Thymofaxine for injection, whose main ingredient is thymofaxine, is a drug with antiviral and immunomodulatory effects that can enhance immune cells by stimulating immune cells in the peripheral blood. It can also increase the secretion of cytokines such as interferon and interleukin by immune cells, which are very important for the regulation of human immune function. In addition, it can also have an antiviral effect in the treatment of chronic hepatitis B. The mechanism of antiviral is not yet very clear. In clinical practice, thymofaxine for injection can be used mainly for the adjuvant treatment of chronic hepatitis B. It can also be used as a vaccine immune response booster for immune compromised patients. In immunosuppressed patients, including those on chronic hemodialysis and elderly patients, thymofaxine may enhance the immune response to viral vaccines such as influenza vaccine or hepatitis B vaccine. In conclusion, thymofaxine for injection is an adjuvant treatment for hepatitis B and immunomodulatory.