Hepatitis B vaccine for adults is given in 3 injections, the first, the 1st month and the 6th month. For adults, it is necessary to take the hepatitis B two-half test, if all five items are negative, it means the body has no immunity to hepatitis B, and it is recommended to take the hepatitis B vaccination. Adults need to receive three injections of Hepatitis B vaccine, which need to be given at different times, with the second and third injections being given one month and six months after the first injection respectively. Antibodies to the hepatitis B virus are produced after the injections. Adverse reactions such as pain, hardness, redness, swelling, itchy rash, etc. may occur after vaccination, which can be relieved on their own. Family and personal history of convulsions, people with chronic diseases, people with a history of epilepsy, and people with allergies should use the drug with caution. Those who develop abnormalities such as high fever and convulsions after the 1st injection of this product are not recommended to continue the injection. The use of this drug is prohibited in people who are allergic to this vaccine or the components of the formula, people suffering from acute diseases, severe chronic diseases, acute exacerbations of chronic diseases and fever. After vaccination, you need to stay at the vaccination site for about 30 minutes to observe the vaccine and go home only after there is no abnormality. Bathing is not recommended within 24 hours after vaccination, and care should be taken to keep the needle hole dry and clean to avoid infection.