Isolated from opium by the German chemist F. W. A. Sertürner around 1804, morphine (named after Morpheus, the Greek god of sleep and dreams) was used to treat opium addicts. Invented by Bayer Pharmaceuticals in 1898, heroin (derived from the Greek word for hero) was used to treat morphine addicts.

“I have absolutely no pleasure in the stimulants in which I sometimes so madly indulge. It has not been in the pursuit of pleasure that I have periled life and reputation and reason. It has been in the desperate attempt to escape from torturing memories,” wrote Edgar Allan Poe in a letter in the last year of his life.