Data obtained by the Conservatives found more than 420,000 prescriptions were written for under-16s in 2007 - a rise of 33% on 2005 figures.
More than 40,000 prescriptions were also written for 16 to 18 year-olds, up 51% since 2005.
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Rise in number of children treated with hyperactivity drugs
More children are being treated with drugs to combat hyperactivity, new figures have revealed
