Open AccessThe incidence of diabetes is increasing world-wide. Many individuals with diabetes require insulin to control their blood sugar and prevent both microvascular and macrovascular complications associated with this chronic disease. Current regimens involve delivery of subcutaneous insulin by injection or continuous insulin infusion. One area of research to advance diabetes care is aimed at developing alternate routes of insulin administration that will make daily management less invasive for patients. This review will focus on inhaled insulin, a novel formulation which takes advantage of drug delivery through the pulmonary system. The pharmacology, efficacy, and safety of inhaled insulin will be discussed. In addition, the status of inhaled insulin as a potential therapy for individuals with diabetes will be reviewed.