Studies show it speeds up recovery from upper respiratory disease.

Note: Famciclovir does not kill the virus permanently; it manages symptoms and reduces flare-ups. Dosage and Administration

It is well-tolerated by cats, with fewer risks than older antiviral drugs like valacyclovir. When Do Cats Need Famciclovir? Veterinarians typically prescribe famciclovir for: Severe primary FHV-1 infections in kittens.