what is guaifenesin ac
Guaifenesin is an expectorant that helps thin and loosen mucus in the lungs, making it easier to cough up the mucus. Codeine is a narcotic cough suppressant (antitussive) that affects a certain part of the brain, reducing the urge to cough.ow to use Guaifenesin AC. Take this medication by mouth with or without food, usually every 4 to 6 hours as needed with a full glass of water (8 ounces or 240 milliliters) or as directed by your doctor.