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The drug Ritalin was originally used as a stimulant for adults - until researchers discovered it could help children concentrate. It's now taken by millions of patients around the world to treat Attention Deficit Hyperactivity Disorder or ADHD.

Witness speaks to Dr C Keith Conners, one of the researchers behind the first randomised clinical trial of Ritalin on children in 1964.

PICTURE: Ritalin blister-packs and packet. Ritalin is a proprietary brand of Novartis Pharmaceuticals. Copyright Science Photo Library.