The first decoction is made in half a pot of water for 30 minutes on high heat and low heat, while the herbs are soaked in half a pot of cool water. 2. After the first decoction is ready, put the soaked herbs with water into the pot where the first decoction is being cooked, and decoct it for 30 minutes on high heat and low heat, then pour out the juice, which is the first decoction. 3. Add the dregs of the medicine with cool water, and let the water cover the surface of the medicine by one inch, fry on high heat and low heat for 30 minutes, and pour out the juice of the medicine. 4 mix the two decoctions into two portions of not less than 200 ml each, drink half an hour after breakfast and dinner. Boil the first decoction of common cold medicine for 15 minutes and the second decoction for 30 minutes. Other common tonics are boiled for half an hour for the first decoction and 30 minutes for the second decoction.