Synthetic stimulant, known as speed. 
Used since World War II to help
soldiers overcome fatigue, and until the
1970s prescribed by doctors as an appetite
suppressant for weight loss; as an
antidepressant, to induce euphoria; and as a
stimulant, to increase alertness. Indications
for its use today are very restricted because
of severe side effects, including addiction
and distorted behaviour. It is a sulphate or
phosphate form of C9H13N.