Hello: ephedra into the soup is to be first decocted, the herbal preparation recorded "in the Mou production of ephedra, winter months do not snow", which indicates that the ephedra can quickly the human body's yang qi from the kidney to the surface of the body in order to resist the cold evil, but after the roasted sweating power is not so strong, and is only used for the lungs to promote the qi. Fine Xin this medicine is toxic, because it contains safrole, a carcinogen, but it is easy to volatilize, as long as the decoction process has been open the lid of the pot, boiled for half an hour on the toxicity is greatly reduced, so that the sizzling of ephedra is not necessary after the next, raw ephedra need to be boiled first, which is in the typhoid fever also recorded, and fine Xin is not necessary to decoction after the opposite in the relief of the table should also be decocted first for a while.