What should you know about side effects of varicella vaccine?

Tenderness, redness or swelling where the injection was given can occur after vaccination. Some people feel tired, develop a mild fever or notice a few chickenpox-like spots. These effects reflect an immune response and generally settle without specific treatment. The vaccine uses a weakened form of the virus, so a limited rash is different from full chickenpox, but it should still be mentioned if it spreads or you feel unwell. A person with a weakened immune system may need individual advice before vaccination.

Rest, drink fluids and keep the injection area comfortable. Wear loose clothing if the arm is tender. Ask a pharmacist or clinician which medicine is suitable for fever or discomfort, especially for a child or someone with other medical conditions. Avoid scratching any spots and tell your healthcare team about the timing and appearance of a rash. Keep your vaccination record so future doses and advice can be checked.

Call emergency services for difficulty breathing, swelling of the face or throat, collapse, or widespread hives soon after vaccination. Seek prompt medical advice for a high or persistent fever, a rapidly spreading rash, unusual bruising, severe weakness, or symptoms that are worsening instead of settling. Contact a clinician before another dose if you had a serious reaction previously.

Ask how to manage fever or arm soreness, whether your medicines or immune condition change the advice, when another dose is due, and whether you should take precautions around someone with a weakened immune system.