What should you know about side effects of varicella vaccine in adults?

Injection-site soreness, redness or swelling can make the arm uncomfortable for a short time. Fatigue, headache or a mild fever may follow as the immune system responds. A few chickenpox-like spots are possible. Adults should tell the vaccinator about pregnancy, plans for pregnancy, immune suppression, severe allergies and medicines that affect immunity, because these details can change whether vaccination is suitable or when it should be given. A reaction does not show whether the vaccine has provided complete protection.

Keep the day after vaccination flexible if you can, drink fluids and rest when tired. A cool compress may ease local discomfort. Check with a pharmacist or clinician before taking medicine for fever or pain if you have liver, kidney, stomach or bleeding problems. If spots appear, avoid scratching and ask whether you should limit close contact with people who have weakened immunity until the rash has settled.

Get emergency help for breathing difficulty, swelling of the lips, face or throat, collapse or widespread hives. Arrange prompt assessment for a high or persistent fever, a rapidly spreading rash, severe headache, marked weakness or symptoms that are getting worse. Speak to your clinician before a further dose if you had a serious allergic or neurological reaction after vaccination.

Ask whether your health conditions or medicines affect eligibility, how to handle a rash, when the next dose is due, and what contact precautions apply if someone at home is immunocompromised.