How is viral meningitis treated?

Acyclovir. The most serious viral infection is herpes. The only available treatment is acyclovir. Certain viral epidemics occur that may be protected by immunization shots. Most viral infections of the brain resolve on their own. Supportive care is the only and best treatment.
Not. Unless due to herpes simplex, most forms of viral meningitis are self-limited and there is little or any specific treatment indicated.