According to this recent John Hopkins study, ADHD medications offer little help to reduce ADHD behaviors when used over longer periods of time. The article concludes, "we clearly need better interventions", and that is why I recommend nurturing your child's self-reliance and cooperation.
http://www.theatlantic.com/health/archive/2013/02/study-adhd-persists-despite-medication-in-9-out-of-10-kids/273097/
http://www.theatlantic.com/health/archive/2013/02/study-adhd-persists-despite-medication-in-9-out-of-10-kids/273097/