Key takeaways
Capmist DM (dextromethorphan/guaifenesin/pseudoephedrine) and Mucinex DM (guaifenesin/dextromethorphan) are both used to relieve cough and chest congestion, but they belong to different medication classes. Capmist DM combines a cough suppressant, expectorant, and decongestant, while Mucinex DM includes only a cough suppressant and expectorant. Capmist DM is available as a tablet and is behind-the-counter in many states, whereas Mucinex DM is available over-the-counter in various forms, including tablets, liquids, and granules. Capmist DM is typically taken every 4 hours, while Mucinex DM is taken every 4 to 12 hours, depending on the form. Capmist DM may cause side effects like dizziness and restlessness and can interact with medications like monoamine oxidase inhibitors (MAOIs), increasing the risk of serotonin syndrome. Mucinex DM can sometimes cause dizziness and drowsiness, and it should not be taken with other medications containing similar ingredients to avoid overdose. Talk to your prescriber or pharmacist before taking either medication if you have other health conditions or take other medications.
