Nonwarning hypoglycemia in drivers with diabetes.

Physicians are urged to identify the diabetic prone to nonwarning hypoglycemic reactions. Each patient's therapeutic regimen should be thoroughly reevaluated, and self-monitoring of the blood glucose should be instituted as a preventive measure. The inherent driving hazards of nonwarning hypoglycemia can be virtually eliminated by determining the glucose level just before driving and at one- to two-hour intervals on extended trips, and by maintaining the blood glucose at about 200 mg per dL.