Drugs for the treatment of hepatitis B virus include tenofovir, entecavir, etc. It is recommended to use the drug under the guidance of a doctor, and its medication regimen is different for different conditions. Tenofovir is indicated for chronic hepatitis B in adults and children ≥12 years of age. The drug is a nucleotide reverse transcriptase inhibitor with inhibitory effects on human immunodeficiency virus (HIV) and hepatitis B virus (HBV). Adverse reactions to tenofovir include: rash, diarrhea, headache, weakness, etc. The product should be used with caution in patients with lactic acidosis and abnormal liver function. Entecavir is used for the treatment of chronic adult hepatitis B with active viral replication, persistently elevated serum alanine aminotransferase (ALT), or liver histology showing active lesions. The most common adverse events of entecavir are headache, fatigue, dizziness, and nausea. The dosage of entecavir may vary between dosage forms and sizes, so read the specific drug insert for use and take it as directed by your doctor. It is contraindicated in people who are allergic to entecavir or any of the ingredients in the preparation.