It is best not to administer the hepatitis B vaccine to a child who has been off medication for one day, as the medication may not have been fully metabolized in the body, and it is recommended that the hepatitis B vaccine be administered after evaluation by a medical professional. When a child stops taking medication for one day, the medication may not have been fully metabolized in the body, and hepatitis B vaccination may cause adverse reactions, which may easily affect the child’s health. If a child has not fully recovered from the medication, it is recommended to wait until the child has fully recovered from the disease and the medication has been metabolized by the body before administering the Hepatitis B vaccine after evaluation by a medical professional. Hepatitis B vaccination for children should be administered under the supervision of a medical professional.