My son has adhd and had tummy bug recently. he is on neucon and rispricor for the adhd. he complains about his body itching since yesterday even though there is nothing?

The are several possibilities to the itching that your son is experiencing. If these medications, Neucon and Rispricor(sp?) maybe Risperdal, are relatively new, one would consider the possibility of a side effect from the medication. The tummy bug that you describe could also be a culprit even if there is no rash. If this itching has been persistent, it would be best to seek medical care.