The toll from soaring rates of prescription drug abuse, including both psychiatric medications and drugs for pain, has begun to dwarf that of the usual illegal culprits. Hospitalizations related to prescription drugs are up fivefold in the last decade, and overdose deaths up fourfold. More high school seniors report recreational use of tranquilizers or prescription narcotics, like OxyContin and Vicodin, than heroin and cocaine combined.

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http://www.nytimes.com/2011/06/14/science/14volkow.html?_r=1&hp