3-MeO-PCP
3-methoxyphencyclidine
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3-MeO-PCP (3-methoxyphencyclidine) is a synthetic dissociative of the arylcyclohexylamine class. It is a structural relative of phencyclidine (PCP), distinguished by greater potency at glutamate receptors.[1] It blocks glutamate signaling in the brain, producing disconnection from body and environment alongside an unusually energized, stimulant-like quality.
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PCP, ketamine, MXE +3 morePCP, ketamine, MXE, 3-HO-PCP, DXM, nitrous oxide show less
First synthesized in 1979 as part of a laboratory study of PCP derivatives,[2] the compound attracted no research interest for three decades. It appeared on grey-market research chemical platforms around 2010,[3] spreading quickly through online drug communities. It is now internationally controlled under UN Schedule II and US DEA Schedule I.[4][5]
Subjective effects include dissociation, stimulation, visual hallucinations, grandiosity, and cognitive disconnection. The experience differs from most dissociatives — rather than sedation and withdrawal, it produces a driven, energized quality that can escalate rapidly into mania-like disinhibition and frank psychosis. Amnesia, agitation, and prolonged aftereffects lasting up to 48 hours are common unwanted outcomes.safety citation needed
Dependence potential has never been formally studied, and the toxic dose is unknown — multiple fatalities are documented, nearly all involving other substances.[6][4] The margin between a stimulating dissociative state and a psychiatric emergency is narrow, and amnesia during the experience prevents self-assessment of danger.[7][8] No controlled human studies exist — what is known comes entirely from forensic case reports and laboratory data.[9]
History[edit]
Discovery
3-MeO-PCP was first synthesized in 1979 by Geneste and colleagues as part of a structural study of PCP derivatives.[2] The compound attracted no further research for three decades. The first reported human use dates to 1999, from a pseudonymous chemist describing effects similar to PCP.[10]
Market emergence and characterization
3-MeO-PCP entered the grey-market research chemical supply around 2010 and was identified in European forensic samples by 2012.[3][11][6] Fatal and non-fatal intoxications followed across Europe and North America.[12][13][14] A 2013 receptor study established its exceptional potency at glutamate receptors and corrected the false belief that it acts on opioid receptors.[1]
Prohibition
Scheduling followed the accumulation of fatal cases. Germany and Sweden listed it in 2015,[15] and the UK listed it as Class B in 2016.[15] The WHO recommended international control in 2020,[9] and the UN placed it on Schedule II in 2021.[4] The US DEA finalized Schedule I placement in March 2026.[5]
The name "3-MeO-PCP" follows standard chemical shorthand: "3-MeO" marks a methoxy group at the third position of the phenyl ring, "PCP" the phencyclidine backbone. Online communities sometimes shorten it to "3-MeO." Its reputation is shaped by its PCP lineage and by its pronounced tendency toward manic and psychotic presentations, distinguishing it from more sedating dissociatives like ketamine that most users encounter first.
Chemistry[edit]
Structural class
3-MeO-PCP belongs to the arylcyclohexylamine family — the same structural class as PCP.[16] A methoxy group at the meta position of the phenyl ring distinguishes it from PCP and its positional isomers, and this substitution is what gives it greater potency at glutamate receptors.[10][2]
Its molecular formula is C₁₈H₂₇NO (273.4 g/mol free base; 309.9 g/mol as the HCl salt).[17]
Pharmacology[edit]
Mechanism of action
3-MeO-PCP blocks glutamate signaling by occupying NMDA receptors — one of the brain's main excitatory channels.[1][9] It binds with exceptional strength, ranking among the most potent NMDA blockers known and exceeding PCP itself.[1] Secondary targets include the sigma-1 receptor — which contributes to its stimulant-like character — and the SERT, where mild inhibition creates drug interaction risk.[1][18]
Pharmacokinetics
No human pharmacokinetic studies have been published.[9] The compound is metabolized primarily in the liver by enzymes — notably CYP2D6 and CYP2C19 — that vary between individuals due to genetics, meaning some people clear it far more slowly than others.[19][20] Standard drug tests do not detect 3-MeO-PCP — confirmation requires specialized mass spectrometry.[21]
Neuroscience[edit]
Where it acts
NMDA blockade disrupts glutamate signaling across brain regions, fragmenting the circuits that normally bind sensory input to higher-order processing. The result is the characteristic dissociative experience — detachment from body, environment, and self.
In the prefrontal cortex, the blockade preferentially silences inhibitory cells, paradoxically increasing excitatory activity and triggering downstream dopamine release.[1] This accounts for both the psychosis-like symptoms and the stimulant edge that distinguish 3-MeO-PCP from more sedating dissociatives like ketamine.
Why it matters
3-MeO-PCP's potent glutamate blockade is directly relevant to theories of how psychosis works in the brain. Documented cases of persistent psychotic symptoms that continue after the drug clears[8] suggest that sustained NMDA disruption may cause lasting changes in brain circuitry — not just temporary chemical effects.
Whether 3-MeO-PCP's two mirror-image molecular forms differ in brain activity is unknown — PCP's do, and the same may apply here. Whether it promotes new neural connections, as Ketamine does, has not been studied.
Subjective Effects[edit]
The 3-MeO-PCP experience combines dissociation with an energized, driven quality unlike any other dissociative. It produces stimulation and grandiosity that can tip rapidly into mania-like disinhibition and frank psychosis as the experience deepens. The margin between a stimulating dissociative state and a psychiatric emergency is narrow.
Compared to ketamine, 3-MeO-PCP produces far less sedation and a much higher risk of psychotic symptoms at equivalent dissociative depth. Compared to PCP, the effects are qualitatively similar — the same stimulant edge and psychotomimetic potential — but reached at lower doses owing to greater receptor potency.[1]
Effect Grid
At common oral doses (~4–8 mg), the full dissociative experience develops: pronounced derealization and depersonalization, cognitive disconnection from the body, and a distinctive manic or euphoric quality. Thought acceleration and grandiosity emerge. Mild visual distortions — drifting, brightening of colors — may occur, though visual effects are less prominent than with serotonergic psychedelics.
Physically, tachycardia and hypertension become clinically relevant. Psychomotor stimulation and disinhibition may impair judgment. Amnesia for portions of the experience is common at the upper end of this range.
The experience commits the user for 4–8 hours, with aftereffects potentially lasting 24–48 hours. Sleep is unlikely during peak effects.
Modeled from the effect's dose-dependence curve — not per-substance measurements.
Touch enhancement · Spatial disorientation · Visual haze / noise · Touch suppression · Music enhancement · Visual acuity enhancement · Perspective distortion · Dreaming enhancement · Internal hallucinations · External hallucinations · Auditory hallucinations · Visual processing suppression · Olfactory hallucination · Visual scenery slicing
Music enhancement · Visual acuity enhancement · Perspective distortion · Dreaming enhancement · Internal hallucinations · External hallucinations · Auditory hallucinations · Visual processing suppression · Olfactory hallucination · Visual scenery slicing
Tactile euphoria · Pain suppression · Appetite suppression · Restlessness · Excessive sweating · Dehydration sensation · Dizziness · Sexual arousal enhancement · Nausea suppression · Increased urination · Nausea · Motor control enhancement · Seizure threshold reduction
Restlessness · Excessive sweating · Dehydration sensation · Dizziness · Sexual arousal enhancement · Nausea suppression · Increased urination · Nausea · Motor control enhancement
Immersion enhancement · Thought deceleration · Thought acceleration · Creativity enhancement · Pattern recognition suppression · Conceptual thinking · Delusions
Creativity enhancement · Pattern recognition suppression · Conceptual thinking
Timeline
First alerts emerge 20-45 minutes after oral ingestion: subtle mood shift, mild cognitive brightening, faint stimulation. Effects are easily overlooked at lower doses.
Dissociative effects build over 30–60 minutes. Derealization and emerging cognitive disconnection become apparent. Stimulant-like qualities — increased confidence, mild disinhibition — intensify.
Maximum dissociation sustained for 30m-1 hour. Full depersonalization, cognitive euphoria or mania-like disinhibition, and psychotomimetic features at higher doses. Cardiovascular stress peaks: tachycardia, hypertension.
Effects plateau and begin gradual decline over 2-3 hours. Dissociation persists at reduced intensity. Cognitive impairment and disinhibition may remain significant.
Gradual return toward baseline over 1–2 hours. Residual cognitive fog, emotional blunting, and mild stimulation persist. Judgment remains impaired.
Residual effects persist for 4–48 hours: mood changes, cognitive fog, disrupted sleep architecture, and subtle perceptual shifts. The wide aftereffect window is characteristic of 3-MeO-PCP.
⚠ Do not drive or operate machinery until at least 48 hours after ingestion and a full night of normal sleep, as residual cognitive impairment may persist well beyond subjective baseline.
Safety[edit]
- Acute toxicity
- High
- Chronic toxicity
- Moderate
- Withdrawal
- None
- Tolerance buildup
- moderate
- Tolerance reset
- 10 days
- Physical
- Low
- Psychological
- Moderate
- Compulsive redosing
- Moderate
- Dose escalation
- Moderate
- Cross-tol.
- PCP · ketamine · MXE
Toxicity
Acute toxicity
The toxic dose of 3-MeO-PCP in humans is unknown — the WHO states this explicitly.[9] Multiple fatalities are documented, and a 2022 review concluded that blood levels associated with toxicity "remain unclear".[6][4] Nearly all fatal cases involved other substances; one death has been attributed to 3-MeO-PCP alone.[7]
In overdose, consistent features include deep coma, agitation during recovery, respiratory depression, low body temperature, dilated pupils, hallucinations, and behavioral disinhibition.[12][7][22]
Cardiovascular toxicity
High blood pressure and rapid heart rate are consistent features of intoxication.[9] Computational modeling predicts risk of heart rhythm disruption,[23] and physical exertion while intoxicated — dancing or vigorous activity — may worsen cardiovascular strain through additive effects on heart rate and blood pressure.[4]
Organ toxicity
Computational modeling predicts that lungs, liver, and blood are the primary organ targets.[23] No human autopsy data specifically characterize organ damage from 3-MeO-PCP.
Psychological risks
3-MeO-PCP carries substantial psychiatric risk. Persistent psychosis after stopping use has been documented — one case described a 29-year-old who developed lasting psychotic symptoms and cognitive impairment after two weeks of repeated use.[8] Paranoia, delusions, and hallucinations appear across multiple case reports.[7][8]
Mania-like presentations — grandiosity, agitation, pressured behavior, and disinhibition — occur at moderate-to-high doses.[7][8] Amnesia during the experience is reported,[7] making it impossible to self-assess dose or recognize dangerous behavior.
Tolerance and dependence
No studies on tolerance or dependence have been published.[9] Tolerance figures circulating in harm reduction resources — including a "5-day half-life" and "1.5-week full reset" — derive from user reports and inference from PCP/ketamine pharmacology, not primary research.safety citation needed
Dependence liability is inferred by analogy with PCP, which has documented dependence potential. Regulatory scheduling as DEA Schedule I[5] and UN Schedule II[9] reflects high assessed abuse potential — but direct experimental evidence is absent.
Drug interactions
CNS depressant combinations
Alcohol combines with 3-MeO-PCP to deepen sedation and suppress breathing — it appears in multiple fatal and non-fatal cases.[12][14]
Opioids present extreme risk: one documented fatality involved combined 3-MeO-PCP and an opioid metabolite, with additive breathing suppression as the probable cause.[24]
Benzodiazepines appeared in one fatal polysubstance case.[13] Medically they are used to manage 3-MeO-PCP agitation, but unsupervised combination carries breathing-suppression risk.
Serotonergic interactions
3-MeO-PCP inhibits serotonin reuptake, creating a theoretical risk of serotonin syndrome — a potentially life-threatening overheating and seizure response — when combined with SSRIs, SNRIs, MAOIs, or serotonergic psychedelics.[1] No published cases document this outcome, but the mechanism is pharmacologically plausible.
Metabolic interactions
3-MeO-PCP is broken down by liver enzymes including CYP2D6, CYP2C19, CYP2B6, and CYP3A4.[19][20] Drugs that inhibit these enzymes — including paroxetine, fluoxetine, bupropion, omeprazole, and fluvoxamine — may slow its breakdown and raise blood levels. Paroxetine and bupropion were present in one fatal polysubstance case.[13]
Stimulant combinations
Multiple fatal cases involved amphetamine co-use.[14][11] The combination increases cardiovascular strain, psychosis risk, and overheating risk.
Contraindications
No formal contraindication studies exist. The following are inferred from pharmacology and clinical reports.
Heart conditions: High blood pressure and rapid heart rate are consistent features of intoxication,[9] and computational modeling predicts heart rhythm disruption risk.[23] Pre-existing cardiovascular disease, high blood pressure, irregular heart rhythms, or long QT syndrome are absolute contraindications.
Psychotic disorders and bipolar disorder: 3-MeO-PCP reliably produces psychosis-like effects and has triggered lasting substance-induced psychotic disorder.[8] Personal or family history of psychotic spectrum disorders or bipolar disorder is an absolute contraindication.
Liver impairment: Liver metabolism is the primary elimination route.[19] Impaired liver function may produce elevated, prolonged blood concentrations.
Pregnancy: No reproductive toxicity data exist. By analogy with PCP and other glutamate blockers, which cause developmental brain damage in animal models, pregnancy is an absolute contraindication.safety citation needed
Harm Reduction[edit]
Forms & Identification
3-MeO-PCP is most commonly encountered as a white crystalline powder (hydrochloride salt). It is visually indistinguishable from many other research chemical dissociatives — mislabeled products are documented. Quantitative testing through a drug-checking service is the most reliable way to confirm identity, since standard reagent panels cannot reliably differentiate arylcyclohexylamines from one another.
Even small errors in identification or purity estimation matter. 3-MeO-PCP is active at very low doses — a modest miscalculation can dramatically shift the risk profile.
Guidelines
- Weigh doses with a milligram-precision scale — volumetric dosing errors with a compound this potent can be medically dangerous
- Start with a threshold dose and wait the full onset period before considering redosing — oral onset can be slow and the temptation to redose prematurely is a documented cause of overdose
- Have a sober, trusted sitter present who understands the compound's tendency toward mania and behavioral disinhibition
- Remove access to vehicles, keys, sharp objects, and anything that could facilitate harm during a disinhibited state
- Use in a private, calm environment — avoid public spaces, crowds, and settings involving physical exertion
- Prepare water and comfortable surroundings in advance; do not plan to leave the setting during the experience
- Set a hard rule against redosing — amnesia during the experience can make it impossible to remember what has already been taken
Set & Setting
The psychological and physical environment matters more here than with most dissociatives. The compound's stimulant quality and tendency toward mania-like disinhibition mean that chaotic or public settings increase the risk of dangerous behavior. A calm, private, familiar environment with a sober sitter is strongly advisable.
Mental state matters equally. Anxiety or agitation may escalate into paranoia or psychotic symptoms. The aftereffect window can persist up to 48 hours — responsibilities and obligations for the following day should be cleared in advance.
Aftercare & integration. The aftereffect window can persist up to 48 hours, during which cognitive function, emotional regulation, and sleep may remain disrupted. Rest, hydration, and light nutrition support physical recovery.
Experiences involving mania, grandiosity, or psychotic features may require active psychological processing. Talking through frightening or confusing episodes with a trusted person helps reintegrate the experience. Persistent symptoms beyond 72 hours — especially paranoia, hallucinations, or thought disorganization — warrant professional evaluation, as substance-induced psychotic disorder has been documented with this compound.[8]
Avoid other substances during the aftereffect period — altered brain chemistry may amplify interactions or adverse effects.
Recovery & Support
Compulsive use patterns with dissociatives can develop gradually, particularly with compounds that produce stimulant-like effects and grandiosity. If use has become regular, escalating, or difficult to control, professional support is warranted.
Harm reduction services and addiction support organizations provide confidential assessment and referral. Persistent psychological effects after 3-MeO-PCP use — including lasting psychosis, cognitive impairment, or depersonalization — warrant psychiatric evaluation rather than waiting for symptoms to resolve on their own.
Recovery resources, crisis lines, and support pathways → View all
Emergency Response
Recognizing an emergency: Unresponsiveness or inability to be roused, seizure activity, extremely slow or irregular breathing, severe agitation with self-harm risk, rigid or overheated body, or psychotic behavior (paranoid delusions, complete detachment from reality) all require immediate medical help.
Immediate steps:
- Call emergency services immediately if the person is unresponsive, seizing, or breathing abnormally
- Place an unconscious but breathing person in the recovery position (on their side, airway clear)
- Do not restrain an agitated person unless there is immediate risk of self-harm or harm to others — restraint can escalate agitation
- Do not induce vomiting
- Stay with the person and monitor breathing continuously
What to tell the dispatcher: Name the substance (3-MeO-PCP, a dissociative), the approximate amount and time taken, the route of administration, and current symptoms. Good Samaritan laws in many jurisdictions protect people who call for help during a drug emergency.
No substance-specific antidote exists. Hospital treatment is supportive: airway management, benzodiazepines for agitation,[7] antipsychotics for persistent psychosis,[8] and continuous heart monitoring.[23] Standard drug tests will not detect 3-MeO-PCP — inform medical staff of the specific substance.[21]
Legal Status[edit]
As of April 2025, 3-MeO-PCP is internationally controlled — placed on Schedule II of the 1971 Convention on Psychotropic Substances by the UN in 2021,[4][9] and placed on Schedule I of the US Controlled Substances Act by DEA final rule in March 2026.[5]
| Jurisdiction | Classification | Key provisions |
|---|---|---|
| International (UN) | Schedule II, 1971 Convention on Psychotropic Substances | Placed April 2021 by UN Commission on Narcotic Drugs[4] |
| United States | Schedule I, Controlled Substances Act | DEA proposed June 2025; final rule March 2026[5] |
| United Kingdom | Class B (Misuse of Drugs Act) | Generic arylcyclohexylamine clause February 2013; explicitly listed May 2016[15] |
| Germany | Annex II (controlled narcotic) | Added May 2015[15] |
| Sweden | Controlled substance | Declared January 2015[15] |
| Czech Republic | Scheduled | Government Decree 243/2015, October 2015[15] |
| Canada | Schedule I (analogue provision) | Controlled under PCP analogue provisions of the Controlled Drugs and Substances Act[10] |
| Australia | Unconfirmed | Specific scheduling not verified in available literaturecitation needed |
Legal status changes frequently. This information reflects available records as of April 2025 and is not legal advice. Verify current laws in each jurisdiction independently.
references
- [1]
- [2]
- [3] ^abJohansson A, Lindstedt D, Roman M, Thelander G, Nielsen EI, Lennborn U, Sandler H, Rubertsson S, Ahlner J, Kronstrand R, Kugelberg FC (2017) A non-fatal intoxication and seven deaths involving the dissociative drug 3-MeO-PCP — Forensic Science International doi:10.1016/j.forsciint.2017.02.034
- [4]
- [5]
- [6] ^abcArbouche N, Kintz P, Zagdoun C, Gheddar L, Raul JS, Ameline A (2021) Determination of 3-MeO-PCP in human blood and urine in a fatal intoxication case, with a specific focus on metabolites identification — Forensic Sciences Research doi:10.1080/20961790.2021.1928821