ST. PAUL - The Minnesota Board of Pharmacy and Attorney General Lori Swanson have sued Arizona-based Insys Therapeutics, alleging it illegally markets a fentanyl painkiller.

The suit filed Wednesday, May 30, claims the company allowed fentanyl, an opioid it sells, to be used for conditions not approved by the federal Food and Drug Administration and in higher doses than allowed. It is only approved for pain in some cancer patients.

Attorney General Lori Swanson said the opioid painkiller is 100 times more powerful than morphine. A U.S. Centers for Disease Control and Prevention study found a 70 percent increase in overdose cases in Midwestern emergency rooms from July 2016 to September 2017.