Expectorants operate mainly by increasing the hydration of mucus, making it thinner and less viscous. This action helps in loosening and clearing mucus from the respiratory tract, which can be particularly beneficial during a cough. As the mucus becomes easier to expel, patients often find relief from chest tightness and difficulty in breathing. One popular expectorant is guaifenesin, which is found in many over-the-counter cough syrups and cold medications.
