Entecavir capsule is mainly used as an antiviral drug, which can be applied to the treatment of chronic adult human hepatitis B with persistent elevation of serum aminotransferases during the period of active viral replication, or with active lesions shown by liver histology. Entecavir can be used mainly for the treatment of hepatitis B. This drug mainly has an antiviral effect and has a certain inhibitory effect on the reverse transcriptase of hepatitis B virus. Through the inhibition of the enzyme, the replication of the hepatitis B virus and other processes are inhibited. Based on the antiviral effect, Entecavir capsule can be mainly used for the treatment of chronic hepatitis B in clinic. Apart from this, it can also be used for some other viral infectious diseases. This drug should be used in accordance with the doctor’s advice, according to the recommended usage and dosage, and should be checked before and after the use of the drug, such as liver and kidney function, as well as blood and other related biochemical and blood indicators.