This article is from the Childhood Vaccinations FAQ, by Lynn Gazis-Sax firstname.lastname@example.org with numerous contributions by others.
Yes, but it is only available to people at especially high risk from
chicken pox. It needs to be given within 72 hours of exposure. More
common on misc.kids is the concern of adults who haven't had chicken
pox, but aren't otherwise at high risk from exposure. The varicella
immune globulin isn't likely to be available to these people, but
something else is available: acyclovir. This antiviral drug will
lessen the severity of chicken pox if it is given promptly, as soon as
the rash first begins to appear.