MERCK Insulin Syringes U-40 0.5-in x 29G, 0.5-cc, 100 syringes -

Merck Insulin Syringes U-40 0.5-in x 29G

By Merck
Rated 3.1714 out of 5 stars
Prescription Item

$48.99Chewy Price
This item requires prescription approval.

Medications ship separately. Delivery times may vary.

In Stock
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About This Item


Help deliver your pet’s insulin with ease by using Merck’s U-40 Insulin Syringes. Each box comes with 100 needles that are designed to be used with Vetsulin (porcine insulin zinc suspension) 10 ml. or 2.7 ml. These single-use devices are designed for both canine companions and feline friends and are completely sterile, nonpyrogenic and non-toxic. Choose between a 0.5 mL-29 G x 1/2-inch fixed needle or a 1 mL- 29 G x 1/2 -inch fixed needle.

Proudly sourced directly from the manufacturer or their approved distributor. Guaranteed genuine and backed by the manufacturer.

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ReviewsWrite a Review

Rated 3.1714 out of 5 stars
35 Ratings
Would recommend to a friend

35 Customer Reviews

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.
Rated 5 out of 5 stars
By Sue on May 11, 2023

Insulin syringes

So much easier than going to my vet after ordering them ahead!

Rated 2 out of 5 stars
By Jf22 on Nov 11, 2022

OK for back up if I run out of regular ones

These are ok, I don' like the red lines. It's really hard to see the lines when filling with vetsulin. Black lines are better. The overall quality is not as good at the Monoject syringes that I usually use.

Rated 1 out of 5 stars
By Benjamin on Nov 15, 2022

Bad needles

Needles not sharp also they leaked price also changed to much will not use again vet is cheaper quality it also better chewy do better you are gonna go out of business like that

Rated 3 out of 5 stars
By Jeanne on Oct 25, 2022

Compare Products

These needles seem to be a bit flimsier than the MonoStat needles which were my regular purchase. Also, the red unit numbers are much more difficult to see. If there were no other choice, I would purchase again.

Rated 4 out of 5 stars
By Jill on Nov 11, 2022

Insulin syringes

The syringes are fine, I just wish I could get discounts, its very expensive between syringes and insulin

Rated 1 out of 5 stars
By Oldguy on May 1, 2022

More expensive is not always better

These syringes are individually wrapped in a sanitary plastic package, which is a pain in the neck. They are extremely small in diameter, which makes them feel flimsy and bend easily. The markings are printed in light red color, which makes them hard to read and easier to mistake. There is no safety cap over the end of the plunger. All factors considered, I much prefer the common Vetsulin syringes.

Rated 5 out of 5 stars
By Davis on Aug 10, 2022

Great product

Great product great price compared with other services and fast delivery

Rated 1 out of 5 stars
By Lovemydog on Jan 27, 2022

Not a good syringe

After almost a year of managing insulin injections, my helpers and I are skilled at administering them without hurting the dog. But with the Merck syringes, my dog yelped every time and started to get nervous when she knew the shot was due. Worse, several times I saw insulin dripping from the needle tip just before injection making it impossible to know how much of the dose the dog actually received. A glucose check at the vet showed she wasn't getting enough. I bought another brand of syringe from the vet and have had no more problems. Painless and no drips. Insulin injections are crucial to the health of my dog . A syringe that a) hurts her and b) does assure accurate delivery after being carefully measured is unacceptable. I will not order them again and would advise others not to.

Rated 3 out of 5 stars
By TimB on Jan 10, 2022

Weak quality

As others have mentioned, the quality on these is pretty iffy. They get the job done, but the needles are sometimes not straight to the syringe and there are rough edges on the plastic cap and syringe. I'm a little more than half-way through a box of 100 and had to discard two immediately for quality issues. For the cost, these seem like they should have better quality. Lastly, the syringes are individually wrapped which some may like, but I find to be 'just more garbage'. Less focus on the packaging and more on the quality would be my input.

Rated 1 out of 5 stars
By Kate on Jan 13, 2022

Not very sharp

Not only do these leak from the tip, and don't seem very well made, they also don't seem as sharp as the brand I got from my vet. My cat has started flinching when she gets her insulin injections, which she never did before. Sometimes I can't tell if the insulin actually got into her or just leaked out onto her fur. I'm switching brands.