Sulfonylureas as 2nd-Line T2DM Therapy Tied to Higher Event Risk

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Associated with increased risk of myocardial infarction, all-cause mortality, severe hypoglycemia.
Associated with increased risk of myocardial infarction, all-cause mortality, severe hypoglycemia.

(HealthDay News) -- Sulfonylureas as second-line drugs for type 2 diabetes are associated with an increased risk of cardiovascular and hypoglycemic events compared with remaining on metformin monotherapy or adding to metformin therapy, according to a study published online in The BMJ.

Antonios Douros, MD, PhD, from Jewish General Hospital in Montreal, and colleagues assessed whether adding or switching to sulfonylureas is associated with an increased risk of cardiovascular and hypoglycemic events. Patients adding or switching to sulfonylureas (25,699 subjects) were matched in a 1-to-1 ratio with those remaining on metformin monotherapy based on multiple factors, including hemoglobin A1c and number of previous metformin prescriptions.

The researchers found that over a mean follow-up of 1.1 years, sulfonylureas were associated with an increased risk of myocardial infarction (hazard ratio [HR], 1.26; 95% confidence interval [CI], 1.01 to 1.56), all-cause mortality (HR, 1.28; 95% CI, 1.15 to 1.44), and severe hypoglycemia (HR, 7.6; 95% CI, 4.64 to 12.44) vs continuing metformin monotherapy. Switching to sulfonylureas was associated with an increased risk of myocardial infarction (HR, 1.51; 95% CI, 1.03 to 2.24) and all-cause mortality (HR, 1.23; 95% CI, 1.0 to 1.5) compared with adding sulfonylureas. There were no differences observed for ischemic stroke, cardiovascular death, or severe hypoglycemia.

"Continuing metformin when introducing sulfonylureas appears to be safer than switching," the authors write.

One author disclosed ties to pharmaceutical companies including Boehringer Ingelheim, which provided funding for the study.

References

Sulfonylureas as second line drugs in type 2 diabetes and the risk of cardiovascular and hypoglycaemic events: population based cohort study. BMJ 2018;362. DOI:10.1136/bmj.k2693. [Published 18 July 2018]

Sulfonylureas as second line treatment for type 2 diabetes BMJ 2018;362. DOI:10.1136/bmj.k3041 [Published 18 July 2018]

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