Diabetes Care, Vol 19, Issue 3 252-254, Copyright © 1996 by American Diabetes Association
A comparison of acarbose versus metformin as an adjuvant therapy in sulfonylurea-treated NIDDM patients
M Bayraktar, DH Van Thiel and N Adalar
Department of Endocrinology, Hacettepe University, Ankara, Turkey.
OBJECTIVE: To compare the effects of acarbose or metformin treatment used
as an adjunct with a sulfonylurea agent in the treatment of NIDDM not
adequately controlled with the use of a sulfonylurea agent alone. RESEARCH
DESIGN AND METHODS: Of the poorly controlled female NIDDM patients on
sulfonylurea treatment, 18 were randomly selected from the outpatient
diabetic clinic for study. For 8 weeks, they received either acarbose (300
mg/daily) or metformin (1,500 mg/daily) in addition to sulfonylurea in a
crossover design using a 3-week washout period between treatments. The
efficacy of each drug regimen was assessed by measuring the levels of
glycosylated hemoglobin, fasting and 2-h postprandial blood glucose (PPBG)
levels, cholesterol, triglyceride, and fibrinogen levels before and after 8
weeks of therapy. RESULTS: The metabolic parameters measured before
initiation of either treatment regimen were similar. Mean fasting and 2-h
postprandial glucose levels were reduced moderately at the end of 8 weeks
of both combination treatments (P < 0.05). Although the fasting and 2-h
postprandial plasma insulin and C-peptide and fibrinogen levels at the end
of the 8-week treatment periods were lower than those obtained at the
beginning of the study, the differences between these values were not
statistically significant. Cholesterol levels remained unchanged. Only the
2-h PPBG level in the group using acarbose plus a sulfonylurea was lower
than the level achieved by the group using metformin plus a sulfonylurea
(8.1 +/- 0.8 vs. 9.8 +/- 1.0 mmol/l, respectively, P < 0.05). The
difference between pre- and posttreatment levels of the 2-h PPBG level in
both arms of the study were statistically significant (delta-acarbose, 5.3
+/- 0.4 vs. delta-metformin, 2.9 +/- 0.3) (P < 0.05). Specific
drug-associated side effects were observed in 12 patients on acarbose and 3
patients on metformin. CONCLUSIONS: Acarbose or metformin can be used as
effective adjuvant therapies with a sulfonylurea agent in NIDDM patients
who are poorly controlled with the sulfonylurea agent alone.