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

    Ephenidine

    Aliases: Epe, Nedpa

    Dissociative Research-chemical

    Summary TheDrug.Wiki TripSit PsychonautWiki

    Ephenidine is a potent NMDA receptor antagonist with dissociative effects similar to ketamine but with longer duration. Heavy doses readily cause amnesia, blackouts, and loss of motor control. Start with low doses as it has the highest NMDA receptor affinity among diarylethylamines.

    Perspectives

    “I love this stuff. It is like dissociative 2C-B or LSD. It is easily the most psychedelic and most visual dissociative I have taken, and I love it! The visuals are spectacular, colorful, beautiful, complex and organic.”

    “Whilst this is probably my favourite member of this class, its status as a relatively unknown research chemical has deterred anything other than very occasional use.”

    Dose Information TheDrug.Wiki TripSit PsychonautWiki

    ROA Light Common Strong Heavy
    Oral 30-70mg 70-100mg 100-150mg 150mg+
    Light Common Strong Heavy

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

    ROA Onset Comeup Peak Offset After Effects Total
    Oral 10-30 min 30-60 min 1-3 hrs 2-4 hrs 2-6 hrs 5-7 hrs
    Rectal 10-19 min 19-40 min 1-3 hrs 2-4 hrs 2-6 hrs 3-6 hrs

    Effect Profile

    16 reports

    Scores (1–10) curated from multiple sources:

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

    Full methodology

    Dissociative 7.1
    Strong+ 7/10

    Strong dissociative depth, mania, insight, and motor impairment

    Dissociative Depth ×3
    10
    depersonalization derealization consciousness disconnection tactile disconnection physical disconnection visual disconnection +6 more
    ⚠ Mania / Compulsion ×1
    10
    compulsive redosing thought acceleration disinhibition stimulation
    Insight / Novel Thought ×2
    10
    conceptual thinking analysis enhancement perspective alterations unity and interconnectedness perspective distortions
    ⚠ Motor / Sensory Impairment ×1
    10
    motor control loss tactile disconnection physical disconnection tactile suppression numbness spatial disorientation +2 more
    Based on reports from:
    Effect Index The Polychrome Sea Bluelight Big & Dandy Thread Erowid Experience Reports PsychonautWiki Ephenidine The Drug Users Bible Ephenidine
    View methodology →

    Tolerance

    Build-up develops with repeated use over days to weeks
    Reset 2–4 weeks for noticeable reduction

    Tolerance Decay

    Full tolerance 3d Half tolerance 7d Baseline ~14d

    Estimates reflect strong, rapid cross-tolerance typical of NMDA antagonists; values are extrapolated from dissociative literature and user reports rather than controlled human PK studies.

    Cross-Tolerances

    Ketamine
    60%
    Methoxetamine (MXE)
    60%
    Diphenidine and related diarylethylamines
    70%

    Effects Erowid

    Aggregated from 16 Erowid experience reports

    Positive Effects 9

    Stimulation 68.8% 70%
    Euphoria 56.2% 70%
    Color Enhancement 50.0% 70%
    Music Enhancement 50.0% 70%
    Focus Enhancement 43.8% 70%
    Empathy 37.5% 70%
    Body High 31.2% 70%
    Tactile Enhancement 25.0% 70%
    Pain Relief 18.8% 70%

    Adverse Effects 5

    Anxiety 50.0% 70%
    Confusion 43.8% 70%
    Nausea 31.2% 70%
    Motor Impairment 31.2% 70%
    Memory Suppression 18.8% 70%

    Combinations TripSit

    Trip Reports Effect Index

    The Polychrome Sea nervewing
    Ephenidine's nerd page Pharmacology, chemical data, effect profiles, and more
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    Helpful Links

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