DXM and Wieght??

I am gonna buy some rubitussin <SP? gel caps one bottle =300mg correct! I wieigh 140 and plan on dosing between 300-450 mg 1 1/2 bottles would this be enough to reach the third plateu as describe in erowid? I have never done this before1
also my friend never has either he is 230 lbs or so how much should he take i was thinking 450-600!
I want us both to reach the third plateu buy not nothing like an OBE!

i would stick closer to the 300-350 mark for ur first time and c how that goes. as for ur friend i suggest the same.