Abstract
Psychostimulant drugs are characterized by the fact that they increase psychic and motor activity. This class of drug includes cocaine, amphetamine (and its derivates) and xantines (caffeine, teobromine, and teophiline). Caffeine is the most widely consumed behaviorally active substance in the world. Cocaine and amphetamine are illicit drugs, but, in Brazil, the fenproporex (an amphetamin…