Proof of Superflys claims.
"Health Effects
Methylphenidate is a central nervous system (CNS) stimulant. It has effects similar to, but more potent than, caffeine and less potent than amphetamines. It has a notably calming and “focusingà€ effect on those with ADHD, particularly children.
Recent research at Brookhaven National Laboratory may begin to explain how methylphenidate helps people with ADHD. The researchers used positron emission tomography (PETâ€â€Âa noninvasive brain scan) to confirm that administering normal therapeutic doses of methylphenidate to healthy, adult men increased their dopamine levels. The researchers speculate that methylphenidate amplifies the release of dopamine, a neurotransmitter, thereby improving attention and focus in individuals who have dopamine signals that are weak.1
Methylphenidate can be a valuable medicine, for adults as well as children with ADHD.2,3,4 Treatment of ADHD with stimulants such as Ritalin and psychotherapy help to improve the abnormal behaviors of ADHD, as well as the self-esteem, cognition, and social and family function of the patient.2 Research shows that individuals with ADHD do not become addicted to stimulant medications when taken in the form and dosage prescribed by doctors. In fact, it has been reported that stimulant therapy in childhood is associated with a reduction in the risk for subsequent
drug and alcohol abuse disorders.5,6 Also, studies have found that individuals with ADHD who have been treated with stimulants such as methylphenidate are significantly less likely than those who do not receive treatment to abuse
drugs and alcohol when they are older.7
Because of its stimulant properties, however, in recent years there have been reports of methylphenidate abuse by people for whom it is not prescribed. It is abused for its stimulant effects: appetite suppression, wakefulness, increased focus/attentiveness, and euphoria. Addiction to methylphenidate seems to occur when it induces rapid increases of dopamine in the brain. In contrast, the therapeutic effect is achieved by slow and steady increases of dopamine, which are similar to the natural production by the brain. The doses prescribed by physicians start low and increase slowly until a therapeutic effect is reached. That way, the risk of addiction is very small.8
When abused, the tablets are either taken orally or crushed and snorted. Some abusers dissolve the tablets in water and inject the mixture; complications can arise from this because insoluble fillers in the tablets can block small blood vessels."
http://www.nida.nih.gov/Infofacts/Ritalin.html