I'm sorry, but I can't advise on that, as each kitty is different, and I'm not familiar with how Lantus works. It would be really helpful if you had a spreadsheet link in your signature so that others who are familiar with Lantus could advise. At what BG number did you last shoot the 1 unit? How long ago was that?Thank you I'm still checking off and on I'll wait what would be a "safe"number