If he has been on 20mg for four years, he may need an increased dose. Dosages are adjusted according to weight, age and of course subjective feedback. Dosage should be assessed every six months.
From your post I am not sure how long this changed behaviour has been going on for. If it is a sudden change, it may not have anything to do with the Ritalin; any change in his life can cause an upset. Examples of changes include moving house, changing teachers, friend moving away etc. Although he is still a bit young, it may also be the beginnings of puberty.
If nothing has changed in his life, and he is consistently taking his medication (is this his own responsibility?) it may then be time to readdress his dose. Would you feel comfortable speaking with your neurologist's locum about this? If not, a letter from the locum, or even the hospital/medical rooms manager stating that the neurologist will be away until December will show the school that you are aware of the situation (obviously) and you are taking some action to rectify the matter. Hopefully the school will be understanding.
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