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Ephylone Facts

Stimulant; Entactogen; Substituted cathinone; Dopamine releasing agent

Description

Ephylone (N-ethylpentylone) is a synthetic stimulant of the substituted cathinone class. It blocks the recycling of dopamine, norepinephrine, and serotonin, producing the stimulation and euphoria that define its effects.[1]

Subjective effects include euphoria, stimulation, wakefulness, mild empathogenic warmth, and increased energy. The experience is stimulant-dominant — a surge of drive and energy with a thin layer of warmth that falls well short of MDMA's emotional depth.[2]

Ephylone carries high dependence potential and significant toxicity, linked to 151 overdose deaths in the United States between 2015 and 2018.[3][4][5] The gap between an active and dangerous dose is narrow, and the pharmacological drive to redose pushes toward cardiovascular collapse and dangerous overheating.[6][7]

Dose and durationby route · individual sensitivity varies

Oral(mg)
Threshold< 5 mgLight10 – 20 mgCommon20 – 40 mgStrong40 – 80 mgHeavynot recorded

Starts in 15 – 30 minLasts 4 – 8 hoursAfter-effects 6 – 24 hours

Body and dependence

Acute toxicity
High
Chronic toxicity
Moderate
Physical dependence
Moderate
Psychological dependence
High
Withdrawal
Moderate
Compulsive redosing
High

Tolerance

Builds
Moderate
Fully resets after
Not recorded
Carries over to
cocaine; amphetamine; MDPV; methylone; mephedrone; eutylone

Effectslikely at a common dose

Perception
none likely · 6 possible
Body
Appetite suppression; Body high; Insomnia; Physical fatigue; Stimulation; Wakefulness; +22 possible, including Heart rate perception changes, Vasoconstriction, Bruxism
Thinking
none likely · 26 possible, including Compulsive redosing urge, Decision impairment, Cognitive dysphoria
Feeling
Emotional enhancement; Euphoria; +11 possible, including Anxiety, Anhedonia, Depression
Self
none likely · 9 possible, including Craving, Compulsive repetitive behavior
Time
none likely · 2 possible
Awareness
none likely · 1 possible

Who shouldn't take it

Absolute
Pre-existing cardiovascular disease; Pregnancy and lactation; MAO inhibitors
Relative
Seizure disorders; Hepatic impairment; Hyperthermia-prone conditions; Concurrent serotonergic medication

Combinations61 recorded

Lethal (2)
MAOIs; Tramadol
Dangerous (33)
Alpha-2 adrenergic receptor antagonist; Anticholinergics; Atypical antipsychotics; Caffeine; Dopamine agonists; Ephedrine, Pseudoephedrine; Local anesthetics; MDMA, Amphetamines; MDMA, MDA; NDRIs (Wellbutrin); NRIs; Opioids; SNRIs; SSRIs; Stimulants; 5-HTP, Tryptophan; Antihistamines; Antipsychotics; Buspirone; Clonidine, Guanfacine; DXM; GHB, Baclofen; GHB, GBL; Ibogaine; and 9 more, see full page
Caution (23)
See full page: psychedex.org/substances/ephylone
Not graded (3)
Not listed never means safe.

Seek help immediately if

  • Overheating / very high body temperature — heavy sweating, then hot dry skin (the leading cause of MDMA deaths, worse when dancing in hot venues)
  • Muscle rigidity, jaw clenching, tremor, or twitching (possible serotonin syndrome)
  • Fast, pounding heartbeat; chest pain
  • Agitation, confusion; seizures
  • Hyponatremia (water intoxication) — headache, confusion, drowsiness, vomiting, and seizures from drinking too much water
  • Nausea/vomiting; collapse or unconsciousness

What to do

  1. Move them somewhere cool and help them cool down — overheating is the main danger
  2. Sip water to stay hydrated but DO NOT overdrink — roughly a cup (250 ml) per hour if active; too much water can be deadly (hyponatremia)
  3. Get them to rest and stop dancing
  4. For overheating, seizures, chest pain, muscle rigidity/tremor, confusion, or unresponsiveness, call emergency services
  5. Recovery position if drowsy or vomiting; stay with them
  6. Be ready to give rescue breaths / CPR

Most resolve with cooling, rest, sensible hydration, and time. The life-threatening dangers are hyperthermia, serotonin syndrome, and hyponatremia (too much water) — each a medical emergency, not something to wait out.

988 Suicide & Crisis LifelineFireside Project: 62-FIRESIDE

Version r1 · Not medical advice

References

  1. [1]
    ^Costa JL, Cunha KF, Lanaro R, Cunha RL, Walther D, Baumann MH (2019) Analytical quantification, intoxication case series, and pharmacological mechanism of action for N-ethylnorpentylone (N-ethylpentylone or ephylone). — Drug Testing and Analysis doi:10.1002/dta.2502
  2. [2]
    ^Banister SD, Kevin RC (2018) Weekly Dose: ephylone, the dangerous designer stimulant found at Groovin the Moo — The Conversation Link
  3. [3]
    ^US DEA (2018) Temporary Placement of N-Ethylpentylone in Schedule I Link
  4. [4]
    ^Espinosa-Velasco M, Reguilón MD, Bellot M, Nadal-Gratacós N, Berzosa X, Puigseslloses P, Gómez-Canela C, Rodríguez-Arias M, Pubill D, Camarasa J, Escubedo E, López-Arnau R (2022) Behavioural and neurochemical effects after repeated administration of N-ethylpentylone (ephylone) in mice. — Journal of Neurochemistry doi:10.1111/jnc.15542
  5. [5]
    ^Chen LC, Chan MH, Chen HH (2024) Comparative Assessment of the Addictive Potential of Synthetic Cathinones by Zebrafish Conditioned Place Preference (CPP) Paradigm — Life (Basel) doi:10.3390/life14070820
  6. [6]
    ^Zawadzki M, Nowak K, Szpot P (2019) Fatal intoxication with N-ethylpentylone: a case report and method for determining N-ethylpentylone in biological material — Forensic Toxicology doi:10.1007/s11419-019-00483-0
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