Diabetic ketoacidosis (DKA) is a rare but serious risk of Jardiance and other SGLT2 inhibitors. What makes it distinctive is that it can occur at near-normal blood glucose — a phenomenon called euglycemic DKA. The overall risk in type 2 diabetes is low (less than 0.1 percent per year) but rises with specific triggers including illness, surgery, prolonged fasting, alcohol, very-low-carb diets, and rapid insulin reductions. Knowing the warning signs and prevention steps reduces risk substantially.
What DKA Is
Diabetic ketoacidosis is a metabolic emergency in which the body produces large amounts of ketones (acidic byproducts of fat breakdown) because of relative insulin insufficiency. The result is blood that becomes too acidic, dehydration, electrolyte abnormalities, and in severe cases, coma or death. Traditional DKA usually occurs at very high blood glucose (often above 300 mg/dL). Euglycemic DKA can occur at much lower glucose levels.
- Pathway — fat breakdown to ketone bodies (beta-hydroxybutyrate, acetoacetate, acetone)
- Blood pH typically below 7.3
- Bicarbonate typically below 18 mEq/L
- Anion gap elevated
- Blood beta-hydroxybutyrate elevated
- Urine ketones positive
- Glucose — high in classic DKA, normal or mildly elevated in euglycemic DKA
Why SGLT2 Inhibitors Can Cause Euglycemic DKA
The mechanism is a combination of glucose excretion, mild dehydration, and shifts in counter-regulatory hormones.
- SGLT2 inhibitors cause continuous glucose excretion in urine
- This relative glucose loss reduces insulin secretion need
- Lower endogenous insulin allows lipolysis and ketogenesis to increase
- Glucagon-to-insulin ratio rises, favoring ketone production
- The kidney also reabsorbs more ketones with SGLT2 inhibition, raising blood ketone levels
- Glucose can remain normal because urinary glucose loss continues
- Any insult (illness, fasting, low carb intake, reduced insulin) can tip the balance
Risk Factors
| Risk Factor | Why It Matters |
|---|---|
| Type 1 diabetes | Endogenous insulin already insufficient; SGLT2 inhibitors not approved |
| Insulin dose reduction at SGLT2i start | Removing too much insulin tips balance toward ketones |
| Acute illness with vomiting / fever | Stress hormones rise; oral intake falls |
| Surgery or anesthesia | Fasting plus stress response |
| Heavy alcohol use | Inhibits gluconeogenesis; promotes ketosis |
| Very-low-carb or ketogenic diet | Background ketosis stacks with drug effect |
| Prolonged fasting (over 24 hours) | Insulin secretion falls; ketones rise |
| Dehydration | Compounds metabolic stress |
| Latent autoimmune diabetes (LADA) | Lower endogenous insulin reserve than expected for T2D |
| Pancreatic insufficiency / post-pancreatectomy | Reduced insulin production |
Symptoms to Watch For
- Nausea and vomiting
- Abdominal pain
- Fast or deep breathing (Kussmaul respiration)
- Fruity or sweet breath odor
- Fatigue or weakness
- Confusion or trouble concentrating
- Excessive thirst even at normal glucose
- Dehydration signs — dry mouth, decreased urination
- Loss of appetite
- A glucose check that looks fine — do not be reassured by this alone
How to Check for Ketones
- Blood beta-hydroxybutyrate meter — most accurate, available OTC (Precision Xtra and others)
- Urine ketone strips — readily available, less accurate but useful
- Normal blood beta-hydroxybutyrate — under 0.6 mmol/L
- Mild ketosis — 0.6 to 1.5 mmol/L
- Significant — 1.5 to 3.0 mmol/L — seek medical evaluation
- DKA range — above 3.0 mmol/L — emergency care
Prevention Plan
- Hold Jardiance for acute illness with vomiting, fever, or inability to eat normally
- Hold 3 to 4 days before scheduled surgery; resume only when eating normally
- Avoid prolonged fasting (over 24 hours) while taking Jardiance
- Avoid very-low-carb diets (under 50 g per day) without medical guidance
- Limit alcohol consumption
- Check ketones if symptoms suggest DKA, even at normal glucose
- Continue insulin if also prescribed — never stop insulin abruptly
- Carry a medication list noting SGLT2 inhibitor use for any ER visit
- Tell anesthesia about Jardiance before any procedure
If You Suspect DKA
- Stop Jardiance immediately
- Check blood ketones if you have a meter
- Hydrate with water or sugar-free fluids if able to drink
- Contact your healthcare provider or go to urgent care / ER
- If severe symptoms (significant vomiting, breathing trouble, confusion) — call 911
- Bring your medication list including Jardiance
- Tell the clinician you are on an SGLT2 inhibitor — glucose may look normal but ketones must be checked
Treatment of Euglycemic DKA
Treatment in the hospital is similar to traditional DKA — IV fluids, IV insulin infusion (often with concurrent dextrose because glucose is not high), electrolyte replacement (especially potassium), and identification and treatment of the trigger. The acidosis usually resolves over 12 to 24 hours with appropriate care. Jardiance is held until full recovery and only restarted with clinician guidance after addressing the trigger.
Sick Day Rules on SGLT2 Inhibitors
| Situation | What to Do |
|---|---|
| Vomiting more than once | Hold Jardiance; check ketones; hydrate |
| Fever ≥ 38°C with poor intake | Hold Jardiance; sip fluids; contact clinician |
| Diarrhea with dehydration | Hold Jardiance; hydrate; check ketones if symptomatic |
| Major illness | Hold Jardiance until eating normally; clinician approval to resume |
| Surgery planned | Hold 3 to 4 days before; resume per surgical team |
| Starting ketogenic diet | Talk to clinician first; may need to switch off SGLT2i |
Why Risk Is Not a Reason to Avoid Jardiance for Most People
The absolute risk of DKA on Jardiance in type 2 diabetes is low — about 1 in 1,000 to 1 in 2,000 patients per year. The cardiovascular, heart failure, and kidney benefits are large and well-established. For most people, the benefits substantially outweigh the small DKA risk, particularly when sick-day rules are followed. The risk-benefit balance shifts in people with very low insulin reserve, repeated DKA episodes, or who plan to follow a strict ketogenic diet.
Related Reading
See our treatment hub, Is Jardiance for diabetes, and our diet and nutrition hub. For SGLT2 inhibitor safety details, see the FDA Drug Safety Communication on SGLT2 inhibitors.
The Bottom Line
Euglycemic diabetic ketoacidosis is a rare but serious risk of Jardiance. The overall risk in type 2 diabetes is less than 0.1 percent per year, but it rises with specific triggers — acute illness, surgery, fasting, very-low-carb diets, alcohol, and rapid insulin reductions. Warning symptoms include nausea, vomiting, abdominal pain, fast breathing, and fruity breath, even when blood glucose looks normal. Prevention is built around sick-day rules and pre-surgical holds. If symptoms occur, stop the drug, check ketones, and seek urgent medical evaluation. For most people, the benefits of Jardiance outweigh this rare risk when sick-day rules are followed. Talk to your doctor about your individual risks and how to handle illness or surgery safely.
