Amy tenofovir can be put back on if you forget to take it just once or twice. If you have not taken it for more than a week, you need to go to the hospital for examination and treatment. Amitinofovir is an antiviral drug for hepatitis B. It needs to be taken regularly in order to achieve stable blood levels and antiviral effect. Not taking it for a long time may lead to virus rebound and drug resistance, so you need to take it regularly. If you miss one or two doses of Emtinofovir, you can take it again, and it will not affect you too much. If the missed dose is too long, more than one week, you need to go to the hospital for further examination to see if you need to switch to another antiviral regimen. Generally, liver function, hepatitis B DNA, abdominal ultrasound, hepatitis B 5 and other tests need to be completed to clarify the situation of viral rebound. If the condition is stable, you can continue to take Emtinofovir, and the virus rebound may require changing the antiviral regimen.