PCP is best described as which type of drug?

• A. A dissociative anesthetic
• B. A benzodiazepine
• C. An opioid analgesic
• D. A stimulant

Answer: (A)

PCP is best described as a dissociative anesthetic. It produces a sense of detachment from self and the surrounding environment, along with analgesia and anesthesia-like effects. This dissociation comes from NMDA receptor antagonism, which disrupts glutamatergic signaling involved in perception, memory, and pain processing. Historically, PCP was developed as an anesthetic, but safety concerns led to its withdrawal from medical use. Clinically, it can cause perceptual distortions, agitation or psychosis, nystagmus, and autonomic changes. It is not a benzodiazepine (which are GABA-A receptor modulators with sedative effects), nor an opioid analgesic (which act on mu receptors to produce analgesia and respiratory depression), nor a stimulant (which heightens CNS activity). The defining feature to recognize is the dissociative effect with analgesia, which sets it apart from the other classes.