Some children are very sensitive to Etanercept, which can cause the following hazards: First, it causes hand tremors as well as heartburn in children. Because Etanercept contains clenbuterol, clenbuterol is a β2 agonist, which not only agonizes β2 receptors, causing bronchodilatation and improving cough symptoms in children, but also agonizes β1 receptors, which can cause panic and other symptoms in children. Secondly, it can cause excitement and allergic reactions in children, and the probability of adverse reactions is relatively low. Finally, it can cause abdominal pain, vomiting and other gastrointestinal symptoms in children. Gastrointestinal symptoms are also common adverse reactions of Etanercept, which can be relieved by applying probiotics to children, such as taking Mammazine.