As a step-up to the ongoing probe by the anti-trust department of the US Department of Justice (DoJ), initiated in October 2014, on the sharp increases in prices of certain generic drugs in the US and the possibility of cartelisation among the drug makers, 20 US States filed a lawsuit on December 15, 2016 against six pharmaceutical companies – Aurobindo Pharmaceuticals Limited, Citron Pharma LLC, Heritage Pharmaceuticals Inc., Mayne Pharma, Mylan NV and Teva Pharmaceuticals. The lawsuit alleges these companies for conspiring the prices of two generic drugs –Doxycycline Hyclate (an anti-biotic) and Glyburide (an anti-diabetic drug).