You cannot cure a dry cold cough with over the counter medicine well because they do not have opiates in them. The DXM is part of morphine but it lacks the components to silence a painful dry cough, it dose make it not as bad. But in a bad case of a cold cough sometimes its best to go to the doctor and get some prescription cough medicine if its keeping you from resting. The less rest you get the longer it will take the body to fight off the virus.
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