My son has chicken pox can i take zivorax pills before the appearance of any symptoms to avoid it or at least reduce its effect?

Acyclovir for VZV: It is recommended that so, e persons at increased risk for moderate to severe varicella be considered for oral Acyclovir treatment. These high risk groups include healthy persons older than 12 years old, those with chronic cutaneous or pulmonary disorders, on steroids. Some health care providers may elect to use oral Acyclovir for secondary cases within a household.