How many years can you live on entecavir depends on the patient’s individual situation, and specific problems should be analyzed, not generalized. Entecavir is used in the antiviral treatment of hepatitis B. Chronic hepatitis B patients who take entecavir in time for antiviral treatment can control the progress of the disease and will not affect the patient’s life; if hepatitis B has progressed into cirrhosis, especially decompensated cirrhosis, the patient’s survival period may only be 5-10 years. Taking entecavir can stop further deterioration of the disease and prolong the patient’s life. However, taking entecavir may cause adverse reactions such as drowsiness, headache, fatigue, dizziness, nausea, etc. It may affect renal function, calcium and phosphorus metabolism, and viral rebound may occur after stopping the drug, which may cause liver failure in severe cases. Hepatitis B patients taking entecavir treatment, should adhere to the regular use of medication, do not stop without authorization, while avoiding overwork, avoid spicy stimulating food and drugs that damage the liver.