Published: 2016-12-28

Comparison of conventional and sustained-release formulation of metformin in type 2 diabetics

Vishal V. Ghorpade, Rajesh S. Hiray, Bharti R. Daswani, Balasaheb B. Ghongane


Background: To investigate the effects of metformin sustained-release (MSR) compared with metformin immediate-release (MIR) on glycaemic control, blood pressure, lipid profile and metabolic parameters like weight, waist circumference in type 2 diabetes.

Methods: A prospective, randomized, double blind study was conducted at tertiary healthcare and teaching hospital at Pune, Maharashtra. After obtaining institutional ethical committee approval and written informed consent, 40 newly diagnosed type 2 diabetic patient were randomly assigned to receive metformin immediate release formulation (MIR) 500 mg once 1 week and then twice daily and metformin sustained release formulation (MSR) 500 mg once 1 week and  then 1000mg once daily for 18 weeks. Fasting and post prandial blood glucose level (BGL), HbA1c, blood pressure, lipid profile, weight and waist circumference, were recorded at the start and end of study.

Results: Both MIR and MSR significantly decreased fasting; post prandial BGL and HbA1c at 18 weeks. But no significant difference was seen between two groups. Study did not show any effect on blood pressure and on lipid profile. Both formulations decreased obesity as evident by significant reduction in weight and waist circumference. All patients tolerated both formulations of metformin. Though overall incidences of adverse effects are less with sustained release formulation, difference was not significant between two groups.

Conclusions: To conclude, both metformin immediate release and sustained release formulations achieved comparable glycaemic control and sustained release formulation would be as effective as immediate release formulation with advantage of being reduce daily intake of tablets.


Metformin, Sustained release, Tolerability

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