Repaglinide lowers blood glucose by stimulating the release of insulin from the pancreas. It achieves this by closing ATP-dependent potassium channels in the membrane of the beta cells. This depolarizes the beta cells, opening the cells' calcium channels, and the resulting calcium influx induces insulin secretion. Repaglinide is a major substrate of CYP3A4 and should not be administered concomitantly with gemfibrozil, clarithromycin or azole antifungals such as itraconazole or ketoconazole[citation needed]. Administration of both repaglinide and one or more of these drugs results in an increase in plasma concentration of repaglinide and may lead to hypoglycemia. Repaglinide is an oral medication for lowering blood sugar (glucose) in individuals with diabetes. It is in a class of drugs for treating diabetes type 2 called meglitinides that are chemically unlike other anti-diabetic medications.