It has long been known that psychostimulant drugs have the paradoxical effect of reducing hyperactivity. [Psychostimulant drugs include methylphenidate - known by the trade names Ritalin, Concerta, and Methylin - and methamphetamine]. Since the mid-1950s, sea of nativity and adults have been prescribed stimulant medications to control regardfulness deficit hyperactivity disorganize (ADHD). But for more than seven decades, since the first rehearsal that gave an amphetamine drug to nativity diagnosed with behavioral problems, scientists have not known how stimulants work to control hyperactivity...

More: - From the site