Were you looking for information about Zostavax? Zostervax is a common misspelling of Zostavax.
Zostavax® is a single-dose vaccine that is commonly given to people 50 years old and older to prevent shingles. It is a live but weakened version of the varicella-zoster virus. Zostavax causes the body to produce an immune system response to the virus, which helps prevent shingles. Potential side effects of Zostavax include injection site reactions and headaches.
(Click Zostavax for more information on how Zostavax works to prevent shingles, who should get the vaccine, and what you should know before getting vaccinated.)