Also known as Mucinex
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.
Source: WikipediaEstimated Total Cost: $12.94 for an average of 14 days supply
Patients are most commonly prescribed guaifenesin to treat cough, common cold, nasal congestion, and chronic obstructive pulmonary disease (copd).