Cough is the single most common reason that patients in the U.S. go to their doctor. Since it's a problem that's so huge, we certainly felt that well-written, state-of-the-art guidelines were necessary to help physicians all over the country deal with this common and often very difficult problem.

We're just saying that those studies don't exist that these products work.

It's no mystery to doctors that the over-the-counter preparations may not do much for the cough but the guidelines are stating the fact that there are very few well-done scientific studies to support their use. That's not to say that some of these products may not be helpful for some people to some degree, but those studies just aren't out there.