By the way, it's commonly known as Robitussin -- or any of those generic knockoffs, Tussin, Super-Tussin, etc. Buy the one without the other powerful active ingredients like pseudoepinephrine (PE), DM, CF. Those things are another story.
This is totally new to me--I know about guiafenisin and I know about aspirin--are you saying they aren't to be taken together?
In other words, could you explain a little further?