Codeine (codeine phosphate) contains the active ingredient codeine and is used to reduce pain from headache, the flu and common cold. See here for more information and to order.
A: Mucinex contains the active ingredient guaifenesin, which is an expectorant that helps loosen phlegm and thin bronchial secretions. Mucinex does not have rapid heart rate as a possible side effect. There is a product called Mucinex-D that contains pseudoephedrine, and this ingredient can increase heart rate.
Mucinex (guaifenesin) is an expectorant. It helps loosen congestion in your chest and throat, making it easier to cough out through your mouth. Mucinex is used to reduce chest congestion caused by the common cold, infections, or allergies. Mucinex may also be used for purposes not listed in this medication guide.