My cat Leo has been diabetic for over 2 years and the Vet recommended Lantus. Leo's BG was about 275 mg/dl. Even though his daily insulin has increased from 2+2 units up to today's 6+5 units it still fluctuates and remains similar to 2 yeas ago with fluctuations. Some days BG at 6 hours after his first shot can be as low as 6.4 and the next day it could be 15.4. I read that Lantus can create these type of fluctuations and that Levemir is much more stable for some cats. My problem is how to change over to Levemir in a safe manner. I would appreciate any help you can offer. Thank you.