What Is the Correct Acyclovir Dosage? Acyclovir, also known as “acyclovir”, is an antiviral drug used to treat infections caused by the herpes virus (herpes simplex), such as cold sores and genital herpes. It is also used to treat chickenpox and shingles. If you have herpes, chickenpox, or shingles, using acyclovir can reduce the severity […]