Nearly a quarter of people on long

By Sam Hornblower, Bloomberg News

More than one in five people prescribed extended-release painkillers such as OxyContin developed an addiction within a year, according to a newly released study mandated by the U.S. Food and Drug Administration.

The study, repeatedly delayed by more than a decade and released Monday, revealed a far higher percentage of pain patients addicted to opioids than drugmakers’ sales reps claimed in their marketing materials and representations to physicians.

The FDA now faces the question of how to use this data to evaluate whether the agency should make changes to opioid regulation, limiting broad approvals of long-acting opioids for extended use. The FDA is currently holding hearings to discuss the findings and is being asked by advocates to change the drugs’