David Carter & Sigmund Freud 
On Cocaine [PDF ebook] 

Finding cocaine to be an analgesic and a cure for depression, Freud hailed it as a miracle drug, stressing in particular its apparent lack of side effects. Marveling at its ability to "cure" addictions to morphine, he enthusiastically recommended it to all his acquaintances. Eventually, following several tragic experiences, he was forced to recognize the negative effects of the drug. This unique selection, edited and translated by Freud expert David Carter, combines letters, papers, and dream analyses on cocaine, bringing together the contentious thoughts of one of the 20th-century’s most brilliant minds.