son had bad behaviour at early puberty was put on risperdal,has been on it 13years,now when something is not right for him(we have to guess what) he will hit the nearest person very hard,not good he is 24yrs and over 6feet tall i think he should come off risperdal as its not doing anything for him,would he be better without medicine,i think his behaviour is caused by hormones or his natural chemicals,please,we need an answer,thank you.