Definition
Acyclovir is an antiviral medication used to treat infections caused by herpes viruses, such as chickenpox, shingles, and genital herpes. It works by interfering with the virus's ability to replicate. Think of it as a weapon that disables the virus's copying machine. It reduces the severity and duration of outbreaks but doesn't eliminate the virus entirely. It is available in creams, pills, and injections.