The bulk of the collusive activity occurred from July 2013 to January 2015, according to the complaint, when Teva raised prices on nearly 400 formulations of 112 generic drugs. A key element of the scheme, the complaint alleges, was an agreement among competitors to cooperate on pricing so each company could maintain a “fair share” of the generic drug markets. At the same time, the companies colluded to raise prices on as many drugs as possible, according to the complaint.

Though the complaint paints Teva Pharmaceuticals USA, which is based in Pennsylvania, as a leader in the conspiracy, it describes the conduct as “pervasive and industrywide.”

“Rather than enter a particular generic drug market by competing on price in order to gain market share,” the complaint states, “competitors in the generic drug industry would systematically and routinely communicate with one another directly, divvy up customers to create an artificial equilibrium in the market, and then maintain anticompetitively high prices.”

Teva denied the allegations. “Teva continues to review the issue internally and has not engaged in any conduct that would lead to civil or criminal liability,” the company said in a statement.

The Israeli drugmaker Teva Pharmaceutical Industries is one of the world’s largest manufacturers of generic medicines. The company faced criticism in February 2018 for charging $18,375 for a bottle of 100 pills for a rare medical condition known as Wilson disease. Mylan has also generated outrage for raising the price for a two-injection EpiPen set to over $600 from $100. The latest lawsuit comes as drug companies are already facing widespread scrutiny from lawmakers over drug prices.