British singer Lily Allen's little brother Alfie was once prescribed Ritalin to treat his hyperactivity - but quit taking the drug after it crushed his identity. The Atonement star was diagnosed with Attention-Deficit Hyperactivity Disorder (ADHD) as a young child and was one of the first children in the U.K. to be medicated with the calming pill. But the drug had such a dramatic effect on his demeanour, his mother could no longer recognise his personality. He says, "I did have a problem concentration on anything for more than 10 seconds. I was one of the first kids in the U.K. to go on Ritalin and my mum hated it and I hated it. "We went to Ibiza and I was on Ritalin and for a kid who couldn't concentrate, I read a 200-page book on King Arthur and my mom just hated it. She said it just wasn't me."