The US Drug Enforcement Administration classifies Ritalin and other ADHD drugs in the same class of highly addictive drugs as cocaine, mophine and opium—Schedule ll drugs, with the highest potential for abuse. In addition, 31 drug regulatory warnings and 20 studies have confirmed that ADHD drugs such as Ritalin, Adderall and Concerta, prescribed to 5 million American children, can cause heart problems, stunted growth, drug dependence, suicide, violence, depression, mania, psychosis, hallucinations and death.