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    4F-PHP molecular structure

    4F-PHP Stats & Data

    4-fluoro-alpha-php 4-fluoro-pyrrolidinohexanophenone
    NPS DataHub
    MW263.36
    FormulaC16H22FNO
    CAS2230706-09-7
    IUPAC1-(4-fluorophenyl)-2-pyrrolidin-1-ylhexan-1-one
    SMILESCCCCC(N1CCCC1)C(=O)c1ccc(F)cc1
    InChIKeyBCJXLSGKMNRRKO-UHFFFAOYSA-N
    Phenethylamines; Cathinones; 2020/1. Von 2-Phenethylamin abgeleitete Verbindungen; 2021/1. Von 2-Phenethylamin abgeleitete Verbindungen; 2022/1. Von 2-Phenethylamin abgeleitete Verbindungen
    Chemical Class Amphetamine
    Psychoactive Class Stimulant
    Half-Life Unknown in humans; duration suggests several-hour active phase. Estimates of 4–8 h are inferred from related pyrrolidinophenones (e.g., α‑PVP/α‑PHP) but formal PK data for 4F‑PHP are lacking.

    Receptor Profile

    Receptor Actions

    Inhibitors
    Dopamine-norepinephrine reuptake inhibitor (DNRI)

    Effect Profile

    Curated + 1 Reports
    Stimulant 5.4

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

    Stimulation / Energy×3
    3
    Euphoria / Mood Lift×2
    10
    Focus / Productivity×2
    7
    Anxiety / Jitters×1
    10

    Tolerance & Pharmacokinetics

    drugs.wiki
    Half-Life
    Unknown in humans; duration suggests several-hour active phase. Estimates of 4–8 h are inferred from related pyrrolidinophenones (e.g., α‑PVP/α‑PHP) but formal PK data for 4F‑PHP are lacking.
    Addiction Potential
    High. Pyrrolidinophenone cathinones (e.g., α‑PVP/α‑PHP) are widely reported to produce strong compulsive redosing and problematic binges with insomnia; multiple user reports describe habituation and difficulty stopping once initiated.

    Tolerance Decay

    Full tolerance 2d Half tolerance 3d Baseline ~10d

    Tolerance develops rapidly with repeated doses/binges and partially subsides over several days; full return to baseline typically requires 1–2+ weeks after heavy use. Data are largely anecdotal from user communities and extrapolated from related pyrrolidinophenones.

    Cross-Tolerances

    Other cathinones (esp. pyrrolidinophenones)
    60% ●○○
    Other stimulants (e.g., amphetamine, methylphenidate)
    40% ●○○

    Experience Report Analysis

    Erowid
    1 Reports
    2018–2018 Date Range
    1 With Age Data

    Demographics

    Gender Distribution

    Age Distribution

    Reports Over Time

    Real-World Dose Distribution

    62K Doses

    From 1 individual dose entries

    Harm Reduction

    drugs.wiki

    HARM REDUCTION RATIONALES (evidence-backed): 1) Identity and potency are often uncertain in the cathinone market and mislabeling is common; pyrrolidinophenones like α‑PVP are frequently found in products sold as other cathinones. Prefer GC/MS drug checking where available; field reagents can only ‘rule in/out’ and cannot confirm identity or purity. Start with a very low test dose. Evidence: Saferparty drug-checking warnings documenting frequent cathinone mislabeling, including α‑PVP substituted for 3‑MMC/4‑MMC; and Erowid’s drug checking guidance stating reagents do not confirm identity. 2) Acute medical risks for substituted cathinones include tachycardia, hypertension, hyperthermia, agitation, seizures, and rhabdomyolysis with potential kidney injury. Avoid physical exertion and hot environments; actively manage temperature (cool environment, rest) and use small, spaced doses. Evidence: clinical/HR review for synthetic cathinones summarizing ED presentations (high neurologic/cardiovascular involvement) and rhabdomyolysis reports. 3) Psychosis and severe anxiety/paranoia are more likely with high doses, frequent redosing, and sleep deprivation. Plan session length, avoid overnight binges, and stop redosing early enough to allow sleep (consider sleep hygiene rather than stacking depressants). Evidence: α‑PVP experience categories on Erowid highlighting ‘Addiction & Habituation’ and ‘Health Problems’; Drugs‑Forum psychosis overview. 4) Compulsive redosing is common with pyrrolidinophenones. Pre-portion doses, lock away the remainder, and set timers (e.g., ≥2–3 h between doses); consider end‑time and a single redose cap. Evidence: numerous α‑PVP user reports describing binges and difficulty stopping. 5) Avoid ‘speedballing’ (stimulants with opioids) and mixing with other stimulants; MAOI combinations are high‑risk (hypertensive crisis). Use TripSit combination guidance for conservative defaults. Evidence: TripSit combination chart guidance and HR materials. 6) Nasal use is often irritating/corrosive; use your own equipment, consider saline rinses afterward, and avoid frequent lines to reduce epistaxis and mucosal damage. Evidence: Saferparty HR advisories for sniffing hygiene. 7) Hydration should be moderate with electrolytes (avoid both dehydration and overhydration). Monitor urine color and body temperature; dark urine, severe muscle pain/rigidity, or confusion warrant urgent medical care. Evidence: cathinone toxicity reviews citing hyperthermia/rhabdomyolysis. 8) Vaping/smoking is reported by some but is associated anecdotally with harsh pulmonary irritation and difficult‑to‑control dosing; avoid inhalational ROAs especially with unknown batch identity. Evidence: Bluelight/Reddit user reports for MDPHP/4F‑PHP noting cough/irritation; no safety data. 9) Use an accurate milligram scale or volumetric solutions; do not eyeball. Evidence: general HR best practice and frequent mislabeling/potency variability documented by drug checking services. 10) Given uncertain serotonergic activity across mislabeled ‘4F‑PHP’ products, be cautious with serotonergic agents (SSRIs/SNRIs, DXM, tramadol) and watch for serotonin toxicity signs even if risk is low with strictly dopaminergic/noradrenergic cathinones. Evidence: cathinone clinical reviews and TripSit combinations. Citations at end.

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