ProZinc
Insulin therapy for diabetes mellitus in cats; sometimes used off-label in dogs. Active ingredient: insulin (protamine zinc recombinant human insulin).
Key takeaways
- ProZinc treats insulin therapy for diabetes mellitus in cats; sometimes used off-label in dogs
- Typical UK vet price £70 to £120 per month, based on observed dispensary list pricing across UK practices.
- Cheapest VMD-approved online from around £5.34 per month, versus £6.50 at the upper end of the same six pharmacies.
- Prescription works the same way, ask your vet for a written ProZinc prescription (capped at £21), dispense online.
- Main side effect to watch for: hypoglycaemia if overdosed, review the full list with your prescribing vet before starting or changing dose.
Live verified pricing
Just checkedLast refreshed 17 May 2026We checked the pharmacy product page directly. Prices below are the actual per-unit list price for the variant linked, confirm on the pharmacy site before buying.
- Pet Drugs OnlineProZinc U-40 Insulin Syringes 1ml Box of 120Visit pharmacy →£84.98per unit
See your saving over a year
Pick your dog's weight (and optionally your vet's actual quote) to see the exact monthly and annual saving. The price comparison table below sorts pharmacies by cheapest first; we never sort by commission.
Based on a 15 kg dog, recommended strength: 40 IU/ml. Assumes 12 months of continuous use (chronic dosing) and one written prescription per year. CMA Order caps the prescription fee at £21 for the first medicine, plus £12.50 per additional medicine on the same prescription. Prices are indicative and last verified 2026-05-15. Always confirm the current price on the pharmacy site before purchase.
Last refreshed: 17 May 2026. Always confirm the current price on the pharmacy site before purchase.
Why it costs more at the vet
Cold-chain veterinary insulin - high mark-up at practice level.
Common side effects
- Hypoglycaemia if overdosed
Not a complete list. Always read the patient information leaflet and speak to your vet about side effects.
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Copy-paste email template, prescription steps and refill setup. From "I just paid too much at the vet" to "I'm saving £X every month".
How to get a written prescription
The CMA Order is legally binding by 23 September 2026. Every UK vet must offer a written prescription on request, with the fee capped at £21 for the first medicine plus £12.5 per additional medicine on the same prescription. Take the prescription to any VMD-approved online pharmacy listed above.
Track ProZinc price drops
We'll email when ProZinc drops in price at any of the pharmacies above.
Stop overpaying for ProZinc.
Same medicine, same regulator, same vet relationship, half the price. Five-minute switch from in-clinic dispensing to a VMD-approved online pharmacy.
Pricing data status: indicative. Last verified 2026-05-15. Pharmacies change prices regularly, always confirm before purchase. Not medical advice.