Amphetamine is a potent central nervous system stimulant that is used in the treatment of attention deficit hyperactivity disorder and narcolepsy

Gives user feelings such as an enhanced feeling of wakefulness and focus, and in many cases a reduced appetite

Enhance the synaptic activity of dopamine, serotonin, norepinephrine 

An example of a prescribed amphetamine is Adderall or Dexedrine.

Some long term effects of amphetamine use are increased anxiety, insomnia, increased restlessness, hallucinations, tremors, weight loss, and aggressiveness

What are Amphetamines?