Robitussin?

Would 405 mg be too much for a first timer?

no that would be good

^^Yes it would be fine, i used to take 600+ every time i did DXM. now i keep it to a 300-600mg dose, just don't get addicted to high doses, i remember many memories of me laying on the floor watching my bathroom spin then puking, and after seeing everything vibrate. It's not fun (well until you start tripping) one time when i finally kept down a 810mg dose of dxm, i had the most intense out of body experiences i've ever perceived. Id be standing wherever i was looking at, it was messed up.

yea, dont count on getting much sleep. and you get a major hangover from it as well which is wierd because i never really get severe hangovers. but i wouldnt watch a movie, i tried but i couldnt follow it very well. The best is just lying down in keeping the room kind of dark. you trip more if you have fewer distractions. and ive heard its better to use the liquid kind because the stuff that coats the gells is bad for your liver. I just mixed it with a coke and it tasted kind of good, like cherry cola.

read the dxm f.a.q first- http://www.erowid.org/chemicals/dxm/faq/dxm_faq.shtml

its always smart to know the most about what your putting in your body