Years later Freud described the situation in these terms: "A side interest, though it was a deep one, had led me in 1884 to obtain from Merck some of what was then the little-known alkaloid cocaine and to study its physiological action... I suggested, however, to my friend Köningstein, the ophthalmologist, that he should investigate the question of how far the anaesthetizing properties of cocaine were applicable in diseases of the eye" (1925d, pp. 14-15).
Ernest Jones (1953) reports that in 1884 Freud administered injections of cocaine to his friend Ernst von Fleischl in order to wean him off his morphine addiction and to ease his terrible trigeminal neuralgia.
One year later he observed that the massive doses of cocaine required by Fleischl had led to chronic intoxication.
Coca leaves and cocaine had been used in the Americas as stimulants to fight fatigue and hunger, but their use led to neurochemical and physiological effects as well as severe addiction problems.
The psychoanalytic interpretation therefore must direct itself to the uncovering and interpreting of their resurrection fantasies and thus lead them to give up living within a dead object or give up identifying with a dead person.
- Freud, Sigmund. (1925d). An autobiographical study. SE, 20: 1-74.