Guaifenesin is an expectorant available in over-the-counter (OTC) medicines that make coughs more productive by loosening chest congestion and ridding the airways of bothersome mucus. Guaifenesin can be the only active ingredient in a cough medicine, or it can be found in multi-symptom cough and cold products. Guaifenesin may also be found in medicines that treat bronchial asthma.
Guaifenesin is approved by the U.S. Food and Drug Administration (FDA) and is safe and effective when used according to the Drug Facts label directions. Parents and other caregivers should be aware that OTC cough medicines and multi-symptom cough and cold products are not intended for use in children under the age of 4.