prevent cold and flu, however, is also for some people. If you have a cough, it's an inflammation of the throat, and it's also caused by fire. So, it's better to take some herbal medicine, like herbal medicine Duffy ah! It is our family also always have Xingqun Xia Sang Ju, a little expensive. But I feel it is more effective. And you can go to herbal tea store to drink echium, but it's quite bitter! It's better to treat it earlier and relax earlier!