In pediatric clinics, parents of children often ask me, “My child is always sick, is there any medication that can improve the immune system of my child? Because many parents and friends have certain misunderstandings on this issue, I am here to thoroughly explain this issue to you for your friends’ reference. There are many drugs to improve immunity, but from a certain point of view, there are only two kinds, one is active to improve immunity, and one is passive to improve immunity. Both types of drugs have their advantages and disadvantages and have different clinical indications. The passive immunity-boosting drugs are represented by gammaglobulin and thymidine, which can improve the humoral immune function, and thymidine can improve the cellular immune function. It is characterized by quick effect and more certain effect, and it is directly replenishing the antibodies and immune substances that the body needs. But there are also certain disadvantages, such as gammaglobulin, which has three disadvantages: First: the maintenance time is not long, because the half-life of gammaglobulin (when the effectiveness is reduced to only half) is only 16 to 24 days, so the preventive effect after one injection usually only lasts for about 1 month; Second: it is usually a blood product, which has certain dangers; Third: the use of these drugs may “crutches”, that is to say, always enter such drugs, it will make the body dependent to a certain extent, and produce these substances themselves will be reduced. If they are not infused anymore, the resistance may be a little lower. This type of drug is usually used once or twice during the time when the child has a serious illness. Active immunity-boosting drugs, represented by Pitocin and Yupin, there are many other drugs in this category, such as transfer factor, interferon, levamisole, etc. These drugs can stimulate the body to produce immune substances. Pidomod is more accurate, but more expensive; Tongkang tablets, moderately priced and effective, and the role of improving appetite, it is a drug based on the reduction of Yu Pingfeng, colorful isotype chewable tablets, taste and color are very suitable for children to take.