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    🧪 This is a research chemical with limited data on its long-term health effects, toxicity profile, and safe dosage ranges.

    4F-EPH

    Aliases: 4f-tep, 4-fluoroethylphenidate, 4-feph

    Stimulant Research-chemical

    Summary TheDrug.Wiki TripSit PsychonautWiki

    4F-EPH is a novel research chemical with minimal human use history and unknown long-term toxicity. First reported death occurred in 2016 involving polydrug use. The substance is notably less caustic to nasal cavities than ethylphenidate but still causes mild to moderate damage with intranasal use; users should perform sterile saline nasal rinses after insufflation.

    Dose Information TheDrug.Wiki TripSit PsychonautWiki

    ROA Light Common Strong Heavy
    Oral 5-10mg 10-15mg 15-30mg 30mg+
    Light Common Strong Heavy

    Onset, Duration & After-effects TheDrug.Wiki TripSit PsychonautWiki

    ROA Onset Peak After Effects Total
    Oral 10-25 min 2-3 hrs 1-12 hrs 2.2-3.4 hrs

    Effect Profile

    Scores (1–10) curated from multiple sources:

    • Effect keyword matching from PsychonautWiki catalog
    • Weighted by importance: core (×3), major (×2), minor (×1)

    Full methodology

    Stimulant 5.9
    Strong 6/10

    Strong anxiety/jitters and focus with moderate euphoria, mild stimulation

    Stimulation / Energy ×3
    5
    stimulation wakefulness
    Euphoria / Mood Lift ×2
    7
    physical euphoria cognitive euphoria motivation enhancement
    Focus / Productivity ×2
    9
    focus enhancement analysis enhancement thought acceleration motivation enhancement
    ⚠ Anxiety / Jitters ×1
    10
    anxiety increased heart rate teeth grinding vasoconstriction
    Based on reports from:
    Erowid Experience Reports PsychonautWiki 4F-EPH The Drug Users Bible 4F-EPH
    View methodology →

    Tolerance

    Build-up develops rapidly after a single use (serotonergic psychedelic)
    Reset 7–14 days for baseline

    Tolerance Decay

    Full tolerance 1h Half tolerance 10d Baseline ~14d

    Effects TheDrug.Wiki PsychonautWiki

    Positive
    • Stimulation
    • Physical euphoria
    Negative
    • Pupil dilation
    • Vasoconstriction
    • Increased heart rate
    • Increased blood pressure
    • Teeth grinding
    • Temporary erectile dysfunction
    Neutral
    • Spontaneous bodily sensations
    • Nasal damage
    • Stamina intensification
    Positive
    • Cognitive euphoria
    • Focus enhancement
    • Empathy, affection, and sociability enhancement
    • Motivation enhancement
    • Analysis enhancement
    • Wakefulness
    Negative
    • Depression
    • Anxiety
    • Irritability
    • Thought deceleration
    • Cognitive fatigue
    • Motivation depression
    Neutral
    • Thought acceleration
    • Focus intensification
    Positive
    • Increased music appreciation
    • Increased libido
    • Perception of bodily lightness
    Negative
    • Appetite suppression
    • Dehydration
    • Decreased libido
    • Orgasm depression
    • Light sensitivity
    • Appetite Suppression
    Neutral
    • Spontaneous physical sensations
    4F-EPH's nerd page Pharmacology, chemical data, effect profiles, and more
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    Helpful Links

    📘 Experience Reports 📖 TheDrug.Wiki 📖 TripSit 📖 PsychonautWiki 📖 The Drug Users Bible