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Our review confirm that tight glycaemia control with metformin monotherapy is one of the main therapeutic options for type 2 diabetes in patients with overweight or obesity, since it may prevent some events of macrovascular and microvascular complications, and mortality. With the exception of more benefit achieved in overweight and obese participants on metformin, there are not specific data across trials to perform subgroup analyses of patients with other cardiovascular risk factors, such as hyperlipidaemia, hypertension, impaired fibrinolysis, or older than 65, which could allow us to predict those who would benefit more from metformin monotherapy. There are not long term trials which compare more recent drugs, such as some sulphonylureas, thiazolidinediones, meglitinides, and alpha glucosidase inhibitors, with metformin for primary outcomes. Metformin produces strong beneficial changes in glycaemia control, and moderated in weight, lipids, insulinaemia and diastolic blood pressure. Sulphonylureas, alpha-glucosidase inhibitors, thiazolidinediones, meglitinides, insulin, and diet fail to show more benefit for glycaemia control, body weight, or lipids, than metformin. —Cochrane Review



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