Diphenhydramine, known as the primary ingredient in Benadryl in the United states, and Unisom in various international countries, is a class 1 antihistamine. It was released in 1946 from a Cincinnati chemist. Although used for sleep and allergy relief, it is now a cheap recreational drug. If injected in some form, usually is a hydrochloric solution, it can give the user a unique high. Due to the extreme danger and toxicity of this, some countries have either controlled the drug, or banned it. Once such country in Africa, The Republic of Zambia, discourages tourists from bringing it into the country, and many have faced criminal offences for having it on their person.