Case Status
Case Caption
In re: Lantus Direct Purchaser Antitrust Litigation
U.S. District Court for the District of Massachusetts
Case Number
Sanofi-Aventis U.S. LLC
File Date

In 2017, Hagens Berman filed a federal antitrust class action on behalf of a class of direct purchaser plaintiffs against Sanofi alleging the company engaged in a multifaceted scheme to unlawfully extend its monopoly over its multibillion-dollar per-year injectable insulin glargine product, Lantus.

At the center of that scheme, the suit alleges, is Sanofi’s decision to improperly submit more than two dozen patents claiming mechanical aspects of an injection pen in the FDA’s Orange Book—a list in which only patents claiming a drug or a method of using a drug may be listed. The complaint alleges that this enabled Sanofi to sue would-be competitors over those ineligible pen patents, securing a 30-month delay in the FDA’s ability to approve competing products.  

The direct purchasers allege Sanofi did this solely for the purpose of delaying the availability of affordable alternatives to Sanofi’s expensive Lantus product, forcing purchasers to pay hundreds of millions of dollars, if not billions, more for life-saving insulin.


Case Returned to District Court

Although the district court initially dismissed the case, in February 2020, the direct purchasers secured a victory on appeal. The First Circuit Court of Appeals held that Sanofi had improperly submitted its pen patent for listing in the Orange Book and, accordingly, the company is potentially liable under the antitrust laws.

The case has been returned to the district court to proceed into discovery and toward trial.

Hagens Berman purchases advertisements on search engines, social media sites and other websites. Transmission of the information contained or available through this website is not intended to create, and receipt does not constitute, an attorney-client relationship. If you seek legal advice or representation by Hagens Berman, you must first enter a formal agreement. All information contained in any transmission is confidential and Hagens Berman agrees to protect information against unauthorized use, publication or disclosure. This site is regulated by the Washington Rules of Professional Conduct.