what is guaifenesin used for

Guaifenesin is an expectorant used to help clear mucus or phlegm from the chest when you have congestion from a cold or flu. It works by thinning and loosening mucus in the airways, clearing congestion, and making breathing easier. Guaifenesin is available in different forms such as tablets, capsules, dissolving granules, and syrup (liquid) to take by mouth. It is usually taken every 4 hours as needed, with or without food. Guaifenesin is not expected to cause different side effects or problems in children than it does in adults, but it should not be given to children and infants younger than 2 years of age unless directed to do so by a doctor. Guaifenesin is commonly found as part of over-the-counter combination medications for cold and cough, and it is important to read labels or ask a doctor or pharmacist before using any other cold or cough medicine when taking guaifenesin.