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My cat's diabetic insulin pen doesn't do half doses. What to do?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 13 years and 2 months old | 12.5 lbs

My cat was recently diagnosed with diabetes and we're in the process of administering insulin twice a day and he is responding well - yay! My vet suggested we go with 3.5 units (using the Lantus Solostar pen) twice a day. However, the pen doesn't do half doses. Is it OK to give him 3 units in the evening, then 4 units in the morning until I get the syringes with half dose readings? I would ask my vet but it's now Saturday and he won't be back in the office until Tuesday. Thanks, Sarah

1 Answer

Most Helpful Answer

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Answered By Dr. Strydom, DVM

Veterinarian

Published on September 28th, 2019

Hi Sarah, I'm glad Neelix is responding well to treatment. Yes, it should be fine to do the dosing you described. Just be sure she eats first before giving the insulin. Watch her closely after the 4 unit dose to make sure her blood sugar doesn't go too low. If you notice anything abnormal then get her to an ER vet for an exam. Best wishes.

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