“Before studying imipramine, [Donald] Klein had worked with drug addicts, and he noticed that addicts had distinct preferences. Those who favored morphine could generally be distinguished from those who favored cocaine or amphetamine. And though both types of drugs give a rush of pleasure, the eventual effects are different. Opiates satiate an addict, at least while they remain effective. Cocaine and amphetamine do not satiate but, rather, excite further desire; stimulant addicts will tend to "go on a run" and rapidly use all the drug at their disposal. To Klein, these varieties of pharmacologic pleasure-seeking corresponded to varieties of ordinary enjoyment. Some pleasures, like eating a big meal or sexual orgasm, are satiating and do accord with Freud's concept of excitation reduction. But others, like "foraging, hunting, searching, and socializing," or sexual foreplay, are excitatory. Klein labeled these two sorts of pleasure "consummatory" and"appetitive.” AddictionNarcoticsStimulantsSatietyAnti Depressants Book:Listening to Prozac Source: Listening to Prozac
