How Safe Is Taking Intuniv 1mg Per Day For ADHD?

good afternoon. i have a 7 yr old son who is extremely hyper and cannot sit still however he is an A and B student going to 2nd grade now. The teacher has always complained about his inability to sit still and has suggested to get him checked for ADHD. I took him to a pediatric neurologist about 2 weeks ago where she tested him academically and said he was in fact very smart as i told her. She made me fill out a questionnaire and according to my answers she determined he had the ADHD symptoms. She prescribed intuniv 1mg per day which i gave him for 3 days but then stopped because i felt guilty as he was too calm for my liking. i did decide to give it to him again yesterday because i saw the jumping around was wayyy too much. Do you think this will beneficial for him once school starts so that he can be still and focused? and being that it is not a stimulant drug does that he mean that he can stop taking it at anytime without having to be weened off of it? and also is this something that he could possibly outgrow? i am confused because i do not want to damage his development with drugs but at the same time dont want to regret in the long run that his condition could have been controlled had i distributed the medication as prescribed.