Phencyclidine

What is Phencyclidine?

Phencyclidine, widely recognized as PCP, is a synthetic dissociative anesthetic and hallucinogen. Its chemical name, Phenylcyclohexylpiperidin, describes its core structure. Developed in the 1950s as an intravenous surgical anesthetic (Sernyl), its medical use was brief due to severe and unpredictable psychological effects observed in patients, including delirium and hallucinations. Withdrawn from human medicine in 1965 and later from veterinary use, Phencyclidine is now classified as a Schedule I or II controlled substance in many countries, reflecting its high abuse potential and lack of accepted medical application. While not therapeutic, its unique pharmacology continues to be studied in neuroscience research.

How Does it Work?

The primary mechanism of action for Phencyclidine is its role as a potent NMDA receptor antagonist. By blocking these N-methyl-D-aspartate receptors, Phencyclidine disrupts normal glutamate neurotransmission, leading to its characteristic dissociative and anesthetic properties. Beyond NMDA antagonism, Phencyclidine also acts as a dopamine reuptake inhibitor, increasing dopamine levels and contributing to its stimulant and euphoric effects. It also interacts with opioid, alpha-adrenergic, and serotonin systems. This broad pharmacological profile underlies the wide range of effects, from pain relief to profound psychoactive experiences and cognitive impairment, making its actions complex and unpredictable.

Medical Uses

Historically, Phencyclidine's only medical use was as a general anesthetic. Marketed as Sernyl, it provided effective surgical anesthesia without significant respiratory or cardiovascular depression. However, the severe emergence delirium, vivid hallucinations, paranoia, and agitation experienced by patients post-surgery quickly led to its discontinuation in 1965. Though briefly used in veterinary medicine, similar concerns about adverse effects led to its eventual phasing out. Currently, there are no approved medical uses for Phencyclidine in human or veterinary medicine. Its contemporary relevance is primarily in neuroscience research, where it serves as a tool to model aspects of psychotic disorders like schizophrenia due to its ability to induce similar symptoms.

Dosage

As Phencyclidine has no currently approved medical applications, there is no recommended therapeutic dosage. Historically, for its brief anesthetic use, intravenous doses ranged from 0.25 to 0.5 mg/kg, but these were linked to severe adverse psychological reactions. Any use outside of highly controlled, legal research settings is illicit and carries significant health risks. Recreational dosages are highly variable, unpredictable, and extremely dangerous, often leading to overdose, severe intoxication, and life-threatening complications. Factors like purity, co-ingested substances, and individual tolerance further amplify the risks. Due to its status as a controlled substance with high abuse potential, no guidelines for safe or effective dosing exist.

Side Effects

The side effects of Phencyclidine are extensive and often severe:

• Neurological and Psychological: Disorientation, delirium, agitation, paranoia, vivid hallucinations, delusions, severe anxiety, and aggressive behavior are common. High doses can induce seizures, coma, and "PCP psychosis," which may mimic schizophrenia and persist for weeks or months.
• Cardiovascular: Tachycardia, hypertension, and arrhythmias are frequent. Severe cases risk hypertensive crisis, stroke, or heart attack.
• Respiratory: While initially less suppressive, higher doses or co-ingestion with other depressants can cause respiratory arrest.
• Physical: Nystagmus, ataxia, numbness, slurred speech, muscle rigidity, and hyperthermia are often observed.
• Long-term: Chronic abuse can lead to persistent memory loss, speech difficulties, depression, anxiety, and flashbacks.

The unpredictability and severity of these reactions underscore the profound dangers of Phencyclidine use.

Drug Interactions

Interactions with other substances significantly amplify the dangers of Phencyclidine. Due to its complex pharmacology, concurrent use is highly risky.

• CNS Depressants: Combining Phencyclidine with alcohol, benzodiazepines, opioids, or barbiturates can cause additive depressant effects, leading to severe respiratory depression, profound sedation, coma, and death.
• CNS Stimulants: Use with amphetamines, cocaine, or high doses of caffeine can exacerbate stimulant effects, increasing risks of hypertension, tachycardia, seizures, hyperthermia, and acute psychosis.
• Other Psychoactive Drugs: Interactions with other hallucinogens or psychiatric medications are largely unstudied and unpredictable, potentially intensifying psychotic states or causing other severe adverse reactions.
• CYP450 Enzyme Modulators: As Phencyclidine is metabolized by cytochrome P450 enzymes, drugs that inhibit or induce these enzymes could alter its metabolism, affecting drug levels and increasing toxicity or reducing efficacy.

Given these severe risks, any concurrent use of Phencyclidine with other medications or substances should be strictly avoided.

FAQ

Is Phencyclidine legal?

No, Phencyclidine is a Schedule I or II controlled substance in most countries, including the U.S., due to its high abuse potential and lack of accepted medical use. Possession, manufacture, or distribution is illegal.

What are the street names for Phencyclidine?

Common street names for PCP include Angel Dust, Rocket Fuel, Hog, Peace Pill, Embalming Fluid, and Supergrass.

How long do the effects of Phencyclidine last?

Acute effects typically last 4-6 hours, but residual effects like confusion and psychological disturbances can persist for 24-48 hours or longer, especially with high doses. PCP psychosis can last weeks or months.

Is Phencyclidine addictive?

Yes, Phencyclidine has a high potential for psychological dependence and can lead to physical dependence with chronic use. Users may develop tolerance and experience withdrawal symptoms like depression, anxiety, and cravings upon cessation.

Products containing Phencyclidine are available through trusted online pharmacies. You can browse Phencyclidine-based medications at ShipperVIP or Medicenter.

Summary

Phencyclidine (PCP) is a potent synthetic compound with a controversial history. Originally a dissociative anesthetic, its severe psychological effects led to its rapid withdrawal from medical practice. Primarily an NMDA receptor antagonist, it also affects other neurotransmitter systems, resulting in complex and unpredictable effects. With no approved medical uses, Phencyclidine is classified as a highly restricted controlled substance due to its significant abuse potential and severe adverse reactions. Understanding its pharmacology, historical context, and inherent dangers is crucial for public health and safety.