Guaifenesin

Guaifenesin is a pharmacological agent classified as an expectorant, primarily used for the symptomatic relief of cough and respiratory congestion (StatPearls). It is important to note that Guaifenesin is a small molecule drug and not a biological target, such as a receptor or enzyme, which makes its classification as a target technically incorrect (DrugBank). The drug functions by increasing the volume and decreasing the viscosity of respiratory tract secretions, facilitating their clearance via ciliary action and the cough reflex (NIH). While the precise molecular mechanism is not entirely understood, it is hypothesized to involve the stimulation of vagal receptors in the gastric mucosa or potential weak antagonism of N-methyl-D-aspartate (NMDA) receptors (PubMed). Due to its role as a therapeutic agent rather than a target, it does not possess standard molecular classifications like G protein-coupled receptors or ion channels. Its primary clinical application is in the management of productive coughs associated with the common cold and various respiratory infections.

Other names

Glyceryl guaiacolateGuaiacol glyceryl ether3-(2-methoxyphenoxy)propane-1,2-diolGuaiphenesin

Guaifenesin acts as an expectorant by increasing the volume and reducing the viscosity of secretions in the trachea and bronchi (StatPearls). It is thought to reduce the adhesiveness and surface tension of mucus, facilitating its removal by the cilia (NIH). It may also stimulate gastric vagal receptors, which reflexively increases respiratory tract fluid secretion (PubMed).