i've tripped on dxm like 4 times or so, some with different amounts of Robitussin DM:

first time: 8oz. the most fun i've ever had playin mini golf with a bunch of friends at the beach then just messin around on the boardwalk
second time: 8oz. again the best time i ever had with a friend jst bein fuckin retards
3rd: 4 oz. less intense but still a very powerful trip
4th:6oz: me and my brother split a 8 and a 4 oz bottle (6oz. per person for those mathematically challenged, .. it's ok). my bro puked and i couldnt handle it. (it's such a buzzkill to see someone pukin) and i puked. not fun but my buzz was still goin, it just didnt last nearly as long as it wouldve been if i didnt puke.

Iver learned that being 5' 7" and 150 is perfect for drinkin around six ounces, give or take 1 or 2. personally i found that video games kill ur DXM high, but thats jst me. try to just chill with a friend or two which is a lot funner when they drink the same amount at the same time; most the times you can bet ur life on ur friend is feelin the exact trip u are. i thik its a slightly more physical high, try to be movin around and doin stupid shit. i like watchin a movie after drinkin a bottle bc by the time the movie is over you are just startin to trip out.

thats what i kno, jst 2 rules for my DXM use: never more than 8 oz: about 700mg, Never use more than once a month: just a health precaution. Im plannin on doin it 2nite for new years. drink an 8 oz around 7 , smoke a bowl, have a few drinks, chill wt sm friends, and let the trip keep me up till prolly around 1am.

hope this helps all u guys questioning with the robitussin chugging thing but its definetly worth a try before you critisize people for finding a kickass, mostly safe, LEGAL high.

peace