DIAZOXIDE, a nondiuretic thiazide, when injected intravenously (IV) is a potent arteriolar dilator effective in the treatment of severe hypertension associated with pregnancy.<sup>1,2</sup>Animal studies have shown that diazoxide crosses the placenta, causing fetal hyperglycemia<sup>3,4</sup>and destruction of pancreatic islet cells.<sup>5</sup>An infant experienced severe persistent postnatal hyperglycemia after in utero exposure to diazoxide. <h3>Report of a Case</h3> A 31-year-old woman, gravida 1, para 0, noted to have proteinuria (2+) and blood pressure (BP) of 130/90 mm Hg at approximately 30 weeks' gestation, was hospitalized at 33 weeks with complaints of abdominal pain. A BP of 200/130 mm Hg, with 3+ reflexes, ankle edema, and proteinuria (3+) were present. Mild uterine contractions ensued, with BP to 240/140 mm Hg. The mother was initially treated with intramuscular magnesium sulfate and hydralazine hydrochloride, with reduction in BP to 194/130 mm Hg. Approximately 2 1/2 hours before delivery, furosemide, 40