Entavir 1mg Tablet contains Entecavir, a potent antiviral agent indicated for the treatment of chronic hepatitis B virus (HBV) infection in adults with evidence of active viral replication and either persistent elevations in serum aminotransferases or histologically active disease. Entecavir is a nucleoside analogue that inhibits HBV replication by interfering with the viral polymerase enzyme, thereby reducing viral load and improving liver function. This medication is particularly effective in patients with compensated liver disease and has demonstrated a favorable safety profile in clinical trials. Entavir 1mg Tablet is administered orally, typically once daily on an empty stomach to enhance absorption. Dosage adjustments may be necessary in patients with renal impairment. It is essential to adhere to the prescribed regimen to prevent the development of viral resistance. Common adverse effects include headache, fatigue, dizziness, and nausea, which are generally mild and transient. Regular monitoring of liver function tests and HBV DNA levels is recommended to assess therapeutic response and detect potential resistance. Entavir should be used under medical supervision, and patients should be advised not to discontinue therapy abruptly to avoid viral rebound and hepatic exacerbation.