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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-Fluoromethylphenidate

    Aliases: 4-fmph, 4-fl-mph, 4-fluoro-mph, 4f-mph, 4fmph

    Categories

    Stimulant Research-chemical
    4-Fluoromethylphenidate structure

    Summary TheDrug.Wiki TripSit PsychonautWiki

    4F-MPH is a potent functional stimulant with a steep dose-response curve requiring careful dosing. It is 2-3 times more potent than methylphenidate as a dopamine and norepinephrine reuptake inhibitor. Effects are characterized by long-lasting stimulation with variable euphoria that typically manifests only in the first 1-2 hours. The substance is known for promoting focus and productivity at lower doses, but higher doses can cause forced stimulation, anxiety, and physical discomfort. Use proper harm reduction practices and start with low doses due to individual sensitivity variations.

    Dose Information TheDrug.Wiki TripSit PsychonautWiki

    ROA Light Common Strong Heavy
    Oral 5-10mg 10-15mg 15-20mg 20mg+
    Insufflated 5-8mg 8-14mg 14-20mg 20mg+
    Light Common Strong Heavy

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

    ROA Onset Comeup Peak Offset After Effects Total
    Oral 20-40 min 30-60 min 2-4 hrs 2-3 hrs 2-6 hrs 240-0 min
    Insufflated 5-10 min 10-20 min 1.5-3 hrs 1-2 hrs 2-4 hrs 240-0 min

    Tolerance

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

    Effects TheDrug.Wiki PsychonautWiki

    Positive
    • Stimulation
    Negative
    • Teeth grinding
    • Nausea
    • Vasoconstriction
    • Pupil dilation
    • Increased heart rate
    • Increased perspiration
    • Abnormal heartbeat
    • Increased Heart Rate
    Neutral
    • Spontaneous bodily sensations
    Positive
    • Focus enhancement
    • Motivation enhancement
    • Cognitive euphoria
    • Analysis enhancement
    • Wakefulness
    • Memory enhancement
    Negative
    • Anxiety
    • Emotion suppression
    • Dizziness
    • Depression
    • Irritability
    • Thought deceleration
    • Compulsive redosing
    • Cognitive fatigue
    • Motivation depression
    Neutral
    • Thought organization
    • Time distortion
    • Thought acceleration
    • Ego inflation
    • Suggestibility suppression
    • Focus intensification
    Positive
    • Increased music appreciation
    • Increased libido
    Negative
    • Appetite suppression
    • Dehydration
    • Light sensitivity
    • Appetite Suppression
    • Double vision
    • Disinhibition
    Neutral
    • Increased sexuality
    • Visual and auditory hallucinations

    Helpful Links

    📘 Experience Reports 📖 PsychonautWiki 📖 TripSit