The good thing about interferon therapy for hepatitis B is that it can regulate the immune function of the body, can inhibit viral replication, can improve the body’s immunity, and there are also inhibitions of the growth of malignant tumors and other effects; the bad thing is that some people will have fever, headache, myalgia, and other influenza-like symptoms, and may even have bone marrow suppression, mental abnormalities and other symptoms after using interferon. 1. Benefits: Interferon has antiviral effects, immunomodulatory effects, and antitumor effects. Clinically, it can be used in the treatment of various viral infections such as chickenpox, slow hepatitis B, slow hepatitis C, rabies, and the adjuvant treatment of certain malignant tumors such as liver cancer, breast cancer, lymphoma and certain leukemias. 2. Bad effects: the use of interferon may have the following side effects, such as influenza-like syndrome, myelosuppression, mental abnormalities, autoimmune disease, other rare adverse reactions: retinopathy, interstitial pneumonitis, hearing loss, renal damage, cardiovascular complications, and so on. Application of interferon therapy must be used under the guidance of a specialized doctor.