Bryan McDonel and his father, Mike, both served multiple tours in Iraq with the National Guard. Bryan was first prescribed painkillers before his deployment, and his dependence on medication prompted a downward spiral. Quil Lawrence/NPR hide caption

itoggle caption Quil Lawrence/NPR

Several states distribute Naloxone hydrochloride, also called Narcan, to treat opium-based drug overdoses. But only one company manufactures the drug, and the price has spiked in recent years. Toby Talbot/AP hide caption

itoggle caption Toby Talbot/AP