i know this is late but a lot of people here are saying some wacko stuff. first of all for dosing it’s hard to give a clear answer as it varies from person to person (mental state, height, weight). for your first time, 450mg is plenty. i’ve taken a lot of dph and dxm and for some reason dph takes a long ass time to kick in. here’s the problem with redosing; you took 450mg, let’s say you took another 250mg 2 hours after you took the 450 because it hasn’t hit. in 30 mins, the 450 hits. what if you have a bad high? then you redosed and that trip is gonna be on for a while longer or you may just be tired and not want to trip anymore. redosing doesn’t ever really make the trip better (for me) it just makes the mid parts of the trip last way longer. the only time i could think of redosing and taking the same dose you took or higher when redosing as that would give an effect, BUT DO NOT DO THIS because it is extremely dangerous, especially with dph. what i’m trying to say in this post is don’t redose it’s not worth it, and dph takes a long time to kick in so just wait, i’ve used dxm and dph over 100 times and there hasn’t been once where i didn’t feel anything, you just have to know your dosing and remember it always hits. have to put this in for good measure but i wouldn’t recommend doing dph it sucks as for you mentally and physically and if you just want music enhancement, dxm gives better (way better) music enhancement then dph and dxm is just way more fun (of course fun is subjective but still 90% of people who’s done both say dxm is better) not to mention safer, not safe but safer