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    Isotonitazepyne Stats & Data

    Npi Iso-pyne
    NPS DataHub
    MW444.96
    FormulaC23H29ClN4O3
    IUPAC2-(4-Isopropoxybenzyl)-5-nitro-1-(2-(pyrrolidin-1-yl)ethyl)-1H-benzo[d]imidazole hydrochloride
    SMILES[Cl-].CC(C)Oc1ccc(cc1)Cc1nc2cc(ccc2n1CCN1CCCC1)N(=O)=O.[H+]
    InChIKeyIRSBLNVYYWAJDB-UHFFFAOYSA-N
    Opioids
    Chemical Class Benzimidazole opioid
    Psychoactive Class Depressant

    Effect Profile

    Curated
    Opioid 7.3

    Strong euphoria and pain relief with strong itching/nausea, mild sedation

    Euphoria / Warmth×3
    10
    Analgesia×2
    8
    Sedation / Relaxation×1
    5
    Itching / Nausea×1
    10

    Tolerance & Pharmacokinetics

    drugs.wiki
    Half-Life
    Estimated short elimination (few hours) with rapid receptor re-occupancy; no formal human PK published for isotonitazepyne. Use short‑acting assumptions and avoid frequent redosing.
    Addiction Potential
    Very high – rapid dependence possible; intense withdrawal may begin within hours; repeated naloxone dosing often required during overdose reversal.

    No tolerance chart. Our decay curves for opioids were estimates, and a curve can make tolerance look longer-lasting than it is, which is the dangerous direction.

    Opioid tolerance drops fast when you stop, and even a few days off can be enough, so a dose that used to be normal can now stop your breathing. Overdose deaths rise sharply after prison, detox or leaving treatment, and tolerance also falls during a hospital stay. After any break, start with a much smaller amount, try a test dose first, don't use alone, and keep naloxone within reach. Alcohol, benzodiazepines, gabapentinoids and other sedatives make an opioid overdose much more likely.

    Sources: FRANK: heroin · National Harm Reduction Coalition · WHO: opioid overdose · Merrall et al. 2010 · Binswanger et al. 2007 · Strang et al. 2003 · FDA 2019: gabapentinoids and breathing

    Cross-Tolerances

    Other benzimidazole opioids (nitazenes)
    Fentanyl analogues

    Harm Reduction

    drugs.wiki

    Identity and class: Isotonitazepyne (N-pyrrolidino isotonitazene) is a benzimidazole nitazene opioid; PubChem CID 168322631 confirms structure and identifiers. Counterfeit risk: Drug-checking programs have repeatedly detected isotonitazepyne/protonitazepyne in fake “oxycodone/percocet” tablets; assume any non‑pharmacy tablet may contain nitazenes. Market alerts: EU drug monitoring reports document rising nitazene involvement in poisonings and widespread appearance in fake medicines across multiple EU countries. Test strips: Standard fentanyl test strips do not detect nitazenes; rely on lab drug checking or nitazene-specific methods where available. Onset and redosing: Some nitazenes show a short but sometimes delayed onset; wait at least 10–15 minutes after an insufflated test dose before any redose to reduce stacking risk. Overdose response: Expect profound respiratory depression; multiple 2–4 mg intranasal naloxone doses at 2–5 min intervals may be required, and recurrent sedation can occur—call emergency services and monitor continuously. Polysubstance risk: Benzodiazepines, alcohol, barbiturates, Z‑drugs, GHB/GBL and gabapentinoids synergistically worsen CNS/respiratory depression; avoid mixing. Adulterant co-exposures: In current markets, opioids are frequently combined with veterinary sedatives (xylazine, medetomidine) and/or benzodiazepines, further increasing overdose risk. Dosing method: Active in double‑digit micrograms—use volumetric dosing (e.g., dissolve a known amount into a measured volume, label clearly, and use an oral or nasal metered syringe) to avoid lethal error; avoid handling loose powder and prevent cross‑contamination. Naloxone access: Carry take‑home naloxone; many EU countries and local services now provide it—seek training. Avoid smoking/vaping: Pyrolysis behavior and delivered dose are unpredictable for nitazenes; inhalation can cause rapid overdose—safer routes remain those allowing measured dosing (e.g., diluted nasal sprays). [inference from general high‑potency opioid handling and drug‑checking cautions]. Do not use alone: Use with a trusted, naloxone‑trained person present and avoid using in isolation; consider supervised consumption where available.

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