Abstract
Technosphere® insulin uses a unique carrier -fumaryl diketopiperazine (FDKP)- which adsorbs insulin to form microparticles to permit delivery to the alveoli by inhalation. Toxicity studies have been entirely negative. The pulmonary absorption of insulin is very rapid, and the disappearance time is shorter than for subcutaneously delivered rapid-acting insulins. As a result, after inhalation, there is a rapid drop in glucose levels which subsequently return to normal in a shorter time than after subcutaneous insulin administration. Consequently, there is a lower incidence of hypoglycemic reactions. Pulmonary function studies have shown a small, reversible decrease in FEV1, and pulmonary imaging studies have shown no adverse effect. The inhalation of Technosphere insulin can produce a cough in up to 27% of patients. The cough has resulted in discontinuance in as many as 9% of users. Technosphere insulin has been approved for use in type 1 and type 2 diabetes. Long-term studies of pulmonary safety and surveillance for malignancy will be performed in the future. Studies to assess the optimal time dosing regimen are needed.
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