Emergency room visits associated with the use of stimulants such as Ritalin and Adderall among 18- to 34-year-olds increased from 5,600 in 2005 to 23,000 in 2011, according to data released Thursday by the Substance Abuse and Mental Health Services Administration. The increase is part of a wider pattern of prescription drug abuse, said Peter J. Delany, head of the office that monitors statistics for SAMHSA.

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