both Carbocisteine and guaifensin are mucolytics, meaning they break down the bonds holding mucous together. i think Carbocisteine probably is a better choice. guaifenesin was just better known and over the counter.
i read a few things that say guaifenesin may not be actually mucolytic, but somehow reduces surface tension and adhesiveness of the mucous.
Thanks both of you. I look forward to reading how you get on, Hufty.
If both drugs work on different principles (I like the sound of the surface tension principle, but then again, I like physics, so I probably would...), why not take both at the same time? Hedge your bets?