Diabetes Care, Vol 17, Issue 1 45-49, Copyright © 1994 by American Diabetes Association
Long-term randomized placebo-controlled double-blind therapeutic comparison of glipizide and glyburide. Glycemic control and insulin secretion during 15 months
KI Birkeland, K Furuseth, A Melander, P Mowinckel and S Vaaler
Hormone Laboratory, Aker Hospital, Oslo, Norway.
OBJECTIVE--To examine the long-term (15 months) effects on glycemic control
and insulin secretion of glipizide and glyburide treatment in patients with
non-insulin-dependent diabetes mellitus (NIDDM). RESEARCH DESIGN AND
METHODS--Prospective, randomized, double-blind, placebo-controlled study on
46 NIDDM patients comparing fasting levels and test-meal responses of
glucose and insulin during 15 months of follow-up. RESULTS--A comparable
reduction in HbA1c levels by both agents versus placebo was observed
throughout the study period, but after a marked initial reduction in both
sulfonylurea groups, all three groups showed gradually increasing HbA1c
levels. However, both glipizide and glyburide achieved and maintained
lowered postprandial glucose levels and increased fasting and postprandial
insulin levels compared with placebo. CONCLUSIONS--Both glipizide and
glyburide may achieve and maintain glycemic reduction and stimulation of
insulin secretion during long-term treatment. However, these agents do not
prevent the gradual increase in overall glycemia that develops over time in
NIDDM patients.