I bought a bottle of this stuff called "double action ephedrine" because i was planning on using it with no doz as a cheap alternative to "stacker3", the tablets in my double action ephedrine has 25 mg of ephedrine and 200mg of this stuff called guaifenesin. does anybody know what "Guaifenesin" is and will i have to take caffeine or does this stuff have the same effect? please help