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My pet got Vetsulin with U-100 syringe instead of U-40. Is it okay?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 17 lbs

Stripes has diabetes and has been prescribed 2 units of vetsulin twice a day. I gave him his first dose two units, but they sent us home with u-100 syringes instead of u-40! So I'm SURE I under dosed him, and he was supposed to get it between 9 and 10 (it's almost 1). What is the appropriate amount in that syringe?! And do I give him the rest of the dose now or have I essentially killed him??!!

1 Answer

Most Helpful Answer

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Answered By Elva Ma DVM

Veterinarian

Published on March 3rd, 2018

Hello, and thank you for your question. Luckily, the concerns with underdosing are MUCH less serious than overdosing. I would not give him more insulin at this time. Instead, get your hands on the U-40 syringes ideally before his next dose, and administer his next dose as usual. If you cannot get the U-40 syringes in time for his next dose, I would just continue to administer the same number value using the U-100 syringes for now. As I said earlier, there will be minimal concerns with underdosing him for a few injections. At most, you may notice he is a bit more thirsty and has to pee a bit more often while he is getting the lower dose. I hope this helps, and that Stripes is doing well!

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