Spending on drugs to treat children and adolescents for behavior-related disorders rose 77 percent from 2000 to the end of 2003, according to a study of prescription purchases by Medco Health Solutions, a pharmacy benefits management company. The increase, to $536 a patient a year on average, reflected rising prices as growing numbers of young people used newer and more expensive drugs, said Robert S. Epstein, chief medical officer of Medco. The report is to be released today. Sales of the behavioral drugs are growing faster than any other type of medicine taken by children, pulling ahead of the previous...