If you have a chance buy yourself a bottle of robotussin max strengh. That is the kind that has only DXM in it. If you are also wanting to make it worth it and actually trip out you will need more than a 4 oz bottle. I am a 150 lb male and I took 1 3/4 to 2 4 oz bottles and got pretty good. Also if you prefer they have new robo max strengh pills out now. They are much better cause you dont have to suffer through the horrible taste of the syrup. Here is a site with a ton of info on it about DXM and I would strongly recommend reading before doing cause it is always smart to know what you are doing before you do it. Have fun.

http://www.third-plateau.org/faq/dxm....shtml#toc.5.1

That is where you can find out good info on dosing, but read a lot of the other stuff on that site too.