Drug side effects are the most common adverse drug reactions, which refer to the effects of drugs at therapeutic doses that have nothing to do with therapeutic purposes. Can bring discomfort or pain to patients, generally mild, mostly recoverable functional changes, and disappear immediately after stopping taking drugs. The pharmacological basis of side effects is the low selectivity and wide range of action of drugs. When a certain effect of a drug is used for therapeutic purposes, other effects become side effects, which shows that side effects are inherent effects of drugs. When a drug is used to treat a disease, it is necessary to use a therapeutic dose, so that side effects will follow, which is inevitable. Jiurun Fengdou fine brand Dendrobium candidum granules are mainly composed of Dendrobium candidum and American ginseng, and the auxiliary material is glucose, which has no great side effects. However, sodium benzoate is a preservative used for oral liquid drugs, which can prevent deterioration and sourness and prolong the shelf life. Excessive use will do harm to the human liver.