Refrigerated items ship on a special schedule.

ProZinc (protamine zinc recombinant human insulin) U-40 Injectable for Dogs & Cats, 10-mL

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$125.11 Autoship Price
(-5%)
  • Keep saving 5% on every order
  • Never miss a dose with easy refills
  • Skip, change, or cancel anytime
$131.69 Chewy Price
($13.17 /mL)
Promo, Save 20% on first Rx order with code RX20
Promo, New Customers Only: Spend $49+, Get $20 eGift Card + Free Shipping with code: WELCOME

In Stock
FREE delivery
Usually arrives in 3-5 days
Prescription approval made easy
We’ll reach out to your vet clinic.

No interest if paid in full in 6 months on PayPal purchases of $149+. .

This item is specially packaged to remain refrigerated during transit.

About This Item

Details

ProZinc is a protamine zinc insulin prescribed by veterinarians to help support the insulin levels of diabetic cats and dogs. A single ProZinc injection has an appropriate duration of activity (10-14 hours) in cats and an extended duration of activity (16-24 hours) in dogs, which helps to keep their blood glucose level consistent throughout the day. It contains recombinant DNA that mimics human insulin, so it helps to control your pet's diabetic symptoms and keeps them comfortable.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.

Ingredients

Instructions

FAQ

Learn More About ProZinc From Our Team of Experts
4.8
Rated 4.8 out of 5 stars
1937 Ratings

Customers Mention

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

Ease of Use

92% Positive

Effectiveness

88% Positive

Ingredients

89% Positive

Long-Term Benefits

89% Positive

804 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 DogMum on Jan 24, 2026

Easy process

This was my first time ordering this here and I must say I am impressed. It shipped immediately after our vet approved the prescription. It was sent by overnight

This was my first time ordering this here and I must say I am impressed. It shipped immediately after our vet approved the prescription. It was sent by overnight delivery and packed in a nice large insulated box for protection and the ice pack was still frozen and insulin was nice and cold. Expires two years from now. And much more reasonable in price here. Thank you!!!


Rated 1 out of 5 stars
By Natasha on Jan 2, 2026

Delivery Nightmare

We have never had an issue with delivery until now. Only one ice pack and it was NOT delivered overnight. Ice pack was melted by the time it got here. Insulin is

We have never had an issue with delivery until now. Only one ice pack and it was NOT delivered overnight. Ice pack was melted by the time it got here. Insulin is slightly cool, but by no means as cold as it is when refrigerated properly. Not only dissatisfied, but a little concerned for my cat using this medicine.


Rated 5 out of 5 stars
By Susan on Jan 16, 2026

Shows great care for my cat's health!

The pharmacy tech called to tell me about a response given in error by my vet's office. I was able to get it corrected before it negatively affected my cat's health

The pharmacy tech called to tell me about a response given in error by my vet's office. I was able to get it corrected before it negatively affected my cat's health. Chewy's pharmacy is the best!


Rated 5 out of 5 stars
By Joyce on Dec 19, 2025

Customer care

Pharmacist reached out to my vet to get an emergency refill after chatting with them on the chat function. I'm really surprised at how good the follow through was

Pharmacist reached out to my vet to get an emergency refill after chatting with them on the chat function. I'm really surprised at how good the follow through was and how quickly it was done. Very appreciative. Thank you from me and my pet.


Rated 5 out of 5 stars
By Charles on Jan 26, 2026

Price

Our cat Winston is on insulin and over-the-counter products will not work for him. It was very hard to fine this product I'm so thankful you carry it.

Our cat Winston is on insulin and over-the-counter products will not work for him. It was very hard to fine this product I'm so thankful you carry it.


Rated 5 out of 5 stars
By Valentina on Oct 27, 2025

Great experience with chewy

It’s been stressful managing my cat’s diabetes, and this drug has managed it very well. But my review is more so about Chewy and their service. They do such a great

It’s been stressful managing my cat’s diabetes, and this drug has managed it very well. But my review is more so about Chewy and their service. They do such a great job and are so reliable. Their customer service reps are always super helpful. Chewy has made it so easy. They contact the vet on your behalf and everything, I don’t even have to do anything. And the insulin vial comes packaged SO extremely carefully, with a ton of ice packs as well. And it arrives to me very quickly. Chewy is such a trustworthy company, love them!


Rated 5 out of 5 stars
By Chris on Dec 18, 2025

Thanks for caring

I contacted Chewy regarding the passing of Mya. They, without asking, refunded me her most recent bottle of Prozinc 235.00. Then, a few days later, I received flowers

I contacted Chewy regarding the passing of Mya. They, without asking, refunded me her most recent bottle of Prozinc 235.00. Then, a few days later, I received flowers and a sympathy card. Thank You Chewy


Rated 3 out of 5 stars
By Kathleen on Oct 31, 2025

FedEx driver bad

The driver basically threw the box on my front porch and it flipped on its side. If I didn't have FedEx notification and a Yi camera to see it was delivered around

The driver basically threw the box on my front porch and it flipped on its side. If I didn't have FedEx notification and a Yi camera to see it was delivered around 12:15 and went home to refrigerate it,it might not have still been cold at 5:00 when I normally get home because the vial was outside of the cold packs due to the box being flipped. I have a video of the driver if you want it


Rated 1 out of 5 stars
By Elaine on Oct 9, 2025

Poor delivery

Chewy needs to know that the person who delivered this order just tossed it on the ground. This is insulin, packaged in a glass bottle, surrounded with frozen packets

Chewy needs to know that the person who delivered this order just tossed it on the ground. This is insulin, packaged in a glass bottle, surrounded with frozen packets. It could easily have been broken. I have Ring video in addition to these photos. He arrived in a personal vehicle, not a commercial truck.


Rated 5 out of 5 stars
By Keith on Oct 7, 2025

Expertly Mailed

Insulin needs to be kept cold at all times, but not frozen. Each shipment I have received was not only well protected from breakage, but was also insulted with Styrofoam

Insulin needs to be kept cold at all times, but not frozen. Each shipment I have received was not only well protected from breakage, but was also insulted with Styrofoam and five cold packs to keep the insulin cold, but not frozen in shipment. Shipping is fast. I forget at times to order till the last minute, I receive the package usually within two days of placing the order, if ordered weekdays. Highly recommend Chewy for this life saving medication for your pet. God Bless, Keith