Please consult your physician before taking any medication. Zovirax/acyclovir Generic 200mg 25 Tabs Generic Name: acyclovir (oral) (a SY klo veer) Brand Names: Zovirax What is acyclovir? 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.