With patent extension up for grabs, Shire agrees to test Vyvanse in preschoolers

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To hear Shire tell it, there aren't many adequate and well-controlled drug studies in preschool-aged children with ADHD. But never fear, the company says: It's agreed to a written request by the FDA to investigate its ADHD drug Vyvanse in children aged 4 to 5, with a potential 6-month exclusivity boost for the drug on the line.