A diagnosis of ADHD need not be made by a psychologist; a neurologist or psychiatrist can do as well and I assume one of these who provided the diagnosis for your son? If not, and he was diagnosed as "hyperactive" not ADD or ADHD, I urge you to have him re-assessed by one of the three professionals mentioned.
I am not sure from your post which medications you give him once or twice a month, however, please note that Risperdal should definitely not be taken in this ad-hoc fashion. There is also very little benefit in giving the Ritalin at such intervals as the effectiveness wears off after a few hours. Please speak with your prescribing professional sooner rather than later regarding the manner in which he has been receiving his medications and discuss a way forward.
I am also unsure from your post when the diagnosis and prescription was initially made; if it was at age 3, it was quite a strong measure to start him on Risperdal and Ritalin. Furthermore, these dosages should be monitored every six months or so and the doctor should have been made aware that he was taking the medications once or twice a month.
If he is struggling at school, having him assessed by an educational psychologist may provide some insight as to why he is battling.
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