Has anyone had a cat experience an adverse reaction to prozinc? My cat is supposed to be getting 2 units twice daily. After a couple days, she began hiding from me and vomiting a bit after receiving her injection. I took her off the shot yesterday and there has been no more vomiting. The vet suggestedno insulin through the weekend and if no more vomiting, we restart prozinc at 1 unit twice a day. If the vomiting starts again we will have to re-evaluate her insulin. The vet says she has never seen such a reaction, but you never know. I am aware it could also be any number of other things causing her to vomit. Hard to isolate the cause just yet. Mama has only been on insulin since Friday last week.