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Expectorants are medications that break apart mucus and make it easier to cough up and expel from your body. There are many over-the-counter expectorants available at drug stores, but you can go to your doctor for a prescription as well.
Expectorants help thin the mucus and make it easier to cough mucus up when you have a productive cough. Use an expectorant if you have a cough that produces thick mucus and you are having trouble coughing the mucus up. Don't depend entirely on an expectorant to thin the mucus. Drink plenty of water also.