Primovir Tablet is a prescription antiviral medicine used to treat herpes simplex virus (HSV) infection. It can be used to treat HSV-1 or HSV-2 and can be taken either as a tablet or suspension. It also controls cytomegalovirus (CMV) infection in individuals with HIV. Primovir is available in generic form. If you are taking Primovir for the first time, starting the treatment as soon as possible after you encounter symptoms is necessary. Primovir is an acyclovir prodrug that is converted into acyclovir in the body. Acyclovir is a nucleoside analogue that inhibits HSV replication. Primovir effectively treats HSV infections and has fewer side effects than other antiviral medications.