It is HC. It was given because one of my cat's eyes was watering, no other sign of irritation but the clear liquid and squinting. Thanks! After 2 days it already seemed to have worked, so I'm not sure how long to use it.
You should definately use it for however long the vet said. Even if a pet looks better, always use the meds for as long as the vet prescribed....just to be sure everything is cleared up!