May 17, 2023
FTC uses novel antitrust theory against Amgen-Horizon merger
The agency’s objection is not the same as the usual policy concerns concerning mergers. Instead, the FTC worries that Amgen will offer rebates on two blockbuster Horizon drugs, used to treat thyroid eye disease and chronic refractory gout, to keep competitors out of the marketplace.




The U.S. Federal Trade Commission’s attempt, announced Tuesday, to block California-based Amgen Inc.’s acquisition of Horizon Therapeutics PLC rests on a novel antitrust theory to prevent large companies from bundling pharmaceutical drugs, legal experts say.
The agency’s objection is not the same as the usual policy concerns concerning mergers. Instead, the FTC worries that Amgen will offer rebates on two blockbuster Horizon drugs, used to...
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