4-FPD: A New Psychoactive Substance: What it is and how to test for it
Posted on 31 March, 2021 · 3 Minute Read

What are 4-FPD’s effects and known health risks?
4-fluoropentedrone (4-FPD) has been around a while, but has remained in relative obscurity throughout its time on the market such that we have struggled to find much relevant information.

What we can tell you is that it has a relatively low dose-window and the few who have attempted it haven’t really been fans. If you have any experience/knowledge about it, we would love to hear from you so that we can update this page accordingly.

From here, we’ll need to get a bit theoretical. Halogenating stimulants (adding a chlorine, fluorine or brome atom) has been a go-to process for clandestine chemists for years, and has produced some of the biggest stars of the research chemical world (4-FA, for example). However, these are rarities compared to the many mediocre-to-poor results of which 4-FPD appears to be one.

It is unlikely to be drastically different to regular pentedrone in its basic effects, but the halogenation process can affect binding efficacy such that the “balance” of receptor activity is altered, causing an equivalent dose to be more or less stimulating or euphoric.

What are the testkit results for this substance?
This can make it pretty difficult to be sure if you’re actually getting 4-FPD as opposed to any number of other substances that could be used in its place, which is why it’s so handy that we’ve run the world’s first lab-backed reagent tests on our samples to give you a reference for your own tests. Only 2 of our reagents elicited any response from 4-FPD, which are shown below.

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