DEERFIELD, Ill. (AP) — The U.S. Justice Department is accusing Walgreens of filling millions of prescriptions in the last decade and more without a legitimate purpose, including for dangerous amounts of opioids, according to a lawsuit filed this week.

The U.S. Justice Department on Friday accused pharmacy chain operator Walgreens Boots Alliance of contributing to the U.S. opioid epidemic by filling millions of unlawful prescriptions for addictive painkillers and other drugs.

The U.S. Department of Justice has filed a lawsuit against Walgreens Boots Alliance (NASDAQ:WBA) in Illinois federal court for dispensing millions of unlawful prescriptions over a 12-year period, driving Walgreens (NASDAQ:WBA) shares sharply lower in after-hours trading.