Focalin
Dexmethylphenidate (commercially known as Focalin) is a pharmaceutical drug used to treat Attention Deficit Hyperactivity Disorder. It is very similar to Ritalin, but it only contains the d-isomer of methylphenidate. It is a stimulant that affects the central nervous system. Dexmethylphenidate is a short acting drug, its half-life usually being between four and six hours.