OTC
Expectorant (cough medicine that loosens phlegm)
Guaifenesin
Last reviewed April 2026
Who is this for?
What is this drug?
Guaifenesin is a cough medicine that works by thinning and loosening mucus (phlegm/catarrh) in your airways, making it easier to cough it out.
What is it used for?
Wet cough with phlegmchest congestioncatarrh that sits on the chest
Available Over The Counter
Available at pharmacies without a prescription. Rules may vary by country.