Use code ONREPEAT at checkout for 65% off up to $65 on Auto-Refill Orders.

Use code DOGDAY40 at checkout for $40 off your next order over $100.*

*Coupon terms and conditions: code DOGDAY40 applicable for one-time or Subscribe & Save orders, for a limited time. Coupon codes apply to many, but not all, products. Excluded products include but are not limited to Azodyl, Bravecto, Bravecto Plus, Droncit, Incurin, Mometamax, Numelvi, Optimmune, Posatex, Sentinel, Tri-Heart Plus, VetPen, Vetsulin, compounded and refrigerated medications. Promotional code valid through August 23, 2026.

Use code DOGDAY60 at checkout for $60 off your next order over $200.*

*Coupon terms and conditions: code DOGDAY60 applicable for one-time or Subscribe & Save orders, for a limited time. Coupon codes apply to many, but not all, products. Excluded products include but are not limited to Azodyl, Bravecto, Bravecto Plus, Droncit, Incurin, Mometamax, Numelvi, Optimmune, Posatex, Sentinel, Tri-Heart Plus, VetPen, Vetsulin, compounded and refrigerated medications. Promotional code valid through August 23, 2026.

Now Available on Koala: Royal Canin Vet Fresh Frozen Diets! Use code FRESH50 at checkout for 50% off your first Subscribe & Save order.*

*Coupon terms and conditions: code FRESH50 applicable for first-time Subscribe & Save orders only. Coupon code applies to the following products: Royal Canin Appetite Stimulation Fresh Frozen Dog Food, Royal Canin Gastrointestinal Low Fat Fresh Frozen Dog Food, and Royal Canin Selected Protein Pork Recipe Fresh Frozen Dog Food. Promotional code valid through December 31, 2026.

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Buy diabetes medicine and insulin for cats. Trusted brands, vet-approved treatments, and fast delivery from Koala Health.

Buy Diabetes Medicine & Insulin for Cats

diabetes & insulin

Insulin Syringes/Needles U-100 are used for the injection of U-100 (100 units per ml) insulin in pets with diabetes. These syringes do not contain 1/2 unit markings.

UltiCare VetRx U-100 Syringes - 12.7mm x 29G

Insulin Syringes/Needles U-100 are used for the injection of U-100 (100 units per ml) insulin in pets with diabetes. These syringes contain 1/2 unit markings.

UltiCare VetRx U-100 Syringes with Half Unit Marks - 8mm x 31G

Insulin Syringes/Needles U-40 are used for the injection of U-40 (40 units per ml) insulin in pets with diabetes. These syringes do not contain 1/2 unit markings.

UltiCare VetRx U-40 Syringes & Sharps Container - 12.7mm x 29G

UltiCare VetRx U-40 Syringes - 12.7mm x 29G

Insulin Syringes/Needles U-40 are used for the injection of U-40 (40 units per ml) insulin in pets with diabetes. These syringes contain 1/2 unit markings.

UltiCare VetRx U-40 Syringes with Half Unit Marks & Sharps Container - 12.7mm x 29G

UltiCare VetRx U-40 Syringes with Half Unit Marks - 12.7mm x 29G

Vetsulin (porcine insulin zinc suspension) is the first and only FDA-approved insulin for the treatment of diabetes in dogs and cats.