Aciclovir, a type of antiviral drugs used to treat viral infections, is present in Zovirax Suspension 100 ml. In the treatment of genital herpes, a common sexually transmitted infection characterised by vaginal pain and sores, cold sores (an inflammatory blister in or near the mouth caused by infection with the herpes simplex virus), and herpes zoster (a viral infection that creates a painful rash), it is essential. It is also used to treat chickenpox in addition to this.