1. a medication that helps thin and loosen mucus to make coughs more productive, commonly used in over-the-counter cough and cold remedies
Usage: also spelled guaiphenesin; pharmaceutical/medical context

Examples

• The cough syrup contains guaifenesin to help clear congestion.
• Guaifenesin is an active ingredient in many over-the-counter cold medicines.
• The doctor recommended a guaifenesin-based expectorant for the patient's persistent cough.
• This cough medicine works because guaifenesin thins the mucus in your airways.
• Guaifenesin is often combined with other ingredients in multi-symptom cold remedies.