Oddly, human medications are often used on cats. One example is "Kitty Prozac"--Kitty is getting the same stuff as humans, but in smaller quantities. Actually, I've never done Kitty Prozac, and don't really approve of it, but when Harvey was acting up in the show rings, I had my vet prescribe Xanax and Valium--and--ta da!!!--they were exactly the same meds my pdoc prescribes for me. By the way, they didn't work, and Harvey is never going to have them again. But the point is that a lot of animal meds ARE actually human meds, too. The point is that you have to leave this to your vet. NO OTC meds, ever. As for pinkeye, in my distant past, when I was living with a Significant Other and a cat, yes, indeedy, we all came down with pinkeye at the same time. I seem to remember that we two Humans used the cat's eye ointment....and all three of us survived. I wouldn't think of doing such a thing now, but we were young and stupid. Eye treatment is cheap. Go to the vet. Please.