West Virginia’s attorney general on April 4 urged a judge to hold Johnson & Johnson, Teva Pharmaceutical Industries Ltd., and AbbVie Inc.’s Allergen liable for causing a “tsunami” of opioid addiction in the state.

The U.S. Food and Drug Administration said it has approved the use of the painkiller OxyContin in children as young as 11, for severe pain that can’t be adequately treated […]