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Stimulants are a class of medications that boost the actions of norepinephrine and dopamine in the central nervous system. They serve to increase one's energy, concentration, altertness, wakefulness, drive, motivation, and interest.

In psychiatry, these medications are used mostly for treating Attention-Deficit/ Hyperactivity Disorder (ADHD), Narcolepsy, and for augmenting the effects of antidepressants in treating Depression.

The two main kinds of stimulants currently in use are Methylphenidate and the amphetamines. Each of these are available in various different forms.

These medications are sometimes abused and can lead to addictions, though this tends to be rare when they are being used for treating bone fide psychiatric disorders and under proper medical supervision. It is generally advised that these medications be used with caution in people who have a past history of substance abuse or dependence.