Oral Diabetes Medications for Cats

By Dr Duncan Houston

A lot of cat owners ask the same thing after a diabetes diagnosis: do I really have to give injections, or is there a tablet or liquid instead? That is now a much more realistic question than it used to be. We finally have licensed oral options for some diabetic cats, but they are not suitable for every case, and choosing the wrong cat for them can go badly. (U.S. Food and Drug Administration)

The key clinical issue is not whether oral medication exists. It does. The real issue is whether your cat is a good candidate for it, whether ketoacidosis risk has been screened for properly, and whether insulin is still the safer choice. That is where proper veterinary judgement matters most. (U.S. Food and Drug Administration)

Quick Answer

Yes, some cats with newly diagnosed diabetes can be treated with oral medication instead of insulin, but only if they are carefully selected and closely monitored. The two modern oral drugs with the strongest evidence and current approval are the SGLT2 inhibitors bexagliflozin and velagliflozin. Insulin is still necessary for many cats, especially if they are unwell, losing weight, dehydrated, ketotic, previously treated with insulin, or showing signs of more severe disease. (U.S. Food and Drug Administration)

Are oral diabetes medications really an option for cats?

Sometimes, yes. Cats are not just small dogs when it comes to diabetes. In dogs, diabetes is usually insulin-dependent, so oral diabetic drugs are generally not useful. In cats, some cases behave more like type 2 diabetes in people, which is why non-insulin therapy can work in selected patients. (Merck Veterinary Manual)

That said, not every diabetic cat is a good oral-medication case. A newly diagnosed, otherwise stable cat is very different from a cat that is thin, dehydrated, lethargic, ketotic, or already insulin-dependent. Those details change everything. (U.S. Food and Drug Administration)

Which oral medications are the main options now?

The most important oral medications in current feline diabetes care are the SGLT2 inhibitors:

1. Bexagliflozin (Bexacat)

Bexacat is an FDA-approved once-daily flavored tablet for certain cats with diabetes mellitus. It lowers blood glucose by blocking renal glucose reabsorption, so more glucose is passed into the urine. It is intended for otherwise healthy cats with diabetes that have not previously been treated with insulin. (U.S. Food and Drug Administration)

2. Velagliflozin (Senvelgo)

Senvelgo is an FDA-approved once-daily oral liquid for certain diabetic cats. It works through the same SGLT2 mechanism, increasing urinary glucose loss to lower blood glucose. Like Bexacat, it is for carefully selected cats and requires screening and close follow-up. (U.S. Food and Drug Administration)

These two drugs are the modern oral options with the strongest evidence. A recent systematic review found that the newer SGLT2 inhibitors showed high treatment success and could perform similarly to insulin in selected cats, but they carry an important risk of euglycemic diabetic ketoacidosis, which is why monitoring is not optional. (PMC)

How do these newer oral drugs work?

Bexacat and Senvelgo are not insulin. They do not make the body use glucose in the same way insulin does. Instead, they work at the kidney level by blocking glucose reabsorption, so excess glucose is lost in the urine. (U.S. Food and Drug Administration)

That is why they can be very helpful in the right cat, but it is also why they are dangerous in the wrong cat. If a cat truly needs insulin and does not have enough insulin action in the body, simply spilling more glucose into the urine does not fix the underlying crisis. That is where ketoacidosis becomes the real concern. This last point is a clinical interpretation supported by the FDA contraindications and safety warnings. (U.S. Food and Drug Administration)

Which cats are good candidates for oral treatment?

In broad terms, the best candidates are:

• newly diagnosed cats

• otherwise stable cats

• cats not previously treated with insulin

• cats that are still eating and reasonably well hydrated

• cats without obvious ketoacidosis or major concurrent illness (U.S. Food and Drug Administration)

This is where owners often want a simple yes or no answer, but real life is messier. A cat that looks only mildly diabetic on paper but is already losing weight, becoming lethargic, or showing ketones is not the same as a bright cat whose diabetes was caught early. What matters most is whether the cat is stable enough for a non-insulin approach. (U.S. Food and Drug Administration)

Which cats should not be started on these oral drugs?

Bexacat and Senvelgo should not be used in cats that:

• have previously been treated with insulin

• are currently receiving insulin

• are insulin-dependent

• are lethargic, dehydrated, or not eating

• have diabetic ketoacidosis

• have important concurrent disease, especially involving the kidneys, liver, or pancreas (U.S. Food and Drug Administration)

That is one of the biggest practical takeaways here. Oral medication is not the “easy version” of diabetes treatment. It is a specific treatment for a specific subset of diabetic cats. (U.S. Food and Drug Administration)

What about glipizide?

Glipizide is an older oral diabetic medication that stimulates the pancreas to release insulin. It has been used in cats for years, but its performance is limited compared with modern options and insulin. Merck Veterinary Manual notes that short-term success occurs in about 50% of treated cats, while long-term success beyond a year is only around 15%. (Merck Veterinary Manual)

AAHA guidance is more cautious and recommends glipizide mainly for cats whose owners refuse insulin, and only with dietary therapy. It also notes concerns including vomiting, hypoglycemia, cholestasis, and possible contribution to progression of diabetes and pancreatic amyloidosis. (AAHA)

In practice, glipizide is not where most of the excitement is now. It still exists as an option, but it is usually a backup conversation, not the first one I would want to have when safer, better-defined modern options or insulin are on the table. That last sentence is my clinical judgement based on the current evidence and guideline direction. (Merck Veterinary Manual)

What about metformin and acarbose?

These are sometimes mentioned, but they are not the main story in feline diabetes.

Acarbose has been used in cats to reduce post-meal glucose absorption, generally alongside insulin and diet rather than as a sole treatment, and diarrhea is a recognized side effect. (Merck Veterinary Manual)

Metformin has historically had limited usefulness in cats with naturally occurring diabetes, and the stronger modern evidence now sits with SGLT2 inhibitors rather than metformin. A 2025 systematic review concluded that traditional oral agents such as glipizide, metformin, and acarbose had limited efficacy and weaker evidence than the newer SGLT2 drugs. (PMC)

Is insulin still the gold standard?

For many cats, yes.

Insulin plus diet remains a cornerstone of feline diabetes treatment, and many cats do very well with that approach. Merck Veterinary Manual also notes that when cats are treated with diet modification and insulin, many can go into diabetic remission and no longer need insulin. (Merck Veterinary Manual)

So while oral therapy is now a real option, it has not made insulin obsolete. The better question is not “Which is better in general?” but “Which is safer and more appropriate for this individual cat right now?” (U.S. Food and Drug Administration)

What role does diet play?

Diet matters a lot. In diabetic cats, a high-protein, low-carbohydrate diet is an important part of management, and canned food is often preferred over dry food. (Merck Veterinary Manual)

This is one of the biggest mistakes I see in diabetes discussions. People focus only on the drug and forget the metabolic environment around it. Medication matters, but so do food choice, weight trends, appetite, hydration, and the cat’s overall clinical stability. That clinical interpretation is consistent with current feline diabetes guidance. (Merck Veterinary Manual)

Severity framework: how worried should you be?

Low risk

Your cat has been newly diagnosed, is still eating, is hydrated, is not lethargic, and screening has not shown ketones or major concurrent disease.

What it usually means:

• oral therapy may be an option

• careful monitoring is still required

• this is the kind of case where a non-insulin plan may be reasonable (U.S. Food and Drug Administration)

Medium risk

Your cat has diabetes but is losing weight, showing inconsistent appetite, or not improving as expected.

What it may mean:

• the current plan may not be enough

• further testing, ketone checks, or a switch to insulin may be needed

• this is not a case to manage casually at home (U.S. Food and Drug Administration)

High risk

Your cat is lethargic, dehydrated, not eating, losing weight quickly, or has urinary ketones or suspected diabetic ketoacidosis.

What it may mean:

• oral medication may be inappropriate or dangerous

• insulin and more intensive treatment are likely needed

• this is urgent (U.S. Food and Drug Administration)

Critical

Your cat has diabetic ketoacidosis or euglycemic ketoacidosis.

What it means:

• this is a life-threatening emergency

• oral SGLT2 therapy should be stopped

• prompt insulin therapy, dextrose or another carbohydrate source, and nutritional support are required (U.S. Food and Drug Administration)

When is this an emergency?

Treat it as urgent if your diabetic cat has:

• sudden lethargy

• anorexia or marked drop in appetite

• dehydration

• weight loss

• vomiting

• weakness

• ketones in the urine

• signs of diabetic ketoacidosis, even if the blood glucose is not dramatically high (U.S. Food and Drug Administration)

That last point matters a lot. With SGLT2 inhibitors, cats can develop euglycemic diabetic ketoacidosis, where the blood glucose is not sky high even though the cat is in a serious metabolic crisis. That is one of the reasons these drugs need respect. (U.S. Food and Drug Administration)

What should you do next?

If your cat has just been diagnosed with diabetes, the practical next steps are:

First, make sure the cat is properly screened before starting oral treatment. That means assessing hydration, appetite, overall health, and checking blood and urine parameters to rule out cases where oral medication would be unsafe. (U.S. Food and Drug Administration)

Second, do not assume “needle-free” means lower-risk. Oral SGLT2 drugs can work very well, but the trade-off is the need for careful case selection and monitoring for ketoacidosis. (U.S. Food and Drug Administration)

Third, track the right things at home: appetite, water intake, urine output, body weight, energy, and any signs of nausea, lethargy, or dehydration. The FDA specifically recommends ongoing monitoring including blood glucose, fructosamine, urinary ketones, serum chemistry, body weight, hydration status, and clinical signs. (U.S. Food and Drug Administration)

Fourth, be ready to pivot. If your cat is not doing well on oral medication, insulin is not a failure. It is often the safer and more appropriate treatment. (U.S. Food and Drug Administration)

Common mistakes

One common mistake is assuming every diabetic cat is a candidate for an oral drug. They are not. Cats that are already sick, ketotic, dehydrated, or previously insulin-treated are the wrong cases for SGLT2 therapy. (U.S. Food and Drug Administration)

Another is focusing only on blood glucose and missing the bigger picture. Appetite, weight, hydration, ketones, and general clinical signs matter just as much, sometimes more. (U.S. Food and Drug Administration)

Another is seeing insulin as the “bad” option and oral medication as the “good” option. That is not how real case selection works. The right treatment is the one that fits the cat safely. This last line is clinical interpretation based on the evidence above. (U.S. Food and Drug Administration)

FAQ

Can cats be treated for diabetes without insulin?

Some can, especially newly diagnosed stable cats that are good candidates for Bexacat or Senvelgo, but many still need insulin. (U.S. Food and Drug Administration)

Are Bexacat and Senvelgo the same thing?

They are different drugs, but both are SGLT2 inhibitors approved in the US for certain diabetic cats and both lower blood glucose by increasing urinary glucose excretion. (U.S. Food and Drug Administration)

Is glipizide still used in cats?

Yes, but it is an older option with more limited long-term success and is generally not considered first-line over insulin and diet. (Merck Veterinary Manual)

Can diet alone help diabetic cats?

Diet is a major part of treatment, and a high-protein, low-carbohydrate approach is recommended in cats. Some cats treated with diet and insulin can achieve remission. (Merck Veterinary Manual)

When should I worry that oral treatment is not enough?

If your cat is losing weight, not eating well, becoming lethargic, dehydrated, developing ketones, or simply not improving, do not wait. That is the point where reassessment and often insulin become more important. (U.S. Food and Drug Administration)

Final thoughts

Oral diabetes medication for cats is no longer a fringe idea. It is a real and useful option in the right patient. But it is not a shortcut, and it is not safer just because it avoids needles. The newer SGLT2 drugs have changed the conversation, but they have also created a new one about careful screening, ongoing monitoring, and the risk of euglycemic ketoacidosis. (U.S. Food and Drug Administration)

The main decision point is simple: if your cat is stable, newly diagnosed, and carefully screened, oral treatment may be worth discussing. If your cat is unwell, ketotic, dehydrated, previously insulin-treated, or deteriorating, insulin is usually the safer road. That is the kind of call that should be made with real veterinary oversight, not guesswork. (U.S. Food and Drug Administration)

If you are unsure whether your cat is a safe candidate for oral diabetic treatment or whether insulin is the better option, ASK A VET™ can help you understand the red flags, the monitoring priorities, and what questions to ask your veterinarian next.