My Son Has Been Detected With ADHD But At The

My son has been detected with ADHD but at the same time his IQ is also very high (132 in WHISK 4), he is suffering from lack of concentration and some behavioural problems. Day by day he is becoming aggressive along with occasional hyperactivity. Doctor has prescribed him Axepta(Attentrol) 10mg once in a day and RisdoneMT at bed time. He is 13 and half years old. But after taking medication on very first day he is feeling sleepy. Even he got slept at the class today. Can anyone please suggest anything?