What should you know about the hepatitis B vaccine?

Hepatitis B is a viral infection that can affect the liver. Vaccination prepares immune defences to recognise the virus before an exposure occurs; it does not treat an infection that is already present. Protection develops according to the schedule recommended by the clinician, so completing the course matters.

Some people need vaccination because of work, household or travel exposure, medical conditions or other personal circumstances. A clinician can explain the schedule and whether testing is appropriate. Learn more about Hepatitis B and Hepatitis B Vaccination if you want the wider context.

Tell the vaccinator about previous doses, a past reaction to a vaccine, current illness, pregnancy or medicines that affect immunity. Keep the appointment record so later doses can be timed correctly. A sore arm, mild tiredness or a short-lived temperature can occur after vaccination; follow the clinic's advice for comfort and observation.

Vaccination does not replace safer choices around blood or body fluids. If you may have had a recent exposure, seek medical advice promptly because vaccination and other assessment may be time-sensitive.

Get urgent help for trouble breathing, facial swelling, widespread hives, collapse or severe weakness after a dose. Arrange medical review for ongoing jaundice, Dark Urine, unusual Fatigue, abdominal discomfort or other symptoms that could reflect liver illness; vaccination should not be used to explain them away.

Ask which schedule fits you, whether previous doses count, whether testing is needed and what to do if an appointment is missed or an exposure occurs.