PCP can produce violent or bizarre behavior in people who are not normally that way. Regular PCP use affects memory, perception, concentration, and judgment. Users may show signs of paranoia, fearfulness, and anxiety. During these times, some users may become aggressive while others may withdraw and have difficulty communicating. Long-term PCP users report memory and speech difficulties, as well as hearing voices or sounds which do not exist.
Users find it difficult to describe and predict the effects of the drug.
For some users, PCP in small amounts acts as a stimulant, speeding up body functions. For many users, PCP changes how users see their own bodies and things around them.