Switching basal insulins in type 2 diabetes: practical recommendations for health care providers.

Basal insulin remains the mainstay of treatment of type 2 diabetes when diet changes and exercise in combination with oral drugs and other injectable agents are not sufficient to control hyperglycemia. Insulin therapy should be individualized, and several factors influence the choice of basal insulin; these include pharmacological properties, patient preferences, and lifestyle, as well as health insurance plan formularies. The recent availability of basal insulin formulations with longer durations of action has provided further dosing flexibility; however, patients may need to switch agents throughout therapy for a variety of personal, clinical, or economic reasons. Although a unit-to-unit switching approach is usually recommended, this conversion strategy may not be appropriate for all patients and types of insulin. Glycemic control and risk of hypoglycemia must be closely monitored by health care providers during the switching process. In addition, individual changes in care and formulary coverage need to be adequately addressed in order to enable a smooth transition with optimal outcomes.