Aim: To compare the pharmacodynamic properties of different doses of regular human insulin administered in capsule form twice daily in a randomised twelve-week open-label study.Methods: A total of 100 individuals (48 males, 52 females) with type 2 diabetes on metformin completed the study according to the protocol. The mean (SD) age was 48.5 (6.7) years, body mass index 25.7 (2.8) kg/m 2 and HbA1c 8.10% (0.65%). Subjects randomized upon admission were assigned to one of three groups receiving formulated regular insulin at dose levels of 75 iu BD, 150 iu insulin BD, or 300 iu BD, all in enteric-coated capsules. The primary and secondary endpoints were change from baseline in HbA1c and fasting plasma glucose (FPG), respectively. Results:The study met its primary clinical endpoint of a decrease in HbA1c of 0.5% or higher (least square mean decrease 0.52%; P = .004, median decrease 0.6%) in the dose group receiving 150 iu BD. In a subset of this population, with starting HbA1c values of 9% to 9.5%, an average decrease of 1.575% was observed. In the total population, least square mean decreases in HbA1c for the 75 and 300 iu BD groups were À0.11% and À0.42%, respectively. Mean change in FPG in the 150 iu BD dose group was À18.8 mg/dl (P = .017) and À14.8 and À2.7 mg/dl for the 75 and 300 iu BD groups, respectively. A decrease of 20% for triglycerides (À40 mg/dl) was observed in the 150 iu BD dose group. No significant increases in body weight were observed, and significant decreases in systolic blood pressure were seen in all groups. No serious treatment-related adverse events were recorded, and no incidence of hypoglycaemia was reported throughout the entire 12-week study period.Conclusions: Capsulin oral insulin administered twice per day at a dose of 150 iu per capsule is safe, with no confirmed treatment-linked hypoglycaemic events, and results in significant decreases from baseline in HbA1c, FPG and triglycerides.

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