Acyclovir(Zovirax®) is an antiviral medication that is available by prescription only.
Acyclovir works by stopping the spread of viruses in the body. Acyclovir works against the varicella virus that causes chickenpox and shingles and the herpes virus that causes genital herpes (HSV-2) and cold sores around the mouth (HSV-1).
Acyclovir is commonly prescribed in the following cases:
Acyclovir will not cure herpes or chickenpox and may not stop the spread of viruses to other people, but it will reduce the duration of illness.
Acyclovir is available as a tablet, a capsule, and a liquid suspension. It is usually taken with or without food two to five times a day for 5 to 10 days, starting as soon as possible after your symptoms begin.
When acyclovir is used to prevent outbreaks of genital herpes, it may be recommended for use for several months.
Take acyclovir exactly as directed by your doctor. Do not take more or less of it or take it more often than prescribed by your doctor.
Reference: National Library of Medicine