Penvir® 500 contains famciclovir, an antiviral medication that helps inhibit the replication of certain herpes viruses. After administration, famciclovir is converted into penciclovir, its active antiviral form, which interferes with viral DNA replication.

Famciclovir is commonly prescribed under physician supervision for the management of infections associated with herpes simplex virus (HSV) and varicella-zoster virus (VZV).

Treatment decisions, dosing schedules, and duration of therapy should always be determined by a qualified healthcare professional.