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.
1 Review. Pseudoephedrine is a drug found in numerous prescription and behind-the-counter medications, including Sudafed Congestion (but not Sudafed PE), Zyrtec-D, and Claritin-D.It'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.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.