharp & Dohme, LLC’s full IP portfolio, and comparable case analysis
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Strategic implications

What this case signals for the HIV antiviral patent landscape

This consent judgment reinforces Merck’s grip on the doravirine franchise and raises the stakes for any generic filer targeting these formulation patents.

Paragraph IV filers targeting doravirine face a high-risk patent cluster

With three patents — including US8,486,975, US10,603,282, and US10,842,751 — covering the doravirine/TDF/3TC combination, any new ANDA filer must contend with a layered assertion strategy. Hetero’s concession of validity and infringement, even limited to this action, suggests the patents presented formidable challenges under litigation scrutiny.

Consent judgments with permanent injunctions are a strong ANDA outcome for innovators

Merck’s resolution avoids the risk of an adverse validity ruling while locking in a court-enforceable injunction. IP teams at branded pharma companies should note: a negotiated consent judgment can deliver the same market-exclusion result as a trial win without the appellate risk exposure that a contested judgment carries.

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Unlock PTAB risk analysis and portfolio mapping for Merck’s HIV antiviral patents litigated at D.N.J. district court level.
PTAB challenge risk scoreComparable ANDA outcomesMerck doravirine portfolio map
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Frequently asked questions

Merck v Hetero — key questions answered

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Monitor ANDA threats to your HIV antiviral IP portfolio

This case shows how quickly ANDA litigation can result in a permanent injunction. PatSnap Eureka helps pharma IP teams track new ANDA filings, Paragraph IV certifications, and PTAB petitions targeting their key patents — giving you the earliest possible warning of a generic challenge.

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