Safety wasmonitored by assessing patient reported symptoms,
changes in findings on physical examination, vital signs, laboratory
tests (complete blood count, blood urea nitrogen, serum
creatinine, and liver function test), and reports of hypoglycemia
during the study period. Hypoglycemia was defined by symptoms
associated with hypoglycemia or serum glucose level less than
60 mg/dL. Severe hypoglycemia was defined as having symptoms
that required assistance and associated with either a glucose level
less than 60 mg/dL or improved after receiving oral carbohydrate or
intravenous glucose. Patients recorded all adverse events in their
diary. If they had any abnormal events, they were instructed to
return to the clinic before the next appointment.