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

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Count: 100 syringes
Size: 1 mL
  • Click to select 0.5 mL

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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.


Vetsulin U-40 Insulin syringes are disposable syringes used to administer Vetsulin to your pet.


Vetsulin should not be used in dogs or cats known to have a systemic allergy to pork or pork products. Vetsulin is contraindicated during periods of hypoglycemia. Keep out of reach of children. As with all insulin products, careful patient monitoring for hypoglycemia and hyperglycemia is essential to attain and maintain adequate glycemic control and prevent associated complications. Overdosage can result in profound hypoglycemia and death. The safety and effectiveness of Vetsulin in puppies and kittens, breeding, pregnant, and lactating dogs and cats has not been evaluated. See the package insert for full information regarding contraindications, warnings, and precautions

This item is excluded from the first-time Autoship promotion.

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  • Item Number
  • For Use With
    Dogs & Cats
  • Common Brand Name(s)
  • Generic Name
    Insulin Syringes
  • Administration Form
  • Brand
  • Lifestage
  • Product Form
  • Health Condition
  • Drug Type
    Devices & Supplies
Recommended Dosage

Use according to your veterinarian's instructions.

Storage Instructions

Syringes should be kept out of the reach of children and pets.


How are doses measured?

Doses of insulin are measured in units: 40 IU/mL insulin contains 40 International Units (IU) per milliliter (mL) (1 mL = 1 cc).

How do I prepare the dose?

After washing your hands, take the Vetsulin (porcine insulin zinc suspension) vial out of the refrigerator. Shake the vial until the insulin is uniformly milky, allowing any foam to disperse.

  1. Carefully remove the cap from the needle and insert the needle into the vial.
  2. Turn the vial upside down, making sure the tip of the needle remains in the vial.
  3. Withdraw the correct dose into the U-40 insulin syringe.
  4. Before removing the needle from the vial, check the syringe for any air bubbles.
  5. If bubbles are present, hold the syringe up and tap its side until the bubbles float to the top. Push them out with the plunger and withdraw the correct dose.
  6. Remove the needle from the vial.

How should I inject my pet?

  1. Injection should be given under the skin, 3/4 to 2 inches from the middle of your cat's back, varying from behind the shoulder blades to the middle of the back region and alternating sides.
  2. Gently insert needle in center of folded skin.
  3. Push plunger until all of the insulin is given.
  4. Pull needle out and dispose of syringe into appropriate sharps collector.
  • Injection point can depend upon your veterinarian's recommendation and what is best for you and your cat.

  • Alternate injection site between left and right side for comfort and best results. Repeat injections at the same site can lead to ineffective treatment.

  • If only a partial dose is given, do not attempt to re-dose. Wait and give your cat its usual dose at the next injection time.

Rating: 3.5 of 5 stars 9 Reviews 9 Reviews 3.6 out of 5 Stars

78% Recommend

78% of reviewersrecommend this product

Rating: 3.5 of 5 stars 3.6 / 5

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9 Reviews

Showing 9 Reviews

  • 5 out of 5 stars

    superior syringes for my dogs diabetes

    By on

    My dog, Wilma, would cry out when we used syringes of lesser quality. The Vetsulin U-40 syringes are more expensive but worth the extra money not having her cry out in pain when we have to inject her with Vetsulin twice a day. Wilma was an older doxie mix we adopted from our local So CA shelter. She had been found lost and wandering in the lower desert area. She became sick about a year after we adopted her and barely survived diabetic Keto Acidosis.

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  • 5 out of 5 stars

    Exactly what I needed

    By on

    Was authorized by prescription very quickly. Thank you!

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  • 5 out of 5 stars

    no reason for these to be so expensive

    By on

    I like the needles. They're fine. BUT, these needles should cost no more than $15.00 for 100 in the cardboard box. Something is amiss here. There are plenty of other places that, even paying shipping, will cost about 1/3 of this price.

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  • 1 out of 5 stars

    diabetic pom owner

    By on

    Why the heck are these syringes now so expensive! Syringe is less handy to use. Where is the plastic box unit where you can put yourvsyringes into? Totally not biting from Chewy these any more!

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  • 2 out of 5 stars

    Merck syringes

    By on

    New syringe design lacks features of earlier model by same manufacturer. That is: the plunger is smaller and harder to grasp. Also, the red measurement lines are faint and difficult to read.

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  • 4 out of 5 stars

    Insulin syringe

    By on

    We are titrating our dogs insulin so need the 40u and bought this size(20u) by mistake. So I am at 16u and barrel is almost full, feels too long to handle. Other than that, I like that they are individually wrapped in paper, less chance of poking self. Easy to read markings and smooth injection. In general with syringes, It is not always clear what amount insulin syringe holds, make sure before you choose!

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  • 3 out of 5 stars

    10 pks of 10 in a box way more expensive than the plastic container

    By on

    Tho I always purchase the syringes in the plastic containers with the disposal of used syringes on top ,for whatever reason it was unavailable.. I find that the box with the same amount of syringes ,in the box are way more expensive than the one in the plastic container... I didn't have a choice,my cat needed his syringes & I needed to purchase the boxes ones...

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  • 2 out of 5 stars


    By on

    Can someone tell me why this is so expensive? Other websites and my vet charge between $20 - $30 for the same thing

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  • 5 out of 5 stars

    Great for Pets

    By on

    These are the best syringes for giving our fur baby Diego his insulin shots twice a day. These work so easily and having them on auto ship insures I never run out. Thanks Chewy for another needed and helpful product and also your auto ship.

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