What should you know about hepatitis B 3 shot series?

Each injection presents hepatitis B vaccine material to the immune system without causing hepatitis B infection. The later doses reinforce the response created after the earlier dose. The schedule may be adjusted for age, health conditions, occupational exposure, pregnancy, or a local vaccination programme. A delayed appointment does not usually mean the series must start again; the clinic can determine the next dose from your record.

Vaccination prevents infection; it does not treat an existing hepatitis B infection. If testing is part of your care, results may include more than one marker and need to be interpreted together. Learn more about [Hepatitis B](/conditions/hepatitis-b/).

Keep the vaccination record, bring it to future visits, and tell the vaccinator about a previous serious reaction to a vaccine or current illness. Soreness at the injection site, tiredness, or a mild fever can occur after vaccination; ask the clinic what symptom relief is suitable for you. If you miss a planned dose, contact the vaccination service and give the dates already recorded rather than booking an entirely new series. More detail is available in [Hepatitis B Vaccination](/treatments/preventive-care-and-vaccination/hepatitis-b-vaccination/).

Seek urgent help for trouble breathing, swelling of the face or throat, fainting, or widespread hives after an injection. Contact a clinician promptly for yellowing of the eyes, very dark urine, severe weakness, or persistent vomiting, because these symptoms need assessment rather than an assumption that they are vaccine effects. [Dark Urine](/symptoms/dark-urine/) and [Fatigue](/symptoms/fatigue/) can have many causes.

Ask which schedule applies to you, what to do if a dose is late, whether testing is needed, and how your vaccination record will show completion. If hepatitis B is a concern, ask whether a [Liver Function Test](/treatments/diagnostics-and-screening/liver-function-test/) or other blood tests are appropriate.