Analyzing the permissible scope of an injunction under the Hatch-Waxman Act, the US Court of Appeals for the Federal Circuit reversed the district court’s prohibitions on an open-label extension (OLE) of a then-running clinical trial and new clinical trials and remanded for further consideration of whether prohibiting a request for an additional indication was appropriate. Jazz Pharmaceuticals, Inc. v. Avadel CNS Pharmaceuticals LLC, Case No. 24-2274 (Fed. Cir. May 6, 2025) (Lourie, Reyna, Taranto, JJ.)

This appeal is one of several disputes between Jazz and Avadel regarding their competing sodium oxybate products. Jazz markets two such products: Xyrem, approved for treating excessive daytime sleepiness and certain cataplexy, and Xywav, which, in addition to Xyrem’s indications, also may be used for treating idiopathic hypersomnia. Avadel filed a § 505(b)(2) new drug application (NDA) to market its own product, Lumryz. During the pendency of the Lumryz application, Jazz obtained a patent and asserted that Avadel infringed it under 35 U.S.C. § 271(e)(2), part of the Hatch-Waxman Act, based on its filing of the Lumryz NDA. The patent was never Orange Book listed, so Avadel did not need to submit any patent certification.

The US Food & Drug Administration (FDA) approved Lumryz. Avadel launched the product, and Jazz amended its complaint to assert traditional § 271(a) – (c) infringement. Ultimately, Avadel and Jazz stipulated infringement, the patent was determined not invalid, and the jury awarded damages based on the post-launch infringement. After further proceedings, the district court permanently enjoined Avadel from seeking an idiopathic hypersomnia indication for Lumryz, offering an OLE phase of its then-running Lumryz idiopathic hypersomnia clinical trial, and against initiating new clinical trials. Avadel appealed, arguing that each of these restrictions was improper.

The Federal Circuit largely agreed with Avadel, reversing the first two prohibitions, and remanded the case back to the district court for further consideration of the prohibition against any new clinical trials. Turning first to the prohibition on new clinical trials, the Court held that initiating new trials for the purposes of submission to the FDA fell squarely within the Hatch-Waxman Safe Harbor for experimentation (under § 271(e)(1)) and thus could not be enjoined (per §271(e)(3)). Jazz unsuccessfully argued that Avadel had waived its Safe Harbor position, which required factual development.

Next, the Federal Circuit rejected the district court’s injunction against an OLE, concluding that the district court had not applied the Supreme Court’s four-factor eBay (2006) test for injunctions when deciding the appropriateness of such extraordinary relief. Refusing to determine whether an OLE extension qualified as safe-harbored activity in the first instance, the Court explained that only if such activity were deemed to be infringing on an appropriate record could it be enjoined.

Finally, with respect to prohibiting Avadel from seeking an idiopathic hypersomnia indication for Lumryz, the Federal Circuit concluded that the propriety of that restriction may turn on whether the infringement qualified under the Hatch-Waxman Act, reasoning that an injunction might run afoul of the § 271(e)(4) limitation on the scope of injunctive relief. Recognizing that this question turned on a significant issue not resolved by case law – whether and how the submission of an application with no corresponding Orange Book listing triggers the Hatch-Waxman Act’s applicability – the Court remanded for further development.

Practice Note: With the increased frequency of multiple rounds in innovator versus generic pharmaceutical litigation, parties are testing the boundaries of the Hatch-Waxman Act. The Jazz decision marks the most recent Federal Circuit decision elucidating the available remedies and causes of action under the Hatch-Waxman Act, leaving for another day the important question of what constitutes an infringing submission.