Acyclovir is an antiviral drug. It slows the growth and spread of the herpes virus so that
the body can fight off the infection. Acyclovir will not cure herpes, but it can lessen the
symptoms of the infection.
Acyclovir is used to treat infections caused by herpes viruses. Illnesses caused by herpes
viruses include genital herpes, cold sores, shingles, and chicken pox.
Acyclovir may also be used for purposes other than those listed in this medication guide.