Sandoz Inc. v. Xavier Becerra, No. 22-5202 (D.C. Cir. 2023)Annotate this Case
Under the Hatch-Waxman Act, a drug may receive “new chemical entity exclusivity” if no active ingredient in the drug was previously “approved.” The drug Aubagio was awarded this exclusivity because the Food & Drug Administration (“FDA”) determined that Aubagio’s only active ingredient, teriflunomide, had never previously been approved. This case concerns a challenge to Aubagio’s exclusivity period, which Sandoz Inc. raises to secure a solo period of marketing exclusivity for its generic equivalent. Sandoz maintains that teriflunomide was previously “approved” as an impurity in the drug Arava. In the alternative, Sandoz argued that teriflunomide was in fact approved as an active ingredient in Arava. The district court granted summary judgment for the FDA, agreeing with the agency that Aubagio was entitled to exclusivity because teriflunomide had never previously been approved.
The DC Circuit affirmed the district court’s judgment. The court held that while Sandoz did not exhaust its statutory argument before the FDA, in the absence of a statutory or regulatory exhaustion requirement, the court found it appropriate to decide Sandoz’s challenge. When the FDA approves a new drug, it does not also “approve” known impurities in that drug for the purpose of new chemical entity exclusivity. And the record is clear the FDA did not approve teriflunomide as an active ingredient when it approved Arava. Aubagio was therefore entitled to new chemical entity exclusivity, and Sandoz cannot benefit from a solo exclusivity period for its generic equivalent.