Glycemic control in patients with type 2 diabetes mellitus switched from twice-daily immediate-release metformin to a once-daily extended-release formulation.
BACKGROUND
The extended-release formulation of metformin (MXR) prolongs drug absorption in the upper gastrointestinal tract and permits once-daily dosing in patients with type 2 diabetes mellitus. This newer formulation may enhance patient compliance with oral therapy and improve long-term control of diabetes compared with the conventional immediate-release formulation of metformin (MIR).


OBJECTIVE
The goal of this study was to determine the effects on glycemic control of a switch to MXR therapy in patients with type 2 diabetes currently treated with MIR.


METHODS
This was a multicenter, randomized, double-blind, parallel-group study in patients with established type 2 diabetes. Eligible patients were to have a glycated hemoglobin (HbA1c) value < or = 8.5% and mean fasting plasma glucose (FPG) concentrations < or = 200 mg/dL while receiving MIR 500 mg BID for at least 8 weeks. After a 2-week, single-blind lead-in period, patients were randomly assigned to receive MXR 1000 or 1500 mg QD for 24 weeks or to continue MIR 500 mg BID for 24 weeks. The primary efficacy variable was change in HbA1c from baseline to week 12. Other variables included change in FPG levels; change in HbA1c; distribution of HbA1c values; mean daily blood glucose concentrations (self-monitored); levels of fructosamine, serum insulin, and lipids; and body weight.


RESULTS
Two hundred seventeen patients were randomized to treatment. The mean change from baseline in HbA1c values at weeks 12 and 24 were small and similar in the 3 treatment groups. At week 12, the mean change from baseline in HbA1c was 0.15% for MIR, 0.23% for MXR 1000 mg, and 0.04% for MXR 1500 mg. The corresponding mean changes at week 24 were 0.06%, 0.25%, and 0.14%.


CONCLUSIONS
In this study, patients with type 2 diabetes who had been receiving twice-daily MIR achieved comparable glycemic control when therapy was switched to once-daily MXR at the same or a greater total daily dose.
Fujioka
Ken
K
Nutrition and Metabolic Research Center, Scripps Clinic Del Mar, San Diego, California 92310, USA. kfujioka@scrippsclinic.com
Pans
Miranda
M
Joyal
Steven
S
D001786:Blood Glucose / Q000032:analysis*; D003692:Delayed-Action Preparations; D003924:Diabetes Mellitus, Type 2 / Q000097:blood* / Q000188:drug therapy*; D004311:Double-Blind Method; D004334:Drug Administration Schedule; D005260:Female; D006442:Glycated Hemoglobin / Q000032:analysis; D006801:Humans; D007004:Hypoglycemic Agents / Q000008:administration & dosage* / Q000627:therapeutic use; D008297:Male; D008687:Metformin / Q000008:administration & dosage* / Q000627:therapeutic use; D008875:Middle Aged; D010349:Patient Compliance; D016896:Treatment Outcome
D001786:Blood Glucose; D003692:Delayed-Action Preparations; D006442:Glycated Hemoglobin; D007004:Hypoglycemic Agents; D008687:Metformin