Hello - my sugar boy was diagnosed at the end of January, and put on Vetsulin 2U every 12 hours. He went back for a fructosamine test 2 weeks later and they told me to up him to 3U. Luckily I had found this group and did not! At that time I also requested a change of insulin because of what I had read here. They wouldn't do it. So I am taking him to a new vet tomorrow, who prescribes Prozinc! I am super excited for Wyatt. Are there any suggestions on transitioning from one to another??? I'm glad I will be keeping the U40 syringes! Thank you!!