Unfortunately these medicines work by decreasing impulsive behaviour, which in turn improves concentration. This may however cause the overwhelming tiredness you describe in your son. My first suggestion is that you contact your prescribing doctor and discuss the situation with him, and perhaps you can find alternatives. If you are still not happy there are a number of medication-free alternatives that you could try that also work very well to improve all the symptoms associated with this condition. These can be accessed through a google search.
Dr Peter Velloza
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