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.
Pseudoephedrine is in a class of medications called nasal decongestants, which cause smooth muscles around the airway and nasal cavity to relax, allowing more air to flow through. It also causes blood vessels to contract.t's used to temporarily relieve nasal congestion from colds, allergies, and hay fever, and temporarily relieve sinus congestion and pressure. Though it can relieve symptoms, pseudoephedrine doesn't treat or speed the recovery of the underlying health condition.