Guaifenesin can be found in small doses in cough syrups and other similar formulas, even over-the-counter forms. Guaifenesin is an expectorant. It works to loosen and thin mucus in the air passage. This makes it easier to cough up mucus and clear airways, allowing breathe to come easier. It relieves coughs and congestion of colds, bronchities, and other lung infections.
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