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 DM is unique because it also contains a drug called dextromethorphan, which controls coughing by creating a message to the part of your brain that controls your cough reflex. Both Mucinex and Mucinex DM come in maximum strength versions as well. The side effects of both are similar to one another and can include diarrhea, dizziness, headache, drowsiness and stomach pain. Some of the other drugs that shouldnât be used with Mucinex DM include many drugs used to treat psychiatric disorders including depression, and Parkinsonâs disease medications.