Had a heavy night on this drug, night before last. Posted my experience on a similar drug forum site, down to me being lazy and not wanting to read through every page here, I will copy and paste what I posted on that forum as my experience and a warning/guideline for what I found when taking this amazing, volatile drug, 3-FPM
This comment will be short and uninformative as most of what I have to say can be noted from previous comments in this thread, before I tried this drug for the first time (as a replacement for speed, as it's near impossible to get where I live) I checked this thread, I'm quite a heavy user really and I didn't see anywhere, whether anybody had stated a dosage NOT to go over, I can say after my experience last night and yesterday, I can give a guideline for anybody out there who wants to take a ridiculous amount.
I took over the course of 4 hours around the 500mg mark, a mix of bombing (in gel capsules) and snorting (which I will state, as a few have said above, STINGS LIKE HELL) however the high is incredibly almost identical to speed just more euphoric and sadly doesn't last as long, I also experienced no comedown effects I dread when using amphetamine. I am male, 20 years old, about 6'1 and 70kg, with the dose I took I ended up at the hospital that night, from what I can remember, I collapsed for around 30 mins after my heart rate surged from its usual 60-70bpm, to a whopping 150+ (minimum) I had symptoms of a heart attack and the only thing I can truly remember about those agonising 30 minutes were the cold, and I felt seconds away from death.
Around 12 hours later it jumped into my mind what happened after wondering why I had chest pains, upon arrival and a few tests two doctors agreed I shouldn't be alive
Now I'm all for this drug, it's a cross between speed and MDMA, and with no experienced comedown, just DO NOT PUSH THE LIMITS, if you feel your heart rate starting to rise I highly suggest you stop or you might end up like I did, or worse. Just a warning because I didn't find a post on here stating what sort of dosage was too much, now anybody reading this knows
tl;dr - 500-700mg proved almost fatal, high feels like speed/mdma cross-breed, no comedown feelings but noticeable decrease in short term memory - Other than this, a rather spectacular stimulant to snort or bomb
