Pharmacy giant Walgreens has agreed to pay up to $350 million in a settlement with the U.S. Department of Justice, which had issued a claim over opioid prescriptions.

The company then sought payment for many of those prescriptions from Medicare and other federal health care programs in violation of the False Claims Act, the announcement said.

Walgreens has agreed to pay up to $350 million in a settlement with the U.S. Department of Justice, who accused the pharmacy of illegally filling millions of prescriptions in the last decade for opioids and other controlled substances.