Petco Text Logo
Petco Pet Logo
  • Two Easy Ways to Start Earning Rewards!

    rewards header
    Become a member today!
    Members-only pricing and offers, personalized care notifications, Vital Care points back on every purchase and more!
    Petco Pay LogoBecome a credit card member today!

    Earn 2X Pals Rewards points at Petco
    when you use Petco Pay!

    APPLY NOW
    Learn More About Petco Pay Benefits

How much Vetsulin U40 for my diabetic cat & when to check blood?

Updated on September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 8 years and 3 months old | 15 lbs

My newly diabetic cat get Vetsulin U 40. Vet says increase slowly and watch for signs of improvement. His blood-glucose level is an average 246. On a U 40 syringe, I'm up to #5 on the lines, is the 5 units? How much insulin should I be giving him? What's the best time to check his blood-glucose? Does his eating before or after blood checks make a difference? Help! Thanks!

1 Answer

Most Helpful Answer

Lindsey Edwards MVB, BSc, IVCA

Answered By Lindsey Edwards MVB, BSc, IVCA

Veterinarian

Published on August 30th, 2019

If the insulin and syringe is U40 then yes, 5 should be 5 units (it is important to use the same graded syringes and insulin as this would invalidate the graduations otherwise). Blood glucose should be checked resting and fasting as a meal or strenuous exercise will affect readings - a schedule of timings before meals/exercise should be arranged in order to compare readings. Changes the the dose rate given should be made only in consultation with the treating vet - we are not legally in a position to prescribe medication as the animal must be under the direct care and supervision of the prescribing vet in order to make these decisions
Vote Icon1Pet Parents found this answer helpful

Smart Picks for Smart Questions

Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Share

Styled arrow button