The vaccine reduces the risk for people 60 and older by about half. They haven't really reccommended it for people 50 thru 59 as of yet. For that group certain criteria is considered.

Antiviral medicines work really well for most people who get shingles (taken with 3 days). It worked great for someone I know. That's what would be done if the person ever got them again. No vaccine. There can be side effects from the vaccine.