Q. My 13 year old cat is not eating much, sleeping a lot for the past 2 days. Had a rodent ulcer, and after a steroid shot, my vet put him on Zylkene.
DR. CHRISTIE LONG, D.V.M., C.V.A.
A. Certainly the rodent ulcer may be affecting his appetite due to the discomfort of eating. Have you tried offering soft/canned food? Zyklene is a supplement made from milk protein that may improve mood in stressed cats. I can't see how it would affect appetite, other than speculating that maybe he is lactose-intolerant (some of them are).
I would recommend calling your vet to discuss your cat's general condition right now. Most of them don't feel generally unwell (as you're describing) because of rodent ulcers, so I think maybe you'll have to consider doing some blood work and a urinalysis to see if anything else could be going on.