Second and third week he was great, teacher was very happy said he is now focused and paying attention no running around and touching everything. Now week four, seems like he has become immune or resistant, he is back to his regular over active impulsive nonstop talking self. Teacher says it looks as if he hasn't taken his capvay at all. Is it possible that he is now grown imune to the milligrams? Might the fact that he only takes one dosage in the morning be to blame? Would giving twice a day help? I'm very confused.