When my youngest Ragdoll was diagnosed with the feline virus, he had frequent sneezing, outbreaks of eye infections, and upper respiratory problems. This medicine helps to really control the virus by limiting outbreak and lessen the severity of them. He does not sneeze much at all anymore, does not have respiratory congestion anymore, and his eye infections are much less severe. If he gets an outbreak, his eye gets a little pink around the eyelids and he may have some matter in the corners. That is manageable. I would recommend this product to anyone whose pet is suffering from this herpes-related virus.