The side effects of C. elegans rhinitis medicine are generally few, and may be summarized as follows: First, C. elegans rhinitis medicine may produce toxic reactions if taken in large doses for a long time, and the longer the medicine is used, the greater the amount of toxic reactions, the more serious it can be, and the general swelling, urination, liver function and kidney function damage, especially kidney function damage is more obvious. Secondly, allergic reactions, after the application of the Cangzhi rhinitis drug appeared all over the skin itching, erythema, and pharyngeal itching, cough, laryngeal edema and other related performance. The third is that the application of Cangrei nasal medicine on an empty stomach may lead to stomach discomfort, gastric distension, stomach acidity, hiccups, etc. In severe cases, it may induce gastric ulcers and gastric bleeding, but it is rare, and some patients are also prone to bloating and diarrhea after application.