Sulphonylureas, a type of drug widely used to treat type 2 diabetes, has a greater risk of causing heart failure and death as compared to metformin, another popular antidiabetes drug, according to a study.
The findings suggest that clinically important differences in the cardiovascular safety profiles of different antidiabetes drugs, and support recommendations that favour metformin as first-line therapy for type 2 diabetes.
Type 2 diabetes affects more than 180 million people worldwide and is associated with at least a two-fold increased risk of death, mainly from cardiovascular disease.
Oral antidiabetes drugs are widely used to help control blood sugar levels, but there are concerns that some may increase cardiovascular risk.
Thus, researchers led by Professor Paul Elliott from Imperial College London set out to investigate the risk of heart attack (myocardial infarction), congestive heart failure and death from any cause associated with prescription of different types of oral antidiabetes drugs.
They used data from 91,521 men and women (average age 65 years) with diabetes included in the UK General Practice Research Database between 1990 and 2005 and took into account factors that could potentially affect the results.
Metformin was the most commonly prescribed drug, followed by second generation sulphonylureas. Compared with metformin, both first and second generation sulphonylureas were linked with significant excess risk of all cause mortality, and second generation sulphonylureas with up to 30 percent excess risk of congestive heart failure.
Another class of antidiabetes drugs called thiazolidinediones were not associated with risk of heart attack, and there was significantly lower risk of all cause mortality associated with pioglitazone use compared with metformin.
"The sulphonylureas, along with metformin, have long been considered the mainstay of drug treatment for type 2 diabetes. Our findings suggest a relatively unfavourable risk profile of sulphonylureas compared with metformin," the British Medical Journal quoted the authors as saying.
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