PCP (phencyclidine) is classified as a hallucinogen, but it belongs to a specific subcategory called dissociative drugs, which work differently from classic hallucinogens like LSD or psilocybin mushrooms. The DEA lists PCP under the hallucinogens class, and federal survey data from SAMHSA groups it in the hallucinogens category. So the short answer is yes, but the full picture is more nuanced than that label suggests.
Why PCP Is Called a Hallucinogen
Hallucinogens are commonly divided into two broad categories: classic hallucinogens (like LSD and psilocybin) and dissociative drugs (like PCP, ketamine, and DXM). Both groups can distort how you perceive time, motion, colors, sounds, and your own body. Both can cause hallucinations. That shared ability to alter perception is why they’re grouped under the same umbrella.
PCP is a Schedule II controlled substance under the Controlled Substances Act, meaning it has a high potential for abuse and can lead to severe psychological or physical dependence. It sits alongside cocaine, fentanyl, and methamphetamine in that schedule, though it’s pharmacologically very different from those drugs.
How PCP Differs From Classic Hallucinogens
Classic hallucinogens like LSD and psilocybin produce their effects primarily by acting on serotonin circuits in the brain. They intensify sensory experiences: colors look brighter, sounds seem sharper, and some people report “seeing” sounds or “hearing” colors. Emotions can swing wildly, and real-world sensations may feel unreal or frightening.
PCP works through an entirely different mechanism. It disrupts the activity of glutamate, a brain chemical involved in learning, memory, and perception, by blocking a specific type of receptor on nerve cells. PCP binds to these receptors with roughly ten times greater strength than ketamine, a related dissociative drug. This is why PCP’s effects tend to be more intense and longer lasting than ketamine’s.
The subjective experience also differs. Rather than the vivid sensory intensification of LSD, PCP is more likely to make you feel detached from your own body and disconnected from your surroundings. NIDA describes the core dissociative experience as feeling “out of control and disconnected from their body and environment.” That floating, detached quality is the hallmark that separates dissociatives from classic hallucinogens.
What PCP Actually Feels Like
At low to moderate doses, PCP changes sensory perception: sight, sound, shapes, time, and body image all become distorted. People often report a sense of floating or weightlessness and a feeling of detachment from themselves and their surroundings. These effects can feel dreamlike or disorienting rather than the vivid, colorful experience associated with mushrooms or LSD.
At higher doses, the effects escalate significantly. Full hallucinations can occur, both visual and auditory. But PCP also carries risks that classic hallucinogens typically don’t. At moderate to high doses, it can cause seizures, severe muscle contractions, aggressive or violent behavior, and psychotic symptoms that resemble schizophrenia. This combination of dissociation, hallucination, and potential for aggression is part of what gives PCP its reputation as an especially dangerous drug.
A severe overdose can lead to respiratory depression, coma, convulsions, and death from respiratory arrest.
PCP’s Origins as an Anesthetic
PCP was originally developed as a surgical anesthetic and marketed under the brand name Sernyl. It entered clinical use in 1963, but doctors quickly noticed a serious problem: patients waking up from PCP anesthesia experienced intense dysphoria and hallucinations. By 1967, just four years after its introduction, PCP was discontinued for human use. Its chemical cousin ketamine, which produces a lower rate and shorter duration of those same emergence reactions, eventually replaced it in medical settings.
How PCP Compares to Ketamine
PCP and ketamine are chemical relatives that both belong to the dissociative anesthetic class. They block the same type of receptor in the brain, but PCP does so with far greater potency. PCP’s effects last longer, take longer to wear off, and are more likely to produce severe adverse reactions.
Ketamine has a lower potency, a shorter duration of action, and a faster onset. It also produces fewer and shorter-lasting emergence reactions like vivid dreams and hallucinations. This more manageable profile is why ketamine remained in medical use while PCP did not. Ketamine at high doses can produce intense sensory detachment (sometimes called a “K-hole”), but PCP is more likely to produce aggression, psychosis-like symptoms, and dangerous physical effects at equivalent levels of intoxication.
How Common Is PCP Use Today?
PCP use is rare. According to the 2024 National Survey on Drug Use and Health, fewer than 0.1% of Americans aged 12 or older reported using PCP in the past year. Even among young adults aged 18 to 25, the group with the highest rate, only about 0.1% reported past-year use. For context, 3.6% of Americans used some type of hallucinogen in the past year, meaning PCP accounts for a tiny fraction of overall hallucinogen use. Psilocybin, LSD, and MDMA are all far more commonly used.
Despite its low prevalence, PCP still circulates in some regions and is sometimes found as an adulterant in other drugs, which means people can be exposed to it without knowing.
The Bottom Line on Classification
PCP is officially classified as a hallucinogen by both the DEA and major health agencies. But calling it simply a “hallucinogen” undersells what makes it distinctive. It’s a dissociative drug that can cause hallucinations, yes, but its primary effects center on detachment, distorted body perception, and disconnection from reality. It works on completely different brain chemistry than LSD or mushrooms, carries a higher risk of dangerous physical and psychological effects, and produces an experience that most users describe as fundamentally different from a classic psychedelic trip.