Symptomatic Hypoglycemia in NIDDM Patients Treated With Oral Hypoglycemic Agents

We assessed the prevalence of hypoglycemic symptoms in patients (aged 40–65 yr) treated with oral hypoglycemic agents (OHAs) attending routine diabetes clinics at our hospital. Symptoms were experienced during the previous 6 mo in 41 of 203 (20.2%) patients treated with sulfonylureas but in none of the 16 patients treated with metformin alone. Hypoglycemic symptoms were experienced at least monthly in 5.9% and less frequently in 14.3% of patients. The prevalence of symptoms decreased with increasing duration of sulfonylurea administration (P < .01). Mean glycosylated hemoglobin and postprandial plasma glucose were significantly lower in patients reporting hypoglycemic symptoms than in those without symptoms (P < .001). The prevalence of hypoglycemic symptoms was significantly higher in patients treated with glyburide than in patients treated with gliclazide (P < .01) or chlorpropamide (P < .05). The prevalence of symptoms was higher in patients taking medications in addition to OHAs (P < .01). Ten (24%) of the patients who experienced hypoglycemic symptoms were taking drugs that may potentiate sulfonylureas.