Ok. My cat was on ProZinc after trying the Glipizide tablets when she was first diagnosed on March 13th, and then she went to Vetsulin, which was recalled due to the zinc in it not working right. Then, she was given ProZinc. Now, she's on Lantus, as of July 25th. This is how she got there:
Blackie was put on the Hill's Prescription W/D dry formula per the vet when she was first diagnosed with diabetes. The vet checked her BG's each week, and each week increased her insulin by a unit. We were told to NOT hometest her as they wanted to do it themselves. At the time of the last vet check, she was at 8u BID AND on high carb dry food. NOT a good mix. At the time, I suggested that I wanted to put her on Fancy Feast wet food. Vet was fine with the wet food, but not with the brand of food. She wanted us to give Blackie the Hill's Prescription W/D wet instead, and STILL keep her on 8u BID of ProZinc. I told vet that we'll try that for a week, and see, and after that I want Blackie to start eating Fancy Feast. That Saturday, Blackie was fine. Sunday, Blackie was fine, but I started doing some research and found this message board. Someone on here contacted me offboard, and offered up a hometesting kit. She came to visit Monday and showed me how to hometest. Blackie was fine Monday. Blackie was fine Tuesday morning. Still eating the same food. Tuesday afternoon, her #'s went dangerously low (down to 21, she was having a hypoglycemic episode) which resulted in eating high carb food and having a high dose of ProZinc. I was on the phone with my friend immediately, and together we got her back up to more manageable #'s. That very same night, I immediately dropped Blackie's insulin to 1u BID, AND switched her food to Fancy Feast. Called the vet up Wednesday morning, and told her what had happened. Vet said that she would've dropped the insulin down 1/2 (making it 4u BID), and I said that I dropped it down to 1, and am starting over (Start Low, Go Slow is this board's motto, and they're right). I started a spreadsheet, and started hometesting Blackie each day and every day. She gets 2 1/2 to 3 cans of Fancy Feast each day (I'm monitoring her weight), and some boiled chicken as treats.
She arrived at Lantus after over a month of trying to regulate her on ProZinc, and after countless suggestions from the board members, and my friend. I'm glad that I listened because she's now getting lower #'s, and I'm still working on getting her regulated.
I HIGHLY recommend getting your cat off that high carb food, and getting him/her to eat something very low in carbs (ie. 3.9% Turkey & Giblets by Fancy Feast is a good one, or others on here can suggest something, plus you can got to Binky's page, too... Just make sure it's very low wet carb food, whatever it is), before he goes into a hypoglycemic episode. DO keep that high carb food around (preferably canned with the gravy, and perhaps some kibble so that you can give 1 or 2 kibbles to help bring up his #'s should they go low), keep some honey around, too. In case you need to hand syringe feed him, the honey will help. Just a very small amount on the gums or tongue can help bring up the #'s.
High amount of ProZinc BID with the high carb food is a very dangerous mix. I know. I've been there, and I'm sure that others have, too. Good luck.