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Impax Laboratories, Inc., In the Matter of

The FTC's administrative complaint against Impax charges that in 2010, Impax and Endo Pharmaceuticals Inc. illegally agreed that Impax would not compete by marketing a generic version of Endo’s Opana ER until January 2013. In exchange, Endo paid Impax more than $112 million.

Endo agreed to settle these charges in a stipulated order entered in federal court. See FTC v. Allergan plc, and Watson Laboratories, Inc. et al.

The Commission’s 2019 opinion held that the FTC staff had proven that the agreement between Impax and Endo Pharmaceuticals Inc. violated Section 5 of the Federal Trade Commission Act. The Commission’s opinion reversed Chief Administrative Law Judge D. Michael Chappell’s initial decision.

In April 2021, the U.S. Court of Appeals for the Fifth Circuit upheld the Commission’s opinion.

Type of Action
Last Updated
FTC Matter/File Number
141 0004
Docket Number
Case Status

Endo Pharmaceuticals Inc./Amneal Pharmaceuticals, Inc.

The FTC is suing Endo Pharmaceuticals, Inc., Endo International plc, Impax Laboratories, LLC, and Impax’s owner, Amneal Pharmaceuticals, Inc., alleging that a 2017 agreement between Endo and Impax violated the antitrust laws by eliminating competition in the market for oxymorphone ER. The complaint charges the defendants with violating Sections 1 and 2 of the Sherman Act, which constitutes unfair methods of competition in violation of Section 5 of the FTC Act. Specifically, Endo, Impax, and Amneal are charged with entering into an illegal agreement in restraint of trade, and Amneal is charged with monopolization of the oxymorphone ER market. The complaint was filed in the U.S. District Court for the District of Columbia on Jan. 25, 2021.

Type of Action
Last Updated
FTC Matter/File Number