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

    4-FEA

    Aliases: P-fluoroethamphetamine, 4-fluoroethylamphetamine, Para-fluoroethamphetamine

    Stimulant Research-chemical

    Summary TheDrug.Wiki TripSit

    4-FEA is the ethyl analogue of 4-FA with strong serotonergic properties. Limited formal pharmacological research exists; batch-to-batch variability is high. The compound is intensely serotonergic and may produce significant after-effects including headaches and cardiovascular strain.

    Dose Information TheDrug.Wiki TripSit

    ROA Light Common Strong Heavy
    Oral 25-50mg 50-75mg 75-150mg 150mg+
    Light Common Strong Heavy

    Onset, Duration & After-effects TheDrug.Wiki TripSit

    ROA Onset Comeup Peak Offset After Effects Total
    Oral 20-45 min 30-60 min 1-3 hrs 1-2 hrs 1-12 hrs 2.8-6.8 hrs
    Insufflated 5-15 min 15-30 min 1-2 hrs 1-2 hrs 1-12 hrs 2.3-4.8 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

    Empathogen 5.0
    Moderate+ 5/10

    Moderate stimulation, sensory enhancement, and euphoria with low empathy

    Empathy / Social Openness ×3
    3
    empathy, affection, and sociability enhancement
    Euphoria / Mood Elevation ×2
    6
    cognitive euphoria euphoria
    Stimulation ×1
    7
    stimulation wakefulness teeth grinding increased heart rate
    Sensory Enhancement ×1
    7
    tactile enhancement color enhancement increased libido
    Stimulant 4.8
    Moderate+ 5/10

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

    Stimulation / Energy ×3
    6
    stimulation wakefulness alertness enhancement
    Euphoria / Mood Lift ×2
    7
    cognitive euphoria euphoria motivation enhancement
    Focus / Productivity ×2
    3
    thought acceleration motivation enhancement
    ⚠ Anxiety / Jitters ×1
    10
    anxiety teeth grinding increased heart rate vasoconstriction sweating
    Based on reports from:
    Erowid Experience Reports PsychonautWiki 4-FEA
    View methodology →

    Tolerance

    Build-up develops over days to weeks of regular use
    Reset 3–7 days for acute; 1–3 weeks for full reset

    Tolerance Decay

    Full tolerance 3d Half tolerance 14d Baseline ~42d

    Extrapolated from MDMA/4‑FA user patterns: tolerance builds quickly with serotonergic releasers and decays over weeks. Leave several weeks to months between sessions to reduce tolerance and potential neurochemical stress. Data quality is anecdotal.

    Cross-Tolerances

    MDMA
    60%
    4-FA
    70%
    amphetamine
    40%

    Effects TheDrug.Wiki

    Positive
    • Stimulation
    Negative
    • Pupil dilation
    • Increased perspiration
    • Teeth grinding
    • Headaches
    • Increased heart rate
    • Vasoconstriction
    • Insomnia
    • Sweating
    Neutral
    • Decreased appetite
    Positive
    • Cognitive euphoria
    • Empathy, affection, and sociability enhancement
    • Wakefulness
    • Alertness enhancement
    • Euphoria
    • Motivation enhancement
    Negative
    • Anxiety
    Neutral
    • Talkativeness
    • Time distortion
    • Thought acceleration
    Positive
    • Increased music appreciation
    • Tactile enhancement
    • Increased libido
    • Tracers
    • Color enhancement
    • Pattern recognition enhancement
    Negative
    • Light sensitivity
    • Dehydration
    • Appetite suppression
    • Disinhibition

    Combinations TripSit

    4-FEA's nerd page Pharmacology, chemical data, effect profiles, and more
    →

    Helpful Links

    📘 Experience Reports 📖 TheDrug.Wiki 📖 TripSit 📖 PsychonautWiki