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New data on long-term drug therapies for hyperactive children link the commonly prescribed medications with stunted growth -- a result doctors have suspected for years, but may not have properly reported, sources say.

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The new data are related to a scientific study of children with attention-deficit hyperactivity disorder (ADHD), known as the MTA study.

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When first released in 1999, the study�s glowing conclusions about the benefits of medications such as Adderall and Concerta helped spark a rapid increase in the number of prescriptions being issued for children.

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By 2004, doctors were writing 28.3 million ADHD prescriptions per year. By last year, according to a report in the Washington Post, that number had increased to 39.5 million annually.

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One finding that has been scientifically verified: A 2007 follow-up review showed that children taking the drugs for three years were approximately six pounds lighter and 1 inch shorter than children with the same malady who did not take the drugs.

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Moreover, there are no observable difference between children who have been given the drugs and those who have not -- suggesting the drugs� benefits may be temporary. Doctors warn that patients should not cease taking prescribed medications without consulting their physician.

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It also warned of psychological addiction and a potential for drug abuse, however. And it reported that in many states possession of the drugs without a prescription is a felony.

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