Books about people who started using drugs in childhood?

A friend of mine is going through a tough time and I think it would be helpful for him to read about people who've gone through the same things. Memoirs and autobiographies are preferable but fiction would be fine too. He started using prescription meds when he was around 12, often given to him by his own parents. if anybody can recommend a book dealing with that or the fall out from it I think it would make him feel less alone.