Phencyclidine, commonly known as PCP, is a dissociative anesthetic that was originally developed in the 1950s for use in medical settings. It alters perception, mood, and consciousness, leading to feelings of detachment from the body and environment. Due to its unpredictable effects, it is no longer used in humans but is sometimes found as a recreational drug. PCP can cause a range of effects, including hallucinations, agitation, and impaired motor function. It is often associated with dangerous behaviors and can lead to severe psychological distress. The drug is classified as a Schedule II controlled substance in the United States, indicating its high potential for abuse.