Final answer:
Valacyclovir is the antiviral used for chronic suppressive therapy for genital herpes. It is a nucleoside analog antiviral drug that inhibits the replication and spread of the herpes simplex virus.
Step-by-step explanation:
The antiviral used for chronic suppressive therapy for genital herpes is valacyclovir. Valacyclovir is a nucleoside analog antiviral drug that is converted into acyclovir, a substance that inhibits the replication and spread of the herpes simplex virus. It is an effective treatment option for managing genital herpes and reducing the frequency of outbreaks.