I've taken it several times. It's a stimulant so it can have those stimulant effects, but it's not super speedy to me-- just an extra pep in your step and motivation. I've exceeded dosing recommendations but I can't remember the highest I took. Stimulants aren't really my thing but I found phentermine did ok for me, it didn't seem to increase anxiety too much and it put me at a good place to get work done. I think I snorted it once or twice but I can't remember for sure so it must not have been too remarkable. Like others said, if you tell us more what you're looking to find out maybe we can be more specific with helping you. Be safe!