FTC Again Charges Endo and Impax with Illegally Preventing Competition in U.S. Market for Oxymorphone ER

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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 FTC sued Endo and Impax in January 2017 for engaging in similar anticompetitive conduct concerning the same drug product.

“The agreement between Endo and Impax has eliminated the incentive for competition, which drives affordable prices,” said Gail Levine, Deputy Director of the Bureau of Competition at the FTC. “By keeping competitors off the market, the agreement lets Impax continue to charge monopoly prices while Endo and Impax split the monopoly profits. Today’s lawsuit is the latest demonstration of the FTC’s longstanding commitment to stopping anticompetitive conduct in the pharmaceutical industry.” 

According to the complaint, Endo’s Opana ER (oxymorphone extended release) product, a long-acting opioid indicated for the treatment of moderate to severe pain, generated nearly $160 million in revenues in 2016 alone. In June 2017, the FDA asked Endo to voluntarily withdraw its drug from the market because of safety concerns about the reformulated version of Opana ER that Endo launched in 2012. The FDA’s safety concerns were informed by data indicating that Endo’s reformulated Opana ER resulted in increased intravenous abuse, according to the complaint. The withdrawal of Endo’s drug left Impax’s generic version of the original formulation of Opana ER as the only extended-release oxymorphone drug on the market.

After deciding to withdraw its reformulated Opana ER, Endo explored bringing another oxymorphone ER drug to the market or partnering with a third-party generic company as a way to replace its Opana ER revenues. But ultimately, the FTC alleges, Endo reached an agreement in August 2017 with Impax, the only other authorized seller of an oxymorphone ER product. The agreement eliminated potential competition from Endo by sharing Impax’s monopoly profits, with Endo in the role of a potential entrant paid to stay out of the market. This agreement allowed Impax to exercise and maintain monopoly power in the market for FDA-approved oxymorphone ER tablets, according to the complaint.

The 2017 agreement between Endo and Impax arose from a breach of contract case relating to a 2010 patent settlement between the companies over Impax’s generic of the original version of Opana ER, in which Endo paid Impax more than $112 million not to compete. The FTC previously found that the 2010 agreement between Endo and Impax was an illegal reverse-payment settlement. The 2017 agreement was made during the pendency of the FTC’s litigation over the 2010 agreement. The Commission’s decision in the matter of the 2010 agreement is currently on appeal.

In addition to Endo and Impax, the complaint names Amneal Pharmaceuticals, Inc., which now owns Impax. 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 seeks monetary relief, injunctive relief to undo the ongoing competitive effects from this agreement, and a permanent injunction to prohibit Endo, Impax, and Amneal from engaging in similar conduct in the future.

The Commission vote to file the complaint was 3-2, with Commissioners Noah Joshua Phillips and Christine S. Wilson voting no. The complaint was filed in the U.S. District Court for the District of Columbia on Jan. 25, 2021.

Contact Information

Media Contact: 
Office of Public Affairs
202-326-3707
Staff Contact: 
Eric M. Sprague
Bureau of Competition Bureau of Competition
202-326-2101