My 6-year old cat was diagnosed with feline diabetes a month ago. I am trying to learn all I can about feline diabetes. My vet has been very helpful in explaining a lot to me, but I would like to learn as much about it as I can. He is at the vet's now. Apparently the insulin was bad. I know that I did not drop it and it was refrigerated all the time except for removal to load the syringe for injection. Just spoke with the vet and my cat is improving quickly with a new bottle of insulin.