If it's hard to get the mucus out, or if it’s thick, look for medicine that says “expectorant.” That loosens the gunk to help you get rid of it. If you're having post-nasal drip with lots of juicy mucous, you may do better with a medicine that dries you up like Sudafed (pseudoephedrine). If you have cough with fever or shortness of breath call your doctor. Also check with them before you use cough medicine for serious conditions like emphysema, pneumonia, chronic bronchitis, or asthma. And don’t give cough and cold medicine to children under 4.