Famciclovir is a generic anti-viral used to treat symptoms of the herpes virus. Typically prescribed for humans, veterinarians often use to treat upper respiratory and ocular diseases in felines.
Famciclovir may improve clinical outcomes in felines infected with herpes virus type 1 (FHV-1).
This drug is FDA-approved for human use. However, it is common practice for veterinarians to prescribe such drugs for use in cats.