Both of these drugs can certainly produce unwanted side effects. The Concerta is being used to treat your grandson's suspected ADHD while the Risperdal is an anti-psychotic drug which cause agitation and anxiety.Why is he on Risperdal?
I am not at all sure that the correct diagnosis has been made here and that he has ADHD. It seems that his bizarre behaviour may have another cause entirely. Top of the list would be the question as to whether he has some form of the Autism syndrome or if he has a problem called Oppositional Defiant Disorder [ODD for short].Please read about this condition on Google [just put in 'ODD'] Other conditions such as temporal lobe epilepsy also have to be considered.
It is difficult to advise you where to begin, but a good starting point would be to see an experienced paediatric neurologist. It would be best to see a different specialist who will take a fresh approach to making a proper diagnosis.
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