The first question almost every owner asks me after I say the words “your cat is diabetic” is some version of: do I really have to give injections twice a day for the rest of her life? Until a few years ago my answer was yes. Since late 2022 it has been sometimes no — and that change has been both a genuine gift and a source of some of the most preventable emergencies I see. Oral diabetes medication for cats works beautifully in the right patient and can kill the wrong one. Here is how I decide which cat is which.
\n\nWhat these drugs actually are
\nTwo oral products changed the conversation. Bexacat (bexagliflozin, tablets) received FDA approval in December 2022 as the first oral treatment for feline diabetes in the United States. Senvelgo (velagliflozin, an oral solution) followed in 2023. Both are given once daily, skip needles entirely, and need no refrigeration.
\nBoth belong to a drug class called SGLT2 inhibitors. They work in the kidney, not the pancreas: they block the transporter that normally reabsorbs glucose out of urine and back into the bloodstream. The result is that excess glucose is simply dumped into the urine. Blood sugar comes down without a drop of injected insulin.
\nThis works in cats because most diabetic cats have disease that behaves like human type 2 — insulin resistance plus a tired but still-functioning pancreas. Diabetic dogs are usually insulin-deficient and produce essentially none of their own, which is why there is no canine equivalent.
\n\nThe eligibility test I run before I prescribe
\nThis is the part that gets glossed over in marketing and in owner forums. These products are labelled for otherwise healthy diabetic cats that have not previously been treated with insulin. That is not a bureaucratic detail. A cat who has already needed insulin is often a cat whose pancreas is further along, and residual insulin production is exactly what keeps an SGLT2-treated cat out of ketoacidosis.
\n| Good candidate | Stay on insulin |
|---|---|
| Newly diagnosed, never had insulin | Currently or previously insulin-treated |
| Bright, eating well, stable weight | Anorexic, vomiting, dehydrated, or losing weight fast |
| No ketones on blood or urine testing | Any ketones, or a past episode of diabetic ketoacidosis |
| No significant concurrent illness | Suspected pancreatitis, significant liver disease, untreated hyperthyroidism |
| Owner can monitor and recheck on schedule | Cat needs rapid, tightly titrated glucose control now |
I also want an owner who will phone me the day the cat stops eating. These drugs demand a specific kind of vigilance in the first few weeks.
\n\nThe failure mode nobody explains well: euglycemic DKA
\nUnderstand why this happens and you will never be caught out by it. Ordinary DKA announces itself with a sky-high glucose reading. But these drugs keep pouring glucose into the urine regardless of what else is going wrong, so the number on your glucometer can sit in a comfortable range while the cat quietly burns fat and floods herself with ketones. Every instinct an owner has — her sugar is fine, so she must be fine — points the wrong direction.
\nSo I send these cats home with ketone testing, not just glucose testing. Urine ketone strips are cheap and adequate; blood ketone meters are better. Check ketones through the first couple of weeks and any time the cat seems off — and understand that appetite is the most important number in the house. A cat on an oral drug who skips two meals is an urgent call, not a wait-and-see.
\nOther adverse effects are less dramatic but real: soft stool, vomiting, reduced appetite, lethargy, weight loss. With sugar in the urine full-time I also watch for urinary tract infections, and the litter box stays wetter than a healthy cat's.
\n\nWhat you give up by going oral: the shot at remission
\nThis is the trade-off most sites skip. Feline diabetes is one of the few chronic diseases that can genuinely go into remission — the cat stops needing medication at all. The approach with the best remission record is a strict low-carbohydrate diet plus early, aggressive glycemic control with insulin. Published figures vary widely by protocol and timing, but remission in roughly a quarter to half of newly diagnosed cats is a realistic frame when treatment starts fast and is done well.
\nThe oral route is not a remission strategy. Cats started on an SGLT2 inhibitor generally stay on it. So when I have a newly diagnosed cat, a motivated owner, and a real window for remission, I still recommend insulin plus a low-carb canned diet, and I say so directly. When I have an owner who cannot or will not inject — and they exist, and they are not bad people — the oral drug is vastly better than the alternative, which is an untreated diabetic cat.
\n\nDiet does not change
\nWhichever drug you use, food does the heavy lifting. Diabetic cats belong on a low-carbohydrate, high-protein canned diet in measured meals, with a deliberate weight-loss plan if the cat is heavy. Obesity is the biggest driver of feline insulin resistance, and shedding it is the closest thing to a cure an owner can deliver at home. A once-daily tablet does not make the diet optional.
\n\nThe monitoring schedule I use
\n- \n
- Baseline: full bloodwork, urinalysis with culture if indicated, and ketones documented before the first dose. \n
- Week 1: owner checks appetite daily and ketones every few days. Any decline in appetite triggers a call. \n
- Weeks 2–4: recheck exam, glucose, and ketones in clinic. This is when problems surface. \n
- Ongoing: fructosamine to average glucose over weeks, plus renal values and weight every few months. A continuous glucose monitor on the shoulder beats stressful in-clinic curves, and I use them routinely. \n
My clinical bottom line
\nOral SGLT2 inhibitors are a real advance and I am glad to have them. But they are not the easy version of insulin — they are a different treatment with a narrower patient list and a failure mode that hides behind a normal glucose reading. If your cat is newly diagnosed and you can give injections, ask your vet about going hard for remission first. If injections are genuinely off the table, ask about oral therapy, learn to test ketones, and treat a lost appetite as the emergency it is.
\n\nFrequently asked questions
\nCan I switch my cat from insulin to a pill?
\nGenerally no, and this is the most common request I turn down. These drugs are labelled for cats not previously treated with insulin, and switching an insulin-dependent cat over raises the risk of ketoacidosis considerably. If you hate injecting, tell your vet — there is usually a technique problem we can fix instead.
\nDoes my cat still need special food on oral medication?
\nYes. Low-carbohydrate canned food and weight control matter just as much, arguably more, because you no longer have an adjustable insulin dose to compensate for a bad diet.
\nHow will I know it is working?
\nDrinking and urination should decrease, weight should stabilise, and your cat should act more like herself within a few weeks. Fructosamine and recheck glucose confirm it objectively.
\nVeterinary Disclaimer
\nContent reviewed by Dr. Sarah Mitchell for the SWT Pal Pet Veterinary Team. This article is educational and reflects general clinical experience; it is not a substitute for a hands-on examination by your own veterinarian, who knows your cat's history. Diabetes medication decisions, dosing and monitoring must be made with your own vet, and any diabetic cat who stops eating or becomes lethargic should be seen urgently.
\n\nSources & Further Reading
\nSWT Pal Pet researches each topic against recognized veterinary and breed authorities. The following organizations inform our content:
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