Benzedrine is the trade name of the racemic mixture of amphetamine (dl-amphetamine). The drug was often referred to as "bennies" by users and in literature. It was marketed under this brand name in the United States by Smith, Kline & French in the form of inhalers, starting in 1933. Benzedrine was used medically to enlarge nasal and bronchial passages until it was discontinued and replaced with compounds with weaker psychoactive properties (e.g., ephedrine, levomethamphetamine, and propylhexedrine).
While the drug was initially used for medical purposes, as a bronchodilator, early users of the Benzedrine inhaler discovered it had a euphoric stimulant effect, resulting in its being one of the earliest synthetic stimulants to be widely used for recreational (i.e., nonmedical) purposes. Even though this drug was intended for inhalation, some people used Benzedrine recreationally by cracking the container open and swallowing the paper strip inside, which was covered in Benzedrine. The strips were often rolled into small balls and swallowed, or taken with coffee or alcohol. Because of the stimulant side effect, physicians discovered amphetamine could also be used to treat narcolepsy. This led to the production of Benzedrine in tablet form. Benzedrine was also used by doctors to perk up lethargic patients before breakfast.
In 1937, the effects of Benzedrine, and thus stimulant use, was studied in children with behavior and neurological disorders.
Benzedrine was supplied to combat troops in World War 2 for use in exceptional circumstances (e.g. to keep escort ship officers awake and alert in continuous pursuit of submarines for 24 hours or more) as is documented by some participants, e.g. Nicholas Monsarrat. In the 1940s and 1950s, reports began to emerge about the recreational use of Benzedrine inhalers, and in 1949, doctors began to move away from prescribing Benzedrine as a bronchodilator and appetite suppressant. In 1959, the United States Food and Drug Administration (FDA) made it a prescription drug. After its removal from open sale a black market continued in many large cities, to supply addicts and enthusiasts. For example, the working day at some carnivals (e.g. Labour Day at the Canadian National Exhibition, Toronto, in 1960) was 12 to 16 hours long, enabled by standard dose Benzedrine tablets, still available surreptitiously.