PCP (Phencyclidine) is the drug that can cause acute anxiety, a feeling of impending doom, paranoia, violent hostility, and in some it may produce a psychosis indistinguishable from schizophrenia. It could be in form of powder, tablet, capsule and liquid, so PCP may be snorted, smoked, injected, or swallowed. Many believe that PCP is one of the most dangerous drugs of abuse.