What is "guaifenesin"

alt. glyceryl guaiacolate, an expectorant drug used to assist the expectoration of phlegm from the airways in acute respiratory tract infections. n. glyceryl guaiacolate, an expectorant drug used to assist the expectoration of phlegm from the airways in acute respiratory tract infections.

Guaifenesin INN or guaiphenesin (former BAN), also glyceryl guaiacolate, is an expectorant drug sold over the counter and usually taken orally to assist the bringing up ( expectoration) of phlegm from the airways in acute respiratory tract infections.