i developped a high tolerence on Ritalin which was perscribed to me after the late detection of ADHD at the age of thirty, so i increased the doses without consulting with my doctor, and today, for example, i took so far 22 pills (220 milligrams) and had 4 cans of beer. how come i didn't overdose yet and why is the effect of ritalin wearing out less than one hour?