Concerta and Ritalin are both stimulants and have similar side effects; you can speak to your prescribing doctor about whether or not your son is a candidate for Stratterra which is a non-stimulant. It has to build up in the system for two weeks or so and as a result the effects are not immediate as with Concerta.
Please remember the medication is intended to improve concentration, which in many cases does help the disruptive behaviour. However, there are instances where children have to be taught the correct behaviours. You may find that due to poor concentration in the past, he missed the rules of the classroom and now is behaving according to habit, rather than the rules.
It is also possible that children misbehave when they are trying to avoid a task because they perceive it as too difficult / boring. In this instance he needs the social skills to rather ask for help.
Treatment of ADHD is not intended to be by medication alone: personal factors such as diet and sleep as well as social behaviours must be addressed as well.
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