Valaforce 1000 is an oral antiviral prescription medication containing 1000 mg of Valacyclovir USP, primarily used to treat and manage infections caused by the herpes simplex virus (HSV) and the varicella-zoster virus (VZV). It works by stopping the replication and spread of the virus within human cells, which accelerates the healing of blisters, shortens the duration of an outbreak, and reduces underlying pain.