In May, the Federal Trade Commission (FTC) required Hikma Pharmaceuticals PLC to divest its 23 percent interest in Unimark Remedies, Ltd. and its US marketing rights to a generic drug under manufacture by Unimark as a condition to allowing Hikma to complete its acquisition of Roxane Laboratories. The FTC was concerned that Hikma’s continued holding of a 23 percent interest in Unimark after consummation of its proposed acquisition of Roxane would create the incentive and ability for Hikma to eliminate future competition between Roxane and Hikma/Unimark in the sale of generic flecainide tablets (a drug used to treat abnormally fast heart rhythms) in the United States. The FTC’s divestiture requirement was unusual but not unprecedented. The Horizontal Merger Guidelines identify three theories of competitive harm associated with an acquisition or holding of a small but significant minority interest in a competitor. Minority ownership, and any associated rights,...

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