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Abstract
Introduction: The first-choice drug therapy in the management of type 2 diabetes is metformin. However, most patients require a combined therapy to reach and/or maintain targets of glucose control. Dipeptidyl peptidase-4 (DPP-4) inhibitors, commonly referred to as gliptins, offer new options for combined therapy with metformin. Linagliptin is the most recently launched gliptin, with a unique pharmacokinetic (PK) profile characterized by negligible renal excretion and is now also available as a fixed-dose combination (FDC) with metformin.
Areas covered: An extensive literature search was performed to analyze the potential PK and pharmacodynamic interactions between linagliptin and metformin. Linagliptin and metformin may be administered together, either separately or as FDC supported by bioequivalence studies. Linagliptin and metformin are not prone to PK drug–drug interactions. Their coadministration improves blood glucose control more potently than either compound separately, without hypoglycemia and without increasing metformin-related gastrointestinal side effects.
Expert opinion: The combination linaglitpin plus metformin, if not contraindicated (renal failure), may be used as first-line or second-line therapy in the management of type 2 diabetes. That being said, the durability of the glucose-lowering effect of this combination needs to be further explored in long-term controlled trials.