Hi Tammy,
We spent quite a while developing a protocol for ProZinc, for which we had consensus. We spent several days on a Think Tank thread getting everyone's viewpoint and consolidating those ideas. One of our guiding principles was that Every Cat is Different and over the years, we have certainly seen many different responses to the insulin. So we tried to offer options and no blanket statements except for hypo numbers and other safety situations. The protocol is at the top of this page.
While your vet's guidelines might have worked well for your cat, we like to err on the side of safety and feel"first do no harm" is a wise standard.
As this is a peer reviewed board, I disagree with your vet's ideas
Our usual standard is not to shoot under 200. Then after you have lots of data, you might lower that number to 150-180, on a cycle you can carefully monitor. We have had a very few people who found it necessary to shoot under 150 - after they had months of data - and could monitor very carefully. Those people are only shooting drops of insulin by that point.
There have been lots of cats who have done well with the same dose for a week, but there have also been cats who do well with the sliding scale. That's why we advocate both approaches.
As it states in the protocol, we do suggest increasing by .5 units at a time, IF the cat is in high flat ranges and definitely seems to need more insulin But if the cat is in lower ranges and the levels are not varying by much, an increase of 0.25 may be a much safer increase and might, in fact, be the perfect dose that cat needed. Many cats here right now are in lower ranges and are increasing by 0.1 Again, we feel strongly that ProZinc is an insulin that can be adjusted to fit the cat, and that ECID.
We are always looking for people to join our little PZI/ProZinc family and we'd love to have you post. But I would ask that you use the FDMB and PZI guidelines that are most likely to keep someone else's cat safe: Remember that your cat and his response was unique and so is everyone else's kitty. And be aware, first and foremost, that you want their cat to be safe and so, offer advice that will first, do no harm.