> Western Medicines > Entecavir


Used for: Hepatitis B virus infection
Chinese name:

What is Entecavir for?

Entecavir is a nucleoside analog that can decrease the amount of hepatitis B virus in your body by suppressing the replication of viruses. It is used to treat chronic hepatitis B in patients with both compensated and decompensated liver disease, and for preventing hepatitis B after a liver transplant.

How to use it?

Entecavir can be taken by mouth as tablets.


If you have compensated liver disease, you should take 0.5 mg once daily.


If you are resistant to Lamivudine or have decompensated liver disease, you should take 1 mg once daily. Dosage of Entecavir is adjusted based on your kidney function.

What are the side effects of Entecavir?

Common side effects of Entecavir include diarrhoea, dizziness, nausea and vomiting, drowsiness, indigestion, fatigue, headache, and insomnia.

Who should not take Entecavir?

No specific situation or population in which Entecavir should not be used are reported.

Pharmacist Tips:

  • You should be on adequate contraception while taking Entecavir.
  • You are advised to avoid drinking alcohol.
  • Seek medical attention right away if you develop nausea or vomiting with stomach pain, difficulty breathing, feel very tired, weak or dizzy as they are symptoms of a serious side effect (lactic acidosis).

Common dosing schedule:
Entecavir should be taken on an empty stomach, at least 2 hours before or after a meal.


This schedule is for reference only, adjustments may be made according to individual needs.


Some common medications Entecavir may interact with:

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Entecavir in Hong Kong?

In Hong Kong, Entecavir is a prescription only medicine, and requires a prescription from a doctor to be purchased in a pharmacy. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.


For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at https://www.drugoffice.gov.hk

Need more information?

For detailed information about the use of Entecavir in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.

Brands in Hong Kong
Available dosage
  • 0.5mg / 1mg (Tablets)
Drug class
Sub class
Nucleoside Analogues
Other drugs in same class