What are alpha-PVP, MDPV and NEP?
This version has been translated from Polish and links to the relevant test kits have been added. In a life-threatening situation call 112. This article is informational and serves harm reduction. It does not encourage the use of psychoactive substances and does not replace medical advice.
They are cathinones, from the same chemical family as mephedrone, but with a longer and more compulsive profile than the MMC and CMC compounds most people mean when they say cathinone. Alpha-PVP and MDPV are pyrovalerones, known for strong redosing pressure and long duration; NEP is closer to the mephedrone side but has arrived in quantity only recently, going from a single sample to 146 across the services we track.
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They arrive inside other cathinones
Of 159 samples in this group, a third contained a second compound, and the pattern is unusual: they are mostly found mixed with the cathinones people actually ordered.
| Detected alongside | Samples |
|---|---|
| 2-MMC | 18 |
| 4-MMC | 15 |
| 4-CMC | 11 |
| Unknown | 9 |
| MDMA | 6 |
| Ketamine | 5 |
| Lidocaine | 3 |
That is the practical risk. Somebody buying 4-MMC and receiving a blend with alpha-PVP in it gets a longer, more compulsive experience than the one they dosed for, and no reagent will separate the two.
What a reagent settles here
Zimmermann is the anchor reagent for cathinones, with mecke, marquis and morris narrowing the field. They confirm you are in this family rather than holding a stimulant sold as one, which is the first thing to establish. Because the dose ranges differ between these compounds, pair that with a scale and, where it matters, a plate.
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Weigh them, and separate them
Because they are not interchangeable by weight and are being substituted for each other, the two tests that help here are a milligram scale and a TLC plate. The scale handles the dose, and the plate shows whether the powder is one compound or two.
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Questions?
Is alpha-PVP the same as mephedrone?
Same family, different subgroup. Alpha-PVP is a pyrovalerone, with a longer duration and stronger redosing pressure.
What is NEP?
N-ethylpentedrone, a cathinone that has appeared in quantity recently, going from one published sample to 146 across the services we compared.
Can a reagent tell them apart?
No. It indicates that a cathinone is present. Separating them needs chromatography or a laboratory.
Why are they mixed into other cathinones?
Availability and price. The consequence for the buyer is a different duration from the one they dosed for.