The side effects of fishy grass are: 1, fishy grass has little toxicity, and after oral administration there is a fishy odor, which may affect appetite, resulting in poor appetite affecting meals; 2, local pain can occur when injected intramuscularly, some patients are more sensitive, there will be more obvious local muscle swelling and pain after intramuscular injection; 3, there is a certain degree of irritation to the vaginal mucosa, avoid contact with the vagina during the use; 4, the most serious Ichthyophonous injection can cause allergic reactions, manifested by drug dermatitis, red rash on the skin after using the injection, which can generally subside on its own after stopping the drug. There are also peripheral neuritis, anaphylactic purpura, etc. Serious cases can cause anaphylaxis and even death, which should be given sufficient attention and is now clinically banned.