PCP was originally developed in 1926 and patented in 1952 as an anesthetic with the scientific name piperidinocychlohexanecarbonitrile. It was tested on animals before being used on humans, and was classified as an anesthetic after the Parke-Davis company tested it on humans and brought it to the federal government. PCP has legal pharmaceutical uses but is also an illegal recreational drug known by nicknames like "Angel Dust" and "Embalming Fluid." Short term effects include changes in body awareness and hallucinations, while long term risks are addiction and craving. Treatment for PCP users often occurs in emergency rooms.