The 3rd U.S. Circuit Court of Appeals has tossed out a Delaware pharmaceutical company’s antitrust suit in which it claimed Pennsylvania and Tennessee drugmakers conspired to drive up the price of generic versions of brand-name muscle relaxant Skelaxin.

The appeals court affirmed U.S. District Court for the Eastern District of Pennsylvania Judge Cynthia M. Rufe’s ruling, in which she had dismissed the suit for lack of standing.