DEXTROMETHORPHAN;
GUAIFENESIN treats the symptoms of the common
cold,
allergies, or
flu. It works by reducing
cough and loosening mucus. It is a combination of a cough suppressant and an
expectorant. Get Guaifenesin ER for as low as $3.71, which is 81% off the average retail price of $19.03 for the most common version, by using a GoodRx coupon.