3-HO-PCE (3-hydroxyphencyclidine-ethyl, also called 3-hydroxy-PCE) is a synthetic dissociative of the arylcyclohexylamine class, structurally related to both PCE (N-ethyl-1-phenylcyclohexylamine) and 3-HO-PCP. Like its closely related analog 3-HO-PCP, the 3-hydroxy substitution confers significant mu-opioid receptor agonist activity in addition to NMDA receptor antagonism — making it pharmacologically distinct from "pure" dissociatives like ketamine and fundamentally more complex in its risk profile.
Community reports describe 3-HO-PCE as notably psychedelic — users consistently observe that it produces richer visual and perceptual effects than would be expected from a dissociative alone, likely reflecting the combined activity at NMDA receptors and potentially serotonergic pathways. One experienced Reddit community member described it as "surprisingly psychedelic" in a way that distinguished it from simpler dissociatives. The opioid component adds a layer of warmth, analgesia, and potential euphoria that community members note makes it both more appealing and substantially more hazardous than pure dissociatives.
The dual pharmacology — NMDA antagonism plus opioid agonism — creates additive CNS and respiratory depression, placing 3-HO-PCE in a more dangerous category than ketamine for respiratory risk. This substance should be treated with the same caution as opioid-dissociative combinations and is not suitable for inexperienced users.
Safety at a Glance
High Risk- Treat as an Opioid-Dissociative Combination
- The most important harm reduction principle for 3-HO-PCE is to recognize that it is not a "pure" dissociative like ke...
- Toxicity: Respiratory Depression — Primary Risk The combination of NMDA antagonism and mu-opioid receptor agonism creates meani...
- Dangerous with: Acetylfentanyl, Buprenorphine, Codeine, Desomorphine (+15 more)
- Overdose risk: Overdose on 3-HO-PCE can range from unpleasant to life-threatening depending on the dose, route, ...
If someone is in crisis, call 911 or Poison Control: 1-800-222-1222
Dosage
oral
Duration
oral
Total: 4 hrs – 6 hrsHow It Feels
The onset is a slow bloom of warmth that starts in the belly and spreads outward through the chest and into the limbs, arriving with the unhurried assurance of sunlight crossing a floor. Within twenty or thirty minutes there is a softening at the edges of perception — sounds become rounder, the texture of fabric under your fingertips grows impossibly rich, and the space between thoughts widens into something almost meditative. The warmth is not metaphorical. Your skin actually feels heated from within, a deep, radiating glow that carries an unmistakable opioid signature: comforting, enveloping, and slightly soporific.
As the dissociation builds, it wraps itself around the warmth like a second blanket. The world does not fracture or fragment the way it does with sharper dissociatives — instead, it softens, as though someone has applied a gentle Gaussian blur to reality itself. Sounds seem to arrive through water, pleasantly muffled and resonant. Your body grows heavy in the most agreeable way possible, sinking into whatever surface supports it with a sense of profound relief. Thoughts slow and deepen; the usual anxious chatter of the mind quiets to a murmur, replaced by long, contemplative threads that unspool without urgency.
The peak is a place of remarkable tenderness. There is an emotional openness here that is unusual among dissociatives — a capacity for compassion and connection that sits alongside the detachment rather than being erased by it. Music sounds impossibly beautiful, each note arriving with an emotional weight that can bring tears without sadness. Closed-eye visuals are dark and flowing: slow rivers of color moving through cavern-like spaces, organic forms that breathe and pulse. The opioid warmth persists throughout, lending the entire experience a quality of being held — cradled in some vast, indifferent kindness.
The comedown is gentle and long. The warmth recedes last, like embers cooling in a fireplace, and there is a lingering afterglow of emotional softness that can persist into the following day. The body feels loose and rested, as though it has been carried rather than walked. Sleep arrives easily and is deep. The compound leaves you with the impression of having been somewhere very still and very kind — a room you did not know existed inside your own mind.
Subjective Effects
The effects listed below are based on the Subjective Effect Index (SEI), an open research literature based on anecdotal reports and personal analyses. They should be viewed with a healthy degree of skepticism. These effects will not necessarily occur in a predictable or reliable manner, although higher doses are more liable to induce the full spectrum of effects.
Physical Effects
Physical(15)
- Appetite suppression— A distinct decrease in hunger and desire to eat, ranging from reduced interest in food to complete d...
- Changes in felt gravity— A distortion of one's proprioceptive sense of gravity in which the perceived direction of gravitatio...
- Dehydration— A state of insufficient bodily hydration manifesting as persistent thirst, dry mouth, and physical d...
- Difficulty urinating— Difficulty urinating, also known as urinary retention, is the experience of being unable to easily p...
- Dizziness— A sensation of spinning, swaying, or lightheadedness that impairs balance and spatial orientation, o...
- Increased blood pressure— Increased blood pressure (hypertension) is an elevation of arterial pressure above the normal 120/80...
- Increased heart rate— A noticeable acceleration of heartbeat that can range from a subtle awareness of one's pulse to a fo...
- Motor control loss— A distinct decrease in the ability to control one's physical body with precision, balance, and coord...
- Pain relief— A suppression of negative physical sensations such as aches and pains, ranging from dulled awareness...
- Physical autonomy— Physical autonomy is the experience of one's body performing actions — from simple tasks like walkin...
- Respiratory depression— A dangerous slowing and shallowing of breathing that can progress from barely noticeable reductions ...
- Sedation— A state of deep physical and mental calming that manifests as a progressive desire to remain still, ...
- Seizure— Uncontrolled brain electrical activity causing convulsions and loss of consciousness -- a life-threa...
- Spatial disorientation— Spatial disorientation is the inability to accurately perceive one's position or orientation within ...
- Stimulation— A state of heightened physical and mental energy characterized by increased wakefulness, elevated mo...
Tactile(2)
- Tactile enhancement— The sense of touch becomes dramatically heightened, making physical contact feel intensely pleasurab...
- Tactile suppression— A progressive decrease in the ability to feel physical touch, ranging from mild numbness to complete...
Cognitive & Perceptual Effects
Visual(9)
- Frame rate suppression— Perception of visual motion as choppy discrete frames rather than smooth continuous flow, resembling...
- Internal hallucination— Vivid, detailed visual experiences perceived within an imagined mental landscape that can only be se...
- Perspective distortions— Distortion of perceived depth, distance, and size of real objects, making things appear closer, furt...
- Perspective hallucination— A hallucinatory phenomenon in which the observer's visual perspective shifts from the normal first-p...
- Scenery slicing— The visual field fractures into distinct, cleanly cut sections that slowly drift apart from their or...
- Settings, sceneries, and landscapes— The perceived environment in which hallucinatory experiences take place, ranging from recognizable l...
- Visual acuity enhancement— Vision becomes sharper and more defined than normal, as though a slightly blurry lens has been broug...
- Visual acuity suppression— Vision becomes blurred, indistinct, and out of focus, as though looking through a smudged lens. Fine...
- Visual disconnection— A dissociative visual effect involving a progressive detachment from visual perception, ranging from...
Cognitive(19)
- Amnesia— A complete or partial inability to form new memories or recall existing ones during and after substa...
- Anxiety— Intense feelings of apprehension, worry, and dread that can range from a subtle background unease to...
- Anxiety suppression— A partial to complete suppression of anxiety and general unease, producing a calm, relaxed mental st...
- Cognitive euphoria— A cognitive and emotional state of intense well-being, elation, happiness, and joy that manifests as...
- Compulsive redosing— An overwhelming, difficult-to-resist urge to continuously take more of a substance in order to maint...
- Conceptual thinking— A shift in the nature of thought from verbal, linear sentence structures to intuitive, non-linguisti...
- Delusion— A delusion is a fixed, false belief that is held with unshakeable certainty and is impervious to con...
- Depersonalization— A detachment from one's own sense of self, body, or mental processes, as if observing oneself from o...
- Depression— A persistent state of low mood, emotional numbness, hopelessness, and diminished interest or pleasur...
- Derealization— A perceptual disturbance in which the external world feels profoundly unreal, dreamlike, or artifici...
- Disinhibition— A marked reduction in social inhibitions, self-consciousness, and behavioral restraint that manifest...
- Immersion enhancement— A heightened capacity to become fully absorbed and engrossed in external media such as music, films,...
- Mania— Abnormally elevated mood, energy, and activity with impulsive behavior and grandiosity, associated w...
- Memory suppression— A dose-dependent inhibition of one's ability to access and utilize short-term and long-term memory, ...
- Paranoia— Irrational suspicion and belief that others are watching, plotting against, or intending harm toward...
- Psychosis— Psychosis is a serious psychiatric state involving a fundamental break from consensus reality — char...
- Thought deceleration— The experience of thoughts occurring at a markedly reduced pace, as if the mind has been placed into...
- Thought disorganization— Thought disorganization is a cognitive impairment in which the normal capacity for structured, seque...
- Time distortion— Subjective perception of time becomes dramatically altered — minutes may feel like hours, or hours p...
Multi-sensory(2)
- Olfactory hallucination— Olfactory hallucinations (phantosmia) involve the perception of convincing phantom smells — pleasant...
- Scenarios and plots— Scenarios and plots are the narrative structures that emerge within hallucinatory states — coherent ...
Transpersonal(1)
- Ego death— A profound dissolution of the sense of self in which personal identity, memories, and the boundary b...
Pharmacology
Primary Mechanism: NMDA Antagonism
3-HO-PCE acts as a non-competitive NMDA receptor antagonist through the same open-channel blocking mechanism shared by ketamine, PCP, and other arylcyclohexylamines. This disrupts thalamocortical signaling, producing dose-dependent analgesia, perceptual distortion, and dissociation.
Critical Secondary Mechanism: Mu-Opioid Receptor Agonism
The 3-hydroxy substitution — the defining structural feature shared with 3-HO-PCP — confers significant affinity for the mu-opioid receptor (MOR). This is the receptor mediating the analgesic, euphoric, and respiratory-depressant effects of opioids. 3-HO-PCE's opioid activity adds:
- Enhanced analgesia (both NMDA-mediated and opioid-mediated)
- Opioid-like euphoria and physical warmth
- Meaningful respiratory depression risk — significantly greater than for ketamine alone
- Additive CNS depression when combined with any opioid or sedative
Psychedelic Character
Community reports consistently describe 3-HO-PCE as more visually and psychedelically active than would be expected from NMDA antagonism alone. This may reflect activity at serotonin receptors (5-HT2A), sigma receptors, or other targets that have not been fully characterized through formal binding studies.
Duration
3-HO-PCE appears to have a longer duration than ketamine — community estimates typically range from 2–4 hours. This extended duration extends the window of impairment and risk, particularly with respect to respiratory monitoring.
Detection Methods
Standard Drug Panel Inclusion
3-HO-PCE is unlikely to trigger a positive result on standard PCP immunoassay screens. The combination of the hydroxyl group and the ethyl substitution on nitrogen creates sufficient structural divergence from PCP to reduce immunoassay cross-reactivity. Standard 5-panel and 10-panel tests will most likely return negative results for 3-HO-PCE.
Urine Detection
3-HO-PCE is detectable in urine for approximately 2 to 5 days after a single dose. The hydroxyl group facilitates direct glucuronidation, which may contribute to slightly faster renal clearance compared to non-hydroxylated analogues. Metabolic pathways include glucuronidation and further hydroxylation. Reliable detection requires LC-MS/MS methods specifically targeting 3-HO-PCE and its metabolites.
Blood and Serum Detection
Blood detection windows are approximately 1 to 2 days. Pharmacokinetic data is limited to case reports and in vitro metabolism studies. Active blood concentrations are in the low nanogram-per-milliliter range. Like 3-HO-PCP, this compound has mu-opioid receptor activity that contributes to its toxicity profile.
Hair Follicle Detection
Hair analysis is theoretically feasible using LC-MS/MS methods but has not been specifically validated for 3-HO-PCE.
Confirmatory Methods
LC-MS/MS is required for definitive identification. The compound must be explicitly included in designer dissociative panels. Reference standards are available from forensic chemistry suppliers.
Reagent Testing
The Mandelin reagent may produce a dark brown color. Other standard reagents are unlikely to produce diagnostic reactions. Fentanyl test strips should be used on any product obtained from unregulated sources.
Interactions
| Substance | Status | Note |
|---|---|---|
| Acetylfentanyl | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Buprenorphine | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Codeine | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Desomorphine | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Dextropropoxyphene | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Dihydrocodeine | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Ethylmorphine | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Fentanyl | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Heroin | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Hydrocodone | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Hydromorphone | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Kratom | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Methadone | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Morphine | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Naloxone | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| O-Desmethyltramadol | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Oxycodone | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Oxymorphone | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| Pethidine | Dangerous | Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration |
| 1,4-Butanediol | Caution | Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression |
| 2-Fluorodeschloroketamine | Caution | Compounding dissociative effects can cause confusion, mania, and loss of motor control |
| 2M2B | Caution | Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression |
| 3-Cl-PCP | Caution | Compounding dissociative effects can cause confusion, mania, and loss of motor control |
| 3-HO-PCP | Caution | Compounding dissociative effects can cause confusion, mania, and loss of motor control |
| 1,3-Butanediol | Low Risk & Synergy | Produces unique synergistic effects; often combined |
| 1B-LSD | Low Risk & Synergy | Produces unique synergistic effects; often combined |
| 1cP-AL-LAD | Low Risk & Synergy | Produces unique synergistic effects; often combined |
| 1cP-LSD | Low Risk & Synergy | Produces unique synergistic effects; often combined |
| 1cP-MiPLA | Low Risk & Synergy | Produces unique synergistic effects; often combined |
History
Origins
3-HO-PCE emerged from the systematic exploration of arylcyclohexylamine structure-activity relationships. The pharmacological significance of the 3-hydroxy substitution — specifically its capacity to confer opioid receptor affinity while retaining NMDA antagonism — was recognized through early research on 3-HO-PCP in the 1970s and 1980s. 3-HO-PCE represents the application of this substitution to the PCE (N-ethyl) scaffold.
Research Chemical Status
3-HO-PCE entered the research chemical market in the context of the broader novel dissociative wave of the 2010s. It occupies a specialized niche — sought by users interested in the opioid-dissociative combination effect, though community engagement is limited compared to less complex analogs. Its dual pharmacology is a source of both interest and caution in harm reduction communities.
Significance
3-HO-PCE represents an important pharmacological case study: the structural modification that adds opioid activity to a dissociative scaffold, creating a compound qualitatively more dangerous than its parent structures. This pattern (shared with 3-HO-PCP and the endogenous compound norketamine's metabolite) illustrates how minor structural changes can dramatically alter the risk profile of dissociative compounds.
Harm Reduction
Treat as an Opioid-Dissociative Combination
The most important harm reduction principle for 3-HO-PCE is to recognize that it is not a "pure" dissociative like ketamine. The opioid activity requires opioid-level precautions:
- Have naloxone (Narcan) available — this is essential for anyone using 3-HO-PCE
- Never use alone — a sober companion with access to naloxone is critical
- Never combine with other opioids, alcohol, or benzodiazepines — the respiratory risk becomes extreme
Start Extremely Low
Community reports note that 3-HO-PCE has variable and sometimes unpredictable potency. Begin with a very small test dose (5 mg or less) and wait the full expected duration (3–4 hours) before considering redosing.
Monitor Breathing
At higher doses, actively monitor breathing rate. Respiratory rates below 12 breaths per minute at rest are a warning sign. Position users on their side (recovery position) to prevent aspiration if they lose consciousness.
Avoid Opioid Combinations Absolutely
Combining 3-HO-PCE with any opioid (including prescribed opioids), alcohol, benzodiazepines, or GHB is extremely dangerous. The additive respiratory depression from these combinations is the most likely route to fatal overdose.
Bladder Protection
As with all arylcyclohexylamines, limit use frequency and monitor for urological symptoms.
Toxicity & Safety
Respiratory Depression — Primary Risk
The combination of NMDA antagonism and mu-opioid receptor agonism creates meaningful respiratory depression risk that significantly exceeds that of ketamine alone. This is the defining toxicity concern for 3-HO-PCE. High doses or combination with any other CNS depressant (alcohol, benzodiazepines, opioids, GHB) can produce life-threatening respiratory suppression.
Unlike ketamine, where the dissociative dose is substantially lower than the respiratory depressant dose, 3-HO-PCE's opioid component narrows this therapeutic index considerably.
Opioid-Associated Risks
- Overdose risk — The opioid activity means that 3-HO-PCE can precipitate classic opioid overdose presentations (unconsciousness, reduced respiratory rate, pinpoint pupils)
- Opioid dependence — With regular use, both physical opioid dependence and psychological dependence can develop
- Opioid withdrawal — Cessation after heavy use may produce opioid-like withdrawal symptoms
Urological Toxicity
As with all arylcyclohexylamines, regular use carries risk of bladder and urinary tract damage comparable to ketamine-associated cystitis.
Psychological Risks
The intensely psychedelic character increases the risk of difficult or overwhelming experiences, particularly at higher doses. Paranoia, ego dissolution, and existential distress are possible.
Addiction Potential
moderately addictive with a moderate potential for adverse side effects such as psychosis
Overdose Information
Overdose on 3-HO-PCE can range from unpleasant to life-threatening depending on the dose, route, and whether other substances are involved.
Signs of overdose: Severe nystagmus, complete unresponsiveness, vomiting (aspiration risk while unconscious), severely depressed breathing, seizures, extremely elevated heart rate or blood pressure.
Critical dangers:
- Respiratory depression: Particularly when combined with other depressants
- Aspiration: Loss of protective reflexes combined with nausea creates choking risk
- Hyperthermia or hypothermia: Impaired thermoregulation at high doses
Emergency response: Place the person in the recovery position. Monitor breathing. Call emergency services if breathing is slow, shallow, or irregular; if the person is unresponsive to stimulation; or if seizures occur. Be honest with medical personnel about what was consumed — they are there to help, not to judge.
Dangerous Interactions
The combinations listed below may be life-threatening. Independent research should always be conducted to ensure safety when combining substances.
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Both cause respiratory depression and unconsciousness; vomiting while dissociated risks aspiration
Tolerance
| Full | with prolonged and repeated use |
| Half | 4 - 7 days |
| Zero | 1 - 2 weeks |
Cross-tolerances
Legal Status
Germany:** 3-HO-PCE is controlled under the NpSG (New Psychoactive Substances Act) as of July 18, 2019. Production and import with the aim to place it on the market, administration to another person and trading is punishable. Possession is illegal but not penalized.
Sweden: 3-HO-PCE is not a controlled substance for research purposes. It is illegal to consume.
Switzerland:** 3-HO-PCE is a controlled substance specifically named under Verzeichnis E.
Turkey:** 3-HO-PCE is a classed as drug and is illegal to possess, produce, supply, or import.
United Kingdom:** 3-HO-PCE is a class B drug in the UK and is illegal to possess, produce, supply, or import. As a derivative of 1-Phenylcyclohexylamine where the amine has been replaced with a 1-piperidyl group, further substituted in the phenyl ring with a hydroxy substituent, it is covered by the arylcyclohexylamine generic clause added to the Misuse of Drugs Act by S.I. 2013/239, which came into effect on the 26th February 2013.
Responsible use
Research chemical
3-HO-PCE (Isomer Design)
Discussion
The Big & Dandy 3-HO-PCE Thread (Bluelight)
Interview with a Ketamine Chemist (VICE)
Morris, H., & Wallach, J. (2014). From PCP to MXE: A comprehensive review of the non-medical use of dissociative drugs. Drug Testing and Analysis, 6(7–8), 614–632. https://doi.org/10.1002/dta.1620
Experience Reports (1)
Tips (7)
Weigh your dose of 3-HO-PCE with a milligram scale. Dissociative dose-response curves are steep. The difference between a pleasant floaty experience and complete dissociation from reality can be 50mg or less.
Combining 3-HO-PCE with stimulants places extreme strain on the cardiovascular system. The opposing effects on heart rate and blood pressure can cause dangerous fluctuations and cardiac events.
3-HO-PCE is surprisingly psychedelic even at low doses. At just 10mg, users report vivid closed-eye imagery, enhanced autobiographical memory recall, and a neutral headspace that invites self-directed mental exploration.
Never use 3-HO-PCE near water (bathtubs, pools, lakes). Dissociation and water are a deadly combination. Loss of body coordination and awareness while near water has caused drownings.
3-HO-PCE pairs well with cannabis but the combination will potentiate both substances significantly. Start with a lower dose of each if combining. Avoid combining with other dissociatives or stimulants.
3-HO-PCE is relatively unpopular mainly due to its high price per dose, but those who try it are often impressed. There is slight vasoconstriction but the body load is otherwise comfortable. Duration is about 4+ hours with a slow 1-hour onset.
Community Discussions (1)
See Also
References (3)
- Ketamine as a rapid antidepressant — Berman et al. Biological Psychiatry (2000)paper
- 3-HO-PCE - TripSit Factsheet
TripSit factsheet for 3-HO-PCE
tripsit - 3-HO-PCE - Wikipedia
Wikipedia article on 3-HO-PCE
wikipedia