. . . . . . . Decoction is the earliest and most widely used dosage form in clinical medicine. The decoction method has a history of more than 2000 years. The purpose of decoction is to transfer the active ingredients in the medicine into the soup through physical and chemical effects (such as dissolution, diffusion, penetration and desorption, etc.). For a bag of Chinese medicine, you can’t simply add some water to simmer for a while. Even if you are done, you need to pay attention to some principles, methods and conditions. Generally speaking, you need to pay attention to the following issues:  . . . . . . ◆Appliance: The quality of Chinese medicine decoction has a close relationship with the selected decoction. It is still better to use a casserole, because the material of the casserole is stable, it will not chemically react with the pharmaceutical ingredients, and the heat transfer is even and gentle, which is one of the reasons it has been used since ancient times. In addition, enamel pots, stainless steel pots and glass containers are also available. However, iron pots or copper pots cannot be used, mainly because the chemical properties of iron pots or copper pots are unstable, and may react with the chemical components contained in traditional Chinese medicines when decoction medicines, such as tannins can be generated with tannins. Iron, and flavonoids can form insoluble polymers, and organic acids can form salts. These will affect the quality of the decoction, and directly related to the clinical efficacy of the traditional Chinese medicine decoction. &Nbsp. . . . . . ◆Water: Most of the medicine is now boiled with tap water, well water and spring water, as long as the water quality is clean. As long as the tap water meets the drinking standard set by the state, if the problem of residual chlorine is considered, the tap water can be placed in the container for several hours and then used for decoction, which can significantly reduce the content of chlorine. &Nbsp. . . . . . ◆Temperature: Temperature is an important factor that makes Chinese herbal medicine effective when decoction. When decoction is generally a small fire (slow fire) is appropriate. Because it is burnt with a fire at the beginning, it can often cause the protein contained in the botanical Chinese herbal medicine to solidify quickly and affect the effective composition. Therefore, it is best to soak the Chinese herbal medicine in cold water for 15 minutes before decoction. In this way, the cells of the plant traditional Chinese medicine will be swollen after soaking, and then decoction with a small fire can cause the protein to slowly precipitate out. If it is destroyed, the water will not be dried quickly. &Nbsp. . . . . . ◆Time: The length is different due to different drug properties, generally about 30 minutes. However, it takes only 20 minutes for diaphoretic and volatile medicines (about 5 minutes after boiling in water); it takes longer for strong tonic medicines. Many people are used to determining the length of decoction based on the depth of color. It is wrong to think that the color of the soup is fried to the deepest. Because the color of some Chinese herbal medicines can be fried deeper and deeper, but in fact the active ingredients of the medicine have already been fried. Some medicines decoction take too long, which will cause the escape of certain volatile substances and the destruction of effective ingredients. &Nbsp. . . . . . ◆Number of times: Chinese herbal medicine decoction, each dose usually needs to be fried twice (the first liquid is called “head juice”, the second time is called “second juice”). The amount of water added to the first juice is appropriate to cover the medicine surface, which is about 2 to 3 times the volume of the medicine; the amount of water added to the second juice can be reduced appropriately. For some medicines that are difficult to decoct the effective ingredients, such as mineral medicine and shellfish, it needs to be decoctioned 3 times. In addition, some drugs such as mineral amethyst, cold water stone, etc., because the solubility in water is very small, it is generally necessary to fry for a while before adding other medicines to fry, and some must be broken before frying. Other medicines, such as diaphoretic medicines (mint, catmint, etc.) or aromatic stomach medicines (such as wood incense, cloves, etc.), because they contain volatile active ingredients, should not be decoctioned for a long time. Then add (called “later down”) the same fried. Some valuable medicines such as rhino horns and antelope horns need to be crushed, and powders such as Panax notoginseng and Baiyao must also be taken. &Nbsp. . . The above list is just the precautions under normal circumstances. Usually, you should ask the doctor after seeing a doctor to get the medicine. Do you have your own medicine?