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Diabetes 

Combining a GLP-1 receptor agonist plus insulin proves more effective than other diabetes therapies

A new study supports the use of GLP-1 agonists in combination with basal insulin in the management of patients with type 2 diabetes.

Patient measures his blood sugar levels with a blood glucose meter

Source: Ververidis Vasilis / Shutterstock.com

The meta-analysis included 15 studies that compared GLP-1 agonist and basal insulin combination therapy with other antidiabetic drugs in 4348 adults with type 2 diabetes

“A powerful and safer alternative to insulin” achieved robust glucose control for diabetes with no increased risk of hypoglycaemia or weight gain, conclude the authors of a systematic review of therapies published in The Lancet[1].

The combination of a glucagon-like peptide-1 receptor (GLP-1) agonist plus basal insulin offered the “ideal triumvirate”, according to Laura Young and John Buse from the University of North Carolina, USA, in an accompanying commentary to the meta-analysis[2].

The systematic review included 15 studies that compared GLP-1 agonist and basal insulin combination therapy with other antidiabetic drugs in 4,348 adults with type 2 diabetes.

The researchers, led by Ravi Retnakaran, from Mount Sinai Hospital, Toronto, Canada, noted that the high cost of both GLP-1 agonists and insulin analogues is likely to be the major barrier to widespread adoption of the treatment.

Combination therapy reduced glycated haemoglobin (HbA1c) by a mean of 0.44% more than other therapies and significantly improved the likelihood of achieving an HbA1c of 7.0% or lower, with a relative risk (RR) of 1.92. Furthermore, combination therapy was associated with a mean 3.22 kg reduction in body weight and did not increase the risk of hypoglycaemia (RR 0.99) versus other therapies.

Compared with full basal-bolus insulin regimens, the combination of GLP-1 agonist plus insulin resulted in a marginal 0.1% reduction in HbA1c, a 33% lower risk of hypoglycaemia and a mean 5.66-kg reduction in weight.

Retnakaran and colleagues say their data indicate that combining a GLP-1 agonist with basal insulin “can achieve the ideal triumvirate of short-term outcomes in diabetes management: potent glucose-lowering capacity without increased hypoglycaemia or weight gain”.

“Our findings clearly lend support to the use of GLP-1 agonists in combination with basal insulin in the clinical management of patients with type 2 diabetes.”

Victoria Ruszala, a diabetes pharmacist at North Bristol NHS Trust, said that the study provided reassurance about the co-prescription of GLP-1 agonists and basal insulin, already widely practised and endorsed by expert bodies such as the Association of British Clinical Diabetologists.

Ruszala added that while the meta-analysis summarised the overall benefits of combination therapy, there are likely to be differences in the efficacy and side-effects associated with individual GLP-1 agonists.

Citation: The Pharmaceutical Journal DOI: 10.1211/PJ.2014.20066519

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