I'd like to know what doses of Focalin IR have been successful for treatment, especially for those who have a history of high and quick building tolerance issues.

(I've been working with my doctor for about 2 years trying to find a stimulant that works stably. So far, I've tried many different types, families, and doses that my liver processes too quickly and build a tolerance to within days)

Also, what have been the maximum doses others have taken and what doses are considered dangerous/overdose so I can make sure I can safely attempt to find a stable therapeutic dosage without overdoing it.

Thanks in advance!