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 contains guaifenesin, which acts as an expectorant and relieves chest congestion and helps with phlegm. Mucinex is also available in other combinannation such as Mucinex DM, which also contains dextromethorphan (a cough suppressant), and Mucinex D, which contains a decongestant,