Guaifenesin is an expectorant. It is used to treat minor upper respiratory infections and similar conditions such as bronchitis, colds and sinus or throat infections. In theory guaifenesin is supposed to thin the mucus and phlegm making it easier for the patient to cough up and breathe freely. In reality there is little evidence of its efficacy as an expectorant or as a cough suppresant.
Guaifenesin works in theory by increasing the production of fluids in the respiratory tract. This helps to liquify and thin the mucusThe viscous secretions of the mucus membranes and glands. Mucus contains mucin, white blood cells, water, salts and exfoliated cells.
Visit our comprehensive glossary for more pregnancy terms and definitions., although there is little scientific evidence to confirm this.
Common brand names
Common side effects
Studies suggest that guaifenesin may be used safely throughout pregnancy, although you may want to consult your doctor before taking medication containing guaifenesin while pregnant.
Guaifenesin may pass into breastmilk. Although problems have not been documented you should consider avoiding the use of guaifenesin while breastfeeding. Consult your doctor for specific information.
Guaifenesin should not be given to children under the age of two without specific recommendation from a pediatrician. Children under the age of twelve should consult a physician before taking guaifenesin.
There are no known food interactions.
There are no special warnings regarding the consumption of alcohol while using guaifenesin.
Guaifenesin is the most common expectorant used in proprietary medications and can be found in many cold preparations. Consult with a pharmacist before purchasing a product if you are unsure whether it contains guaifenesin. You should not use guaifenesin to treat a persistent cough for more than one week without getting medical advice.
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