Your son has effectively done very well on the Concerta plus a 5mg Ritalin booster in the afternoon. The Concerta seems to be wearing off by 4pm. Why not just increase the Ritalin in the afternoon to 10mg. He does not have tha main side effect of Ritalin which is appetite suppression,so he should be OK on a bigger afternoon dose. It would be better to do this than to double the dose of Concerta.
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