Guaifenesin, also known as glyceryl guaiacolate, sold under the brand name Mucinex, among others, is an expectorant medication taken by mouth and marketed as an aid to eliminate sputum from the respiratory tract. From Wikipedia
CVS voluntarily decides to remove select over-the-counter cold and allergy medications containing phenylephrine as the sole active ingredient, although FDA's final ruling on its efficacy is still pending. Major rival pharmacies like Walgreens and Walmart are yet to follow suit.
