Lefunan is mainly used for the treatment of chronic viral hepatitis B. Lefunan is an innovative new biological drug with independent intellectual property rights in China, and its therapeutic effect on chronic viral hepatitis B is better than that of lamivudine, entecavir and adefovir. The price of a single dose is between 200-300 yuan, and the cost of a course of treatment is about 30,000 yuan, which usually requires injection therapy. For patients with chronic viral hepatitis B, the traditional method is to take oral antiviral drugs or injections of interferon, which is not effective in the treatment of the virus and has certain side effects. However, Lefunan is a biological agent, which is more effective than other drugs in the treatment of chronic viral hepatitis B. In addition, Lefunan is effective in the treatment of oncologic diseases. In addition, Lefunan has great potential for the immunotherapy of tumor diseases and autoimmune diseases. In addition to the therapeutic effect according to incomplete statistics, its cure rate is also relatively high. During the treatment of chronic viral hepatitis B, patients should pay attention to more rest, do not stay up late, do not labor.