The cat should be monitored closely on the first 3 days on Lantus/Levemir: do curves between the AM and PM-doses, e.g. AM pre-shot, +3 hours, +6 hours, +9 hours, PM pre-shot. Generally the starting dose is kept for 3 days. Test for ketones daily. Cats that have a tendency to get ketones and/or who are getting relatively high flat curves after the switch should have their dose raised earlier (after 24-48 hours). It is extremely rare that a cat will need to have its dose reduced in the first 3 days, but if the cat falls below 50 mg/dl, reduce the dose.