Side effects of the hepatitis A and B vaccine

Vaccination activates the immune system, so soreness, redness or swelling where the injection was given can occur. Some people feel tired, achy, mildly unwell or develop a headache, nausea or a slight fever for a short time. These reactions are not hepatitis A or hepatitis B infection. Dark urine, yellow skin, persistent vomiting, worsening abdominal pain or ongoing loss of appetite are not typical simple injection reactions and need medical advice, especially if they are accompanied by feeling generally unwell.

Rest, drink fluids, and use a cool cloth on a sore injection site. Gentle movement of the arm can reduce stiffness. If you need pain relief, check that your chosen medicine is suitable for you, particularly if you have liver disease, take other medicines, or have allergies. Keep your vaccination record and attend any appointment needed to complete the recommended course. A Hepatitis A Vaccination page can explain the preventive purpose and schedule.

Call emergency services for trouble breathing, swelling of the face or throat, widespread hives, severe dizziness or collapse soon after vaccination; these can signal a serious allergic reaction. Contact a clinician promptly for persistent high fever, severe weakness, repeated vomiting, yellowing of the eyes or skin, or dark urine. A clinician may review your symptoms and consider a Liver Function Test when liver-related symptoms need checking.

Ask which reactions are expected, what to use for discomfort, whether allergies or previous vaccine reactions affect your next dose, and when to seek review for symptoms that last.