I bought a bottle of children's cold & cough medicine (liquid, off brand) that has Dextromethorphan, antihistamine, and a nasal decongestant. The bottle is 8 fl oz. I've never tried DXM before but have wanted to. I was thinking about just shotgunning the bottle but thought I'd post first. Any suggestions? Anyone ever used this before to get high? Also I'd like to note that I have a massive tolerance to painkillers, if that matters at all. Only other drug I use except pot. Thanks in advance for the help it is greatly appreciated.