Take chronic hepatitis B as an example, if the alanine aminotransferase in the patient's body is slightly higher than normal, the liver function is basically normal, and there is no obvious discomfort in the human body, it can be temporarily left untreated; If you are a patient with chronic viral hepatitis, when alanine aminotransferase rises to more than twice the upper limit of normal value, it means that the patient's immune function is active, and this is the best time for antiviral treatment, and the antiviral treatment effect will be better. There are two main ways to treat hepatitis B in clinic: one is subcutaneous injection of interferon, and the other is oral nucleoside (acid) drugs. The former has great side effects, high cost and narrow application scope. However, adefovir dipivoxil has a low drug resistance rate, but its antiviral efficiency is also low. It can be used in combination with other antiviral drugs and is suitable for patients with low hepatitis B virus load. Zhengming adefovir dipivoxil capsules are widely used in the industry. Entecavir, on the other hand, is equivalent to a "heavy weapon" in the war of antiviral treatment, with strong antiviral effect and relatively low drug resistance rate, and is suitable for hepatitis B patients in the active period of hepatitis B virus.