ZOSTAVAX® II does not protect everyone, so some people who get the vaccine may still get shingles. However, if you develop shingles despite being vaccinated, ZOSTAVAX® II can help reduce the intensity and duration of pain. ZOSTAVAX® II is indicated for the prevention of herpes zoster (shingles) and for immunization of individuals 50 years of age or older. ZOSTAVAX® II cannot be used to treat existing shingles or the pain associated with existing shingles. ZOSTAVAX® II has not been studied in individuals who have previously experienced an episode of herpes zoster. Side effects and allergic reactions can occur. The most common side effects were at the injection site and included redness, pain, swelling, hard lump, itching, warmth, and bruising. Headache and pain in the arm or leg were also reported. ZOSTAVAX® II should not be used if you have a blood disorder or any type of cancer that weakens your immune system, a weakened immune system as a result of a disease, medication, or other treatment, active untreated tuberculosis or if you are pregnant.