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Amphetamine (contracted from alpha-methylphenethylamine) is a central nervous system (CNS) stimulant that is used in the treatment of attention deficit hyperactivity disorder (ADHD), narcolepsy, and obesity. Two enantiomers of amphetamine exist: [note 3] dextroamphetamine (found in 1887). Amphetamine refers to a particular chemical, the racemic unbound. This chemical is made up of equal parts of both the enantiomers levoamphetamine (and dextroamphetamine) in their pure amine forms. Informally, the term can be used to describe any combination of the Enantiomers or just one of them. It has been used historically to treat depression and nasal congestion. It is used to treat nasal congestion and depression. Because of the serious health risks associated with recreational usage, it is a prescribed drug.