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 Missed Dose. If your doctor has instructed you to take Mucinex regularly, take a missed dose as soon as you remember. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule.Do not double up on doses to make up for a missed dose.ucinex is the brand name of an expectorant drug called guaifenesin. It helps reduce chest congestions caused by colds, infections, or allergies. Mucinex works by thinning the mucus in the air passages. While Mucinex can help control symptoms, it doesn't treat the cause of congestion.