The U.S. Justice Department has filed a lawsuit accusing Walgreens of filling millions of prescriptions for Americans over the last decade and more without a legitimate purpose, including for dangerous amounts of opioids.

The Department of Justice sued pharmacy giant Walgreens for allegedly dispensing millions of unlawful prescriptions. Walgreens from August 2012 until the present "knowingly" filled those prescriptions, which "lacked a legitimate medical purpose, were not valid, and/or were not issued in the usual course of professional practice," the DOJ said.