Phencyclidine use disorder is a recognized psychiatric diagnosis describing a pattern of repeated PCP use that causes significant problems in a person’s life, from losing control over how much they use to experiencing serious health and relationship consequences. PCP (also called “angel dust”) is a powerful dissociative drug that was originally developed as an anesthetic but was pulled from medical use because of its severe psychological side effects. The disorder is diagnosed when someone meets at least 2 of 11 specific criteria related to their PCP use.
How PCP Affects the Brain
PCP works primarily by blocking a key receptor involved in learning, memory, and pain perception. This blockade produces the drug’s signature effects: numbness, a sense of detachment from reality, and distorted sensory experiences. But PCP doesn’t stop there. It also increases levels of dopamine, serotonin, and norepinephrine by preventing the brain from reabsorbing them normally. The dopamine surge in particular helps explain why PCP can feel rewarding and why people return to it despite harmful consequences.
One important property of PCP is that it dissolves easily in fat. The drug gets stored in fatty tissue throughout the body and can be released back into the bloodstream days or even months after someone last used it. This means symptoms can resurface unexpectedly long after a person thought the drug had cleared their system.
The 11 Diagnostic Criteria
Phencyclidine use disorder is diagnosed using the same framework applied to other substance use disorders. A clinician looks for at least 2 of 11 criteria, grouped into four categories.
Loss of control includes using PCP in larger amounts or for longer than intended, wanting to cut back but failing, spending excessive time obtaining or recovering from the drug, and experiencing cravings.
Social impairment covers failing to meet responsibilities at work, school, or home because of PCP use, continuing to use despite relationship problems it causes, and giving up activities that used to matter.
Risky use means using PCP in physically dangerous situations or continuing to use it while knowing it’s worsening a physical or psychological condition.
Tolerance means needing increasingly higher doses to feel the same effect. The final criterion, withdrawal, is notable here: the DSM-5-TR does not recognize a formal withdrawal syndrome for PCP, hallucinogens, or inhalants. That said, research in animal models has documented a prolonged depression in the brain’s reward system after PCP cessation. In studies using high chronic doses, this reward deficit lasted for the entire month of observation, which may explain the persistent low mood and inability to feel pleasure that some people report after quitting.
Severity Levels
The number of criteria a person meets determines how the disorder is classified. Meeting 2 or 3 criteria is considered mild. Four or 5 is moderate. Six or more is severe.
What PCP Intoxication Looks and Feels Like
PCP produces a wide range of effects depending on how much someone takes and how they take it (it can be smoked, snorted, swallowed, or injected). At lower doses, people may feel detached from their body, numb to pain, and mildly euphoric. At higher doses, the picture can shift dramatically.
Common signs of intoxication include agitation, confusion, hallucinations, delusions, uncontrolled movements, lack of coordination, muscle rigidity, and a distinctive side-to-side jerking of the eyes called nystagmus. Blood pressure rises, sometimes significantly. At the most dangerous end of the spectrum, people can experience seizures, a catatonic state where they stop moving or responding, or full coma. The half-life of PCP is roughly 21 hours, but symptoms can persist for up to 48 hours after a single dose.
One of the more alarming features of PCP intoxication is violent, unpredictable behavior combined with pain insensitivity. Because the drug blocks pain signals, a person may not realize they’re injuring themselves, which can lead to severe physical harm before anyone intervenes.
PCP-Induced Psychosis
PCP is one of the drugs most strongly associated with episodes of psychosis, meaning a complete break from reality. People experiencing PCP-induced psychosis may have vivid hallucinations, paranoid delusions, disorganized thinking, and extreme agitation. These episodes can look nearly identical to acute schizophrenia, which has historically made diagnosis difficult in emergency settings.
For most people, the psychosis resolves within hours to days as the drug clears their system. But because PCP is stored in fatty tissue and re-released over time, symptoms can fluctuate or recur days to months after the last use. This unpredictable timeline makes PCP-induced psychosis particularly disorienting for both the person experiencing it and their family.
Long-Term Health Consequences
Chronic PCP use carries serious physical risks. Severe muscle rigidity and agitation during intoxication can break down muscle tissue, a condition that can damage the kidneys. Seizures are another significant danger, especially at high doses. Repeated episodes of dangerously high blood pressure also put strain on the cardiovascular system over time.
The cognitive effects of long-term PCP use may persist well beyond the period of active drug use. In one study comparing PCP users who had been sober for an average of 27 months to people who had never used PCP, half of the PCP group still showed measurable impairments on neuropsychological testing, particularly in abstract thinking and the ability to integrate visual and motor information. These deficits suggest that PCP may cause lasting changes to brain function that take a very long time to recover, if they recover fully at all.
Treatment and Recovery
There are currently no medications specifically approved to treat phencyclidine use disorder. Treatment relies on behavioral and psychosocial approaches, the same evidence-based therapies used for other substance use disorders: cognitive behavioral therapy, motivational interviewing, contingency management, and residential or outpatient rehabilitation programs.
The early phase of recovery can be particularly challenging. Even though the DSM does not formally list PCP withdrawal symptoms, people who stop using PCP after heavy or prolonged use commonly report depression, difficulty experiencing pleasure, anxiety, and intense cravings. Research suggests these symptoms reflect a genuine suppression of the brain’s reward circuitry that can persist for weeks. The fat-soluble nature of PCP also means the drug can produce unexpected flare-ups of symptoms during early abstinence, which can be confusing and discouraging.
Because PCP-induced psychosis can linger or recur, some people need psychiatric support alongside addiction treatment. Dual-diagnosis programs that address both the substance use and any co-occurring mental health symptoms tend to produce better outcomes than treating either issue in isolation. Recovery timelines vary widely, but the cognitive and emotional effects of chronic use mean that many people benefit from extended support rather than short-term interventions alone.