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.