The cost of entecavir is usually around $150, with some variation in price due to different consumption levels, sources of supply, and specifications and manufacturers of entecavir production in each location, and reimbursement through chronic management for some eligible patients. Entecavir is available in tablets and capsules, and its main ingredient is entecavir, which is mainly used for hepatitis B patients to control viral replication in the body. Entecavir is a prescription drug and may cause adverse reactions during use, such as headache, abdominal pain, nausea and fatigue. Entecavir is contraindicated in people who are allergic to entecavir or any of the ingredients in the preparation, pregnant and lactating women, children under 16 years of age, and elderly people 65 years of age and older should be cautious about using this product. Note that Entecavir must be taken on an empty stomach and cannot be taken with other medications. It is recommended to use the drug correctly under the guidance of a doctor to avoid adverse reactions.