A mild form of amphetamine used in the treatment of
Ritalin, taken as a pill, also has been effective for the treatment of other conditions such as {{link=narcolepsy">narcolepsy . Although the drug acts as a stimulant in most people, Ritalin calms and focuses those with ADHD. Ritalin's mode of action is unknown, but it is thought that the drug reduces symptoms by increasing the amount and activity of a neurotransmitter in the brain.