David Cohen 
Freud on Coke [PDF ebook] 

The story of Freud’s involvement with cocaine and how it affected research long after he died… The book tells of a number of drug related tragedies Freud was involved in including the death of Ernest Fleischl and that of the less well known Otto Gross who was a good analyst, a cocaine addict and has advanced ideas about sex which led him to founding an orgiastic commune in Italy. Freud devotees will be unhappy with the book because it depicts their hero as all too human but it is a balanced view!