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A new drug could offer significant advantages over existing treatments for type 2 diabetes mellitus patients who don’t respond to Metformin. The new drug, Linagliptin ( Tradjenta, Trajenta ), results in significantly less weight gain than the most common second-line treatments currently used, and may even carry a smaller risk of cardiovascular events such as myocardial infarction and stroke.

Diabetes is estimated to have affected around 347 million people worldwide in 2008, almost 10% of the world’s population, and while Metformin is the most commonly prescribed initial drug treatment for the disease, it can become ineffective in the long-term for many patients.
There is currently a pronounced lack of evidence for which second-line drug treatments offer patients in this situation the best chances of recovering normal blood glucose levels.

Usually, patients who do not respond to Metformin alone are offered a class of drugs known as sulphonylureas in addition to their Metformin treatment. However, sulphonylureas, which work by stimulating the cells in the pancreas to make more insulin independently of blood glucose levels, can lead to hypoglycaemia and weight gain, which put patients at increased risk of myocardial infarction and stroke, as well as reducing their quality of life.

Since hypoglycaemia can have substantial negative clinical consequences in terms of cognitive function, mortality, morbidity, adherence to treatment, and quality of life, its prevention is a crucial component of any diabetes management programme.

The new drug, Linagliptin ( one of a class of drugs called DPP-4 inhibitors, or gliptins ), works in a different way to sulphonylureas, by blocking an enzyme known as dipeptidyl peptidase-4 which is involved in glucose metabolism. This allows the body to increase the amount of insulin it secretes in a glucose-dependent manner, resulting in a very low risk of hypoglycaemia.

The double-blind study, which took place over two years in sixteen different countries, examined the effects of Linagliptin versus Glimepiride ( Amaryl ), one of the most commonly used sulphonylureas, in more than 1,500 patients with type 2 diabetes mellitus who had not achieved normal glucose regulation through the use of Metformin alone.
While the two treatments produced comparable improvements in patients’ glucose regulation, the study showed that the side effects of Linagliptin appear to be considerably less severe than those attributed to Glimepiride, with just 7% of patients treated with Linagliptin experiencing hypoglycaemia, compared to 38% of patients treated with Glimepiride.
The group treated with Linagliptin also experienced fewer cardiovascular events such as heart attacks or strokes compared to those treated with Glimepiride, although the authors point out that further studies will be needed to confirm this, as the study was not long enough to provide reliable evidence that Linagliptin results in reduced cardiac risk compared to Glimepiride.

Source: The Lancet, 2012

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