You can buy dxm over the counter. Its cough syrup. Can be taken in gel caps or syrup or you can snort it if you buy it off the streets or do some weird shit to the syrup i dont know about.
Its the dextrometherphan that gets you high. Take robotussin (extra strength is what id do) or delsym. Make sure it ONLY contains dextromethorphan. Some of em contain shit thats bad for your liver and that can be bad for your liver if taken in high doses.
Id start off low if i were you and work your way up. Start around 350 mg to 400 and take 900 as the highest dose when you feel comfortable.
You may throw up. Only do it once every two weeks at least or once every month. Try and take a pill that likely prevents you from throwing up because ive thrown up my whole high before. The more often you do it, the less high you get.
Epect to walk like your drunk and cant even stand. Expect to feel like your spinning around, floating up, floating down (with your eyes closed). Expect to enter worlds with your eyes closed. I heard you can see stuff with your eyes open too but i always had my eyes closed because it made me look like i was sleeping and no one would bother me and i saw more shit. However, onetime i was having my eyes open and i saw a midget trying to fix our light bulb. He was on our table



and he sounded funny af.
Expect to forget a lot of shit real easily. Oh yeah and drink something with the dxm itll help you not throw up. I wouldnt mix it together id just take a gulp of dxm then drink then dxm then drink.
Never once had a bad experience while high off that shit. But the withdrawals are terrible as fuck. I saw and heard shit while withdrawling. I couldnt sleep much for a few weeks. I was so cold at night. I had bad memory and couldnt focus. Doing dxm too much can fuck with your brain. Be careful. Again, try not to do it too much like i did. Maybe if you dont do it too much you wont go through a withdrawal.
Oh yeah i believe smoking cigarettes while high off dxm can make you likely to throw up but if you dont throw up it feels great.
Ask questions and do your research before you try it. And if you like bad trips try benadryl

makes you see spiders and demonic stuff. But it makes you really thirsty too.
Heres how to make the dxm powder so you can snort it or make it into food i found it on bluelight
https://bluelight.org/xf/threads/dxm-extraction-from-delsym.720456/unread