Ryukakusan is a drug produced in Japan, which is an over-the-counter drug and can be bought in general pharmacies. Dragon's blood contains keel, borneol, antler cream and other substances, which has the effects of convergence, resuscitation, hemostasis and swelling reduction. It is generally used to treat colds, coughs, shortness of breath and other diseases, and also has the function of moistening the throat.