Much like cocaine, heroin is illegal another drug that was used for medical purposes. Back in 1895, Bayer Pharmaceutical Products used heroin-hydrochloride in elixirs, drops, lozenges, balsams and other types of medicine to treat bronchitis, whooping cough, pulmonary tuberculosis, and other respiratory ailments. As the ad suggested, it was “The Cheapest Specific for the Relief of Coughs,” so it must have been true right? These days, heroin is considered one of the most addictive and fatal drugs you can use, and yet surprisingly, some countries still use it for the treatment of pain.