1. an expectorant drug used to help clear mucus from the respiratory tract, commonly found in cough medicines
Usage: pharmaceutical/medical term; often used in over-the-counter cough and cold remedies

Examples

• The cough syrup contains guaifenesin to help loosen phlegm.
• Guaifenesin is commonly recommended for treating wet coughs.
• Many over-the-counter cold medicines include guaifenesin as an active ingredient.
• The doctor suggested a guaifenesin-based expectorant to help clear the congestion.
• Guaifenesin works by thinning mucus so it can be coughed up more easily.