The stimulation caused by amphetamines is caused by excessive
release of norepinephrine from storage sites in the peripheral
nervous system. It is not known whether the same action occurs
in the central nervous system. Two other theories for their action
are that they are degraded slower than norepinephrine or that
they could act on serotonin receptor sites.
Therapeutic doses of amphetamine elevate mood, reduce feelings
of fatigue and hunger, facilitate powers of concentration, and
increase the desire and capacity to carry out work. They induce
exhilarating feelings of power, strength, energy, self-assertion,
focus and enhanced motivation. The need to sleep or eat is diminished.
Levoamphetamine (Benzedrine), dextroamphetamine (Dexedrine),
and methamphetamine (Methedrine) are collectively referred to
Benzedrine is a mixture of both the dextro and levoamphetamine
isomers. The dextro isomer is several times more potent than
the levo isomer.
The misuse and abuse of amphetamines is a significant problem
which may include the house wife taking diet pills, athletes
desiring an improved performance, the truck driver driving non-stop
coast to-coast, or a student cramming all night for an exam.
Link to Amphetamines.com