I have done DXM in Syrup from Boots & also Pure DXM Powder, I lack this "Dextromethorphan is a nonopioid antitussive metabolized by cytochrome P450 2D6 (CYP2D6) to an active metabolite, dextrorphan. CYP2D6 is polymorphically expressed in humans, with 5 to 10% of Caucasians being homozygous deficient for the active form of the enzyme." so when I do DXM it doesn't break down right in my body, the first time I did pure DXM it did nothing & I did nearly a gram, the next time I did 300mg & was so fucked it is beyond words.
It is HORRIBLE, truly the worst & gutter high possible, it makes you itch so badly but NOT like a good hit of Heroin, it is more the itch you get from an allergic reaction, it takes your Ego & dumps a flaming bag of Dog shit on it but NOT in a nice way, it is just truly horrible.
When you have come down it has the same kind of feeling you have when done a ton of N2) in you can feel the damage in your brain, you feel slow & a bit like a comedown from Glue, the only thing I am cautious of is Salvia but DXM & in my case DXO is something I REFUSE 100% to ever do again.
If you are going to try it go ahead but DON'T go into it thinking it is anything like the usual suspects such as Ketamine etc.......