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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

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!

2Pet Parents found this answer helpful

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