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.
âº Doesn't work as well if you use it for more than 4 days at a time. âº Although you don't need a prescription to get Mucinex D (Guaifenesin / Pseudoephedrine), you need to show a photo ID to buy it in the drugstore. âº Mucinex D (Guaifenesin / Pseudoephedrine) isnât useful if you have a dry cough.