NDP Stats & Data
Effect Profile
CuratedStrong euphoria and pain relief with strong itching/nausea, mild sedation
Tolerance & Pharmacokinetics
drugs.wikiNo 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
Harm Reduction
drugs.wikiNitazene opioids are frequently implicated in severe poisonings due to extreme potency and unexpected appearance in unregulated supplies, including fake medicines that mimic oxycodone/benzodiazepines; this raises overdose risk, especially in people without opioid tolerance. Naloxone reverses nitazene overdoses, but multiple sequential doses may be needed; always call emergency services and continue rescue breathing while awaiting help. Fentanyl test strips do not detect nitazenes, so a negative FTS does not rule out presence of NDP or other nitazenes. Drug checking services report nitazenes appearing where they are not expected (e.g., samples sold as oxycodone); treat all unknown powders/pills as potentially containing high‑potency opioids. Co‑exposure to other sedatives (illicit benzodiazepines) or veterinary α2‑agonists (e.g., xylazine, medetomidine) is increasingly common and can blunt response to naloxone or prolong sedation; airway support and medical care are critical even after naloxone. Because nitazenes may be present at very low concentrations, routine test kits and many FTS will miss them; laboratory drug checking is preferable where available. Doses at the microgram scale require calibrated equipment; volumetric dosing is strongly preferred to reduce measurement error. Avoid rapid redosing—some users report cumulative sedation with nitazenes over hours, increasing the risk of delayed respiratory depression. Given market variability and absent human pharmacokinetic data for NDP specifically, treat potency and duration as uncertain, start well below any published ranges, and avoid mixing with other depressants.
References
Cited references
- EUDA European Drug Report 2025 – New psychoactive substances (nitazenes trend, counterfeit pills, potency)
- EUDA EDR 2025 Highlights – Call to action on new synthetic opioids
- EUDA News 2024 – Nitazenes in fake medicines; benzo‑dope/tranq‑dope mixtures
- DrugWise – Nitazenes overview (overdose risk; naloxone may require multiple doses)
- Hi‑Ground nitazenes HR flyer (FTS do not detect nitazenes; detection at very low concentrations is difficult)
- Toronto Drug Checking Service – Nitazenes in non‑expected opioid samples (oxycodone, etc.)
- Toronto Drug Checking Service – Medetomidine in fentanyl supply (illustrates α2‑agonist co‑exposure)
- TripSit volumetric dosing calculator (general HR tool for microgram‑active drugs)
- Drug Users Bible – Volumetric dosing and microgram‑scale handling guidance
- Effect Index – Respiratory depression (opioids; interaction risks with other depressants)
- Reddit r/NovelOpioids – Community reports on N‑desethylprotonitazene’s subtle effects and accumulation risk (anecdotal)