just wanted to ask,have read abt magic meds being a cough bottle that contains guaifenesin,does guaifenesin have to be the only ingredient? if so can anyone recommend any certain types of cough bottles that are suitable? just that i got a bottle of benelin for my dh the other day and noticed that it had guaifenesin 100mg and levomenthol 1.1mg,and was wondering if it would be the right kind to take or not?????