How long does 3-HO-PCE last?

The total duration of 3-HO-PCE via oral is 4 hours to 6 hours.

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3-HO-PCE — SubstanceWiki

3-HO-PCE

Arylcyclohexylamines · Dissociatives

19 dangerous interactions — combining 3-HO-PCE with certain substances may be life-threatening.

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Dissociatives(Arylcyclohexylamines)

Quick Dosage

oral10–15 mg (common)

Total duration (oral)4hr–6hr

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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.

How 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(11)

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...
Dizziness— A sensation of spinning, swaying, or lightheadedness that impairs balance and spatial orientation, o...
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...
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...
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(6)

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...
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 suppression

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
3-MeO-PCE	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
3-MeO-PCMo	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
3-MeO-PCP	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
4-MeO-PCP	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
5F-AKB48	Caution	Cannabis can intensify dissociation and increase confusion and disorientation
5F-PB-22	Caution	Cannabis can intensify dissociation and increase confusion and disorientation
AB-FUBINACA	Caution	Cannabis can intensify dissociation and increase confusion and disorientation
Alcohol	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Alprazolam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Anandamide	Caution	Cannabis can intensify dissociation and increase confusion and disorientation
APICA	Caution	Cannabis can intensify dissociation and increase confusion and disorientation
Atropa belladonna	Caution	Unpredictable compounding of hallucinogenic effects with anticholinergic delirium
Baclofen	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Benzodiazepines	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Benzydamine	Caution	Unpredictable compounding of hallucinogenic effects with anticholinergic delirium
Cake	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Cannabidiol	Caution	Cannabis can intensify dissociation and increase confusion and disorientation
Cannabis	Caution	Cannabis can intensify dissociation and increase confusion and disorientation
Carisoprodol	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Clonazepam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Clonazolam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Clonidine	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Datura	Caution	Unpredictable compounding of hallucinogenic effects with anticholinergic delirium
Deschloroetizolam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Deschloroketamine	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
Dextromethorphan	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
Diazepam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Diclazepam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Diphenhydramine	Caution	Unpredictable compounding of hallucinogenic effects with anticholinergic delirium
Diphenidine	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
Ephenidine	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
Eszopiclone	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Etizolam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
F-Phenibut	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Flualprazolam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Flubromazepam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Flubromazolam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Flunitrazepam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Flunitrazolam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Gabapentin	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Gaboxadol	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
GBL	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
GHB	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Grayanotoxin	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
HXE	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
Inhalants	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
JWH-018	Caution	Cannabis can intensify dissociation and increase confusion and disorientation
JWH-073	Caution	Cannabis can intensify dissociation and increase confusion and disorientation
Ketamine	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
Lorazepam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Memantine	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
Mephenaqualone	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Methaqualone	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Methoxetamine	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
Methoxphenidine	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
Metizolam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Midazolam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Mirtazapine	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
MXiPr	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
Myristicin	Caution	Unpredictable compounding of hallucinogenic effects with anticholinergic delirium
Nicotine	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Nifoxipam	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Nitrous	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
O-PCE	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
PCE	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
PCP	Caution	Compounding dissociative effects can cause confusion, mania, and loss of motor control
Pentobarbital	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
Phenobarbital	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
SAMe	Caution	Both cause CNS depression; increased risk of vomiting, unconsciousness, and respiratory depression
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
1P-ETH-LAD	Low Risk & Synergy	Produces unique synergistic effects; often combined
1P-LSD	Low Risk & Synergy	Produces unique synergistic effects; often combined
1V-LSD	Low Risk & Synergy	Produces unique synergistic effects; often combined
2,5-DMA	Low Risk & Synergy	Produces unique synergistic effects; often combined
25B-NBOH	Low Risk & Synergy	Produces unique synergistic effects; often combined
25B-NBOMe	Low Risk & Synergy	Produces unique synergistic effects; often combined
25C-NBOH	Low Risk & Synergy	Produces unique synergistic effects; often combined
25C-NBOMe	Low Risk & Synergy	Produces unique synergistic effects; often combined
25D-NBOMe	Low Risk & Synergy	Produces unique synergistic effects; often combined
25E-NBOH	Low Risk & Synergy	Produces unique synergistic effects; often combined
25I-NBOH	Low Risk & Synergy	Produces unique synergistic effects; often combined
25I-NBOMe	Low Risk & Synergy	Produces unique synergistic effects; often combined
25N-NBOMe	Low Risk & Synergy	Produces unique synergistic effects; often combined
2C-B	Low Risk & Synergy	Produces unique synergistic effects; often combined
2C-B-FLY	Low Risk & Synergy	Produces unique synergistic effects; often combined
2C-C	Low Risk & Synergy	Produces unique synergistic effects; often combined
2C-D	Low Risk & Synergy	Produces unique synergistic effects; often combined
2C-E	Low Risk & Synergy	Produces unique synergistic effects; often combined
2C-H	Low Risk & Synergy	Produces unique synergistic effects; often combined
2C-I	Low Risk & Synergy	Produces unique synergistic effects; often combined
2C-P	Low Risk & Synergy	Produces unique synergistic effects; often combined
2C-T	Low Risk & Synergy	Produces unique synergistic effects; often combined
2C-T-2	Low Risk & Synergy	Produces unique synergistic effects; often combined
2C-T-21	Low Risk & Synergy	Produces unique synergistic effects; often combined
2C-T-7	Low Risk & Synergy	Produces unique synergistic effects; often combined
3C-E	Low Risk & Synergy	Produces unique synergistic effects; often combined
3C-P	Low Risk & Synergy	Produces unique synergistic effects; often combined
4-AcO-DET	Low Risk & Synergy	Produces unique synergistic effects; often combined
4-AcO-DiPT	Low Risk & Synergy	Produces unique synergistic effects; often combined
4-AcO-DMT	Low Risk & Synergy	Produces unique synergistic effects; often combined
4-AcO-MET	Low Risk & Synergy	Produces unique synergistic effects; often combined
4-AcO-MiPT	Low Risk & Synergy	Produces unique synergistic effects; often combined
4-HO-DET	Low Risk & Synergy	Produces unique synergistic effects; often combined
4-HO-DiPT	Low Risk & Synergy	Produces unique synergistic effects; often combined
4-HO-DPT	Low Risk & Synergy	Produces unique synergistic effects; often combined
4-HO-EPT	Low Risk & Synergy	Produces unique synergistic effects; often combined
4-HO-MET	Low Risk & Synergy	Produces unique synergistic effects; often combined
4-HO-MiPT	Low Risk & Synergy	Produces unique synergistic effects; often combined
4-HO-MPT	Low Risk & Synergy	Produces unique synergistic effects; often combined
5-MeO-DALT	Low Risk & Synergy	Produces unique synergistic effects; often combined
5-MeO-DiBF	Low Risk & Synergy	Produces unique synergistic effects; often combined
5-MeO-DiPT	Low Risk & Synergy	Produces unique synergistic effects; often combined
5-MeO-DMT	Low Risk & Synergy	Produces unique synergistic effects; often combined
5-MeO-MiPT	Low Risk & Synergy	Produces unique synergistic effects; often combined
6-APB	Low Risk & Synergy	Produces unique synergistic effects; often combined
AL-LAD	Low Risk & Synergy	Produces unique synergistic effects; often combined
ALD-52	Low Risk & Synergy	Produces unique synergistic effects; often combined
Allylescaline	Low Risk & Synergy	Produces unique synergistic effects; often combined
Ayahuasca	Low Risk & Synergy	Produces unique synergistic effects; often combined
Bromo-DragonFLY	Low Risk & Synergy	Produces unique synergistic effects; often combined
Bufotenin	Low Risk & Synergy	Produces unique synergistic effects; often combined
DET	Low Risk & Synergy	Produces unique synergistic effects; often combined
DiPT	Low Risk & Synergy	Produces unique synergistic effects; often combined
DMT	Low Risk & Synergy	Produces unique synergistic effects; often combined
DOB	Low Risk & Synergy	Produces unique synergistic effects; often combined
DOC	Low Risk & Synergy	Produces unique synergistic effects; often combined
DOI	Low Risk & Synergy	Produces unique synergistic effects; often combined
DOM	Low Risk & Synergy	Produces unique synergistic effects; often combined
DPT	Low Risk & Synergy	Produces unique synergistic effects; often combined
Efavirenz	Low Risk & Synergy	Produces unique synergistic effects; often combined
EPT	Low Risk & Synergy	Produces unique synergistic effects; often combined
Escaline	Low Risk & Synergy	Produces unique synergistic effects; often combined
ETH-LAD	Low Risk & Synergy	Produces unique synergistic effects; often combined
Ibogaine	Low Risk & Synergy	Produces unique synergistic effects; often combined
LAE-32	Low Risk & Synergy	Produces unique synergistic effects; often combined
LSA	Low Risk & Synergy	Produces unique synergistic effects; often combined
LSD	Low Risk & Synergy	Produces unique synergistic effects; often combined
LSM-775	Low Risk & Synergy	Produces unique synergistic effects; often combined
LSZ	Low Risk & Synergy	Produces unique synergistic effects; often combined
MDA	Low Risk & Synergy	Produces unique synergistic effects; often combined
Mescaline	Low Risk & Synergy	Produces unique synergistic effects; often combined
MET	Low Risk & Synergy	Produces unique synergistic effects; often combined
Methallylescaline	Low Risk & Synergy	Produces unique synergistic effects; often combined
MiPLA	Low Risk & Synergy	Produces unique synergistic effects; often combined
MiPT	Low Risk & Synergy	Produces unique synergistic effects; often combined
MPT	Low Risk & Synergy	Produces unique synergistic effects; often combined
PARGY-LAD	Low Risk & Synergy	Produces unique synergistic effects; often combined
PRO-LAD	Low Risk & Synergy	Produces unique synergistic effects; often combined
Psilocybin Mushrooms	Low Risk & Synergy	Produces unique synergistic effects; often combined

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.

AcetylfentanylDangerous