Glycemic control with glyburide/metformin tablets in combination with rosiglitazone in patients with type 2 diabetes: a randomized, double-blind trial

Am J Med. 2004 Feb 15;116(4):223-9. doi: 10.1016/j.amjmed.2003.07.022.


Purpose: To assess the efficacy and safety of adding rosiglitazone to an established regimen of glyburide/metformin in patients with type 2 diabetes who had not achieved adequate glycemic control (glycosylated hemoglobin [HbA1C] levels >7.0% and < or =10.0%).

Methods: Following an open-label, lead-in phase to optimize the dosing of glyburide/metformin tablets, 365 patients randomly received additive therapy comprising rosiglitazone (4 mg once daily) or placebo for 24 weeks. Based on glycemic response, rosiglitazone dose was maintained or increased to 4 mg twice daily. Glyburide/metformin dose was maintained or reduced by 2.5/500 mg for symptomatic hypoglycemia. The primary endpoint was the change in HbA1C level from baseline to week 24. The proportions of patients achieving HbA1C levels <7% and a fasting plasma glucose level <126 mg/dL were also assessed.

Results: After 24 weeks, therapy with glyburide/metformin plus rosiglitazone resulted in a greater reduction in HbA1C levels (-1.0%, P<0.001) compared with combination therapy that included placebo, and in a larger proportion of patients (42% vs. 14%) who attained levels <7%. The difference in fasting plasma glucose levels between groups was -48 mg/dL (P<0.001), favoring glyburide/metformin plus rosiglitazone. The adverse event profile in the rosiglitazone-treated group included mild-to-moderate edema (8%), hypoglycemia (22%), and weight gain of 3 kg. No patient experienced hypoglycemia requiring third-party assistance.

Conclusion: In patients with inadequate glycemic control despite established glyburide/metformin therapy, the addition of rosiglitazone improves glycemic control, allowing more patients to achieve an HbA1C level <7% and perhaps delaying the need for insulin treatment.

Publication types

  • Clinical Trial
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Diabetes Mellitus, Type 2 / drug therapy*
  • Double-Blind Method
  • Drug Therapy, Combination
  • Female
  • Glyburide / administration & dosage
  • Glyburide / therapeutic use*
  • Glycated Hemoglobin A / drug effects
  • Humans
  • Hypoglycemic Agents / administration & dosage
  • Hypoglycemic Agents / adverse effects
  • Hypoglycemic Agents / therapeutic use*
  • Male
  • Metformin / administration & dosage
  • Metformin / therapeutic use*
  • Middle Aged
  • Rosiglitazone
  • Thiazolidinediones / administration & dosage
  • Thiazolidinediones / adverse effects
  • Thiazolidinediones / therapeutic use*


  • Glucovance
  • Glycated Hemoglobin A
  • Hypoglycemic Agents
  • Thiazolidinediones
  • Rosiglitazone
  • Metformin
  • Glyburide