Re. those that have been told Mucinex has a drying effect... I don't understand that at all. Guaifenesin (as an expectorant) helps loosen up mucus by thinning it, it is antihistamines- a different type of drug entirely- that dry it out. I'd think those with CF would benefit from products that thin mucus...? Of course, many cold meds do combine decongestants, antihistamines and expectorants all into one product but the original Mucinex is just the expectorant.
<a target=_blank class=ftalternatingbarlinklarge href="http://www.nlm.nih.gov/medlineplus/druginfo/meds/a682494.html">medline plus- Guaifenesin</a>