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Since the approval of sodium-glucose cotransporter 2 (SGLT2) inhibitors by the US Food and Drug Administration for type 2 diabetes, there have been several reports of euglycemic diabetic ketoacidosis in patients using this class of medication. We present a case of euglycemic diabetic ketoacidosis where ketonemia and glucosuria persisted well beyond the expected effect of dapagliflozin. Our patient is a 50-year-old woman with type 2 diabetes since age 35 who was taking metformin and dapagliflozin. She presented with fatigue, constipation, and 3 days of reduced oral intake. Laboratory data indicated anion gap acidosis, ketonemia, severe hypokalemia, and minimally elevated blood glucose. She was treated with sliding scale short-acting insulin and electrolyte replacement until hospital day 6, when endocrinology was consulted. An insulin drip was initiated due to persistent ketonemia and reopening of the anion gap, despite improved oral intake and normoglycemia. On stopping the insulin drip on day 9, the β-hydroxybutyrate increased again. It finally stabilized within normal range with the initiation of basal subcutaneous insulin. This case indicates that clinical effects of dapagliflozin persist much longer than the reported half-life of 12.9 hours would predict. To prevent this potentially dangerous complication, patients taking SGLT2 inhibitors who become ill should discontinue the medication, undergo ketone evaluation, and start basal insulin, if ketones are positive. In addition, patients should be educated to stop their SGLT2 inhibitor at least 1 week prior to elective procedures.

Prolonged Ketosis in a Patient With Euglycemic Diabetic Ketoacidosis Secondary to Dapagliflozin