Guaifenesin-D3 is intended for use as an internal standard for the quantification of guaifenesin by GC- or LC-MS. Guaifenesin (
T0739) is an expectorant. It inhibits production of mucin 5AC (MUC5AC),reduces mucus viscosity and elasticity,and increases the mucociliary transport rate of endogenous particles in primary human tracheobronchial epithelial cells in a concentration-dependent manner. Guaifenesin (
T0739)increases phenol red secretion,a marker of expectorant activity,in rats.3 Formulations containing guaifenesin have been used as expectorants in the treatment of the common cold and chronic bronchitis.