I have never seen a chart. I think the reason is that, "The specific dose and timing of medication must be determined for each individual. However, there are no consistent relationships between height, age and clinical response to a medication. A medication trial is often used to determine the most beneficial dosage. The trial usually begins with a low dose that is gradually increased at 3-7 day intervals until clinical benefits are achieved. It is common for the dosage to be raised several times during the trial." from - http://www.help4adhd.org/en/treatment/medication/WWK3
I have seen limits on upper and lower boundaries, but I have also seen where these have been exceeded. Everything I have read says its pretty much trial and error as everybody is different. Also the different stim meds have different reactions - so while one may not work, another will.
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