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

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Usually arrives in 3-5 days
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Medications ship separately. Delivery times may vary.

About This Item

Details

Insulin Syringes/Needles U-40 29 Gauge x 0.5-in are prescribed by your vet for the injection of U-40 (40 units per ml) insulin in your diabetic pet. However, its important to note that more than one concentration of insulin exists, so be sure that the syringe used matches the type of insulin prescribed for your pet. These sterile, single-use, individually packaged syringes feature an attached needle, polypropylene barrel and plunger rod, latex-free plunger tip, and graduated barrel markings.

We directly source prescription medications from manufacturers and wholesale distributors registered with the FDA and licensed by applicable state boards. Guaranteed genuine, and where applicable, backed by the manufacturer.

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4.6
Rated 4.6 out of 5 stars
746 Ratings
Terms & Conditions

Customers Mention

Chewy identifies key considerations with the help of artificial intelligence and our veterinarians.

Ease of Use

83% Positive

Effectiveness

79% Positive

Ingredients

83% Positive

Long-Term Benefits

83% Positive

323 Customer Reviews

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.

Rated 3 out of 5 stars
By Dorene on Jan 7, 2026

Changed

I agree with some of the other posters. The needle has changed. It's more difficult to get the needle in to the cat. It feels like it's resisting entering the

I agree with some of the other posters. The needle has changed. It's more difficult to get the needle in to the cat. It feels like it's resisting entering the skin. I run the needle through an alcohol swab first and it doesn't go through that very easily. ????? It's a thin alcohol wipe. Makes no sense. Will have to reconsider product.

Rated 5 out of 5 stars
By Tracy on Nov 12, 2025

Sharpness is Incredible = painless

Very high quality needles made of quality metal they do not bend before you even get the liquid in them and the needles like I said are so sharp that it's so easy

Very high quality needles made of quality metal they do not bend before you even get the liquid in them and the needles like I said are so sharp that it's so easy to give an insulin injection to Cisco. And the price you have is so very reasonable thank you chewy!!!!!

Rated 5 out of 5 stars
By Ruthann on Jan 6, 2026

Easy to use

These syringes are easy to use & I appreciate that they are each in their own packaging.

These syringes are easy to use & I appreciate that they are each in their own packaging.

Rated 1 out of 5 stars
By Claudia on Aug 25, 2025

Warning!

The making of these needles has changed! I have been subscribed to getting these for a few months but this last box that came in 8/2025 was different. You could

The making of these needles has changed! I have been subscribed to getting these for a few months but this last box that came in 8/2025 was different. You could tell the caps are lighter in color, I just did not think they would be cheaper too. I had to recap my needle (once I did not end up using the needle and second time I did not have the sharp container close by) both times the needle went through the cap piercing my finger. Please be careful using these cheap needles and I know you should not recap needles but when you absolutely need too, the needle should not be going through its caps!

Rated 5 out of 5 stars
By Birgit on Nov 16, 2025

Great packing.

They arrived in just a couple of days. When your fur baby is diabetic, it's important to get the things he needs quickly.

They arrived in just a couple of days. When your fur baby is diabetic, it's important to get the things he needs quickly.

Rated 2 out of 5 stars
By Janice on Oct 16, 2025

Needle not sharp and/or needle bent.

I wasted so much insulin and needles. They wouldn’t penetrate and/or bent when I tried to give insulin shots. First order was good, but they changed the needle on

I wasted so much insulin and needles. They wouldn’t penetrate and/or bent when I tried to give insulin shots. First order was good, but they changed the needle on the 2nd order and it was poor quality.

Rated 3 out of 5 stars
By Won on Jul 11, 2025

The Syringes Changed

This was my syringe of choice for years unless it was out of stock. The distributer was Covidien and made in the US. Now (June, 2025) it's distributed by Cardinal

This was my syringe of choice for years unless it was out of stock. The distributer was Covidien and made in the US. Now (June, 2025) it's distributed by Cardinal Health. I don't mind which company made it, but I am noticing I need to use a little more strength to pierce my cat's skin. I change the injection sites every time, and I barely had to use any strength with the previous versions. I feel like I'm pressing harder to inject the needle into the insulin vial also. Both versions are 29G, and maybe my cat's skin changed or I'm getting weaker?!! I'm curious to read what others who used this think, but I'll switch the brand for now then try it again someday. Hopefully I can add more stars to this review in the future.

Rated 2 out of 5 stars
By Angela on Nov 22, 2025

Changed product

These syringes were great but the product has recently changed and the new design is not as easy/safe to use.

These syringes were great but the product has recently changed and the new design is not as easy/safe to use.

Rated 5 out of 5 stars
By Marlee on Sep 8, 2025

Scout’s syringes

This was a re supply of our dog’s syringes for her insulin. First box came from the vet. Same exact box but much cheaper than the vet! Vet approved the prescription

This was a re supply of our dog’s syringes for her insulin. First box came from the vet. Same exact box but much cheaper than the vet! Vet approved the prescription from Chewy same day. Will definitely reorder!

Rated 5 out of 5 stars
By Elizabeth-Donald on Jul 20, 2025

Necessary Cat Medicine supplies.

When our prosperous Veterinarian could not get these Insulin Syringes on time, our Vet approved the prescription for Chewy to fill. Chewy had these needed Medical

When our prosperous Veterinarian could not get these Insulin Syringes on time, our Vet approved the prescription for Chewy to fill. Chewy had these needed Medical supplies. My husband called Chewy & the prescription was delivered. Try not to panic when animal needs are hard to meet, call Chewy & they will do everything they can to help you for your animal needs. Written of our own free will & experience with Chewy Company.