In a pair of hefty opinions, a federal judge has certified class action antitrust claims against pharmaceutical giant GlaxoSmithKline, maker of the wildly popular antidepressant drug Wellbutrin XL, for allegedly using sham patent suits to delay generic versions of the drug from making their way to the market.

In her two opinions in In re Wellbutrin XL Antitrust Litigation , U.S. District Judge Mary A. McLaughlin certified a class of direct purchasers and a class of indirect purchasers.