The prescription painkiller sold under the brand-name Vicodin contains hydrocodone bitartrate and acetaminophen. To reduce the risk of liver damage, the Food and Drug Administration is moving to limit the amount of acetaminophen allowed in prescription medicines. Toby Talbot/AP hide caption

itoggle caption Toby Talbot/AP

A brain that can let other thoughts bubble up despite being in pain might help its owner benefit from meditation or other cognitive therapies. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Drug overdose deaths have more than tripled in the U.S. since 1990. Opioid painkillers like OxyContin are the cause of three-quarters of those deaths. Toby Talbot/Associated Press hide caption

itoggle caption Toby Talbot/Associated Press

The painkiller diclofenac is sold under several brand names in the U.S. and abroad, including Voltaren. Wikimedia Commons hide caption

itoggle caption Wikimedia Commons

Carolyn Tuft and her daughter Kirsten (seen here in 2005) were the victims of a shooting at a Salt Lake City mall in 2007. Kirsten was one of five bystanders killed, and Carolyn was left in severe pain. Courtesy of Carolyn Tuft hide caption

itoggle caption Courtesy of Carolyn Tuft