Treatment Study in Patients Treated With Both Insulin & Hydrocortisone

Inclusion Criteria: Men and women at age 18 to 70 years, with BMI 18-32 kg/m2 and well-defined both insulin-treated diabetes \& Addison's disease for \>12 months each, on insulin treatment and stable hydrocortisone replacement with once-daily dual-release hydrocortisone (20-30 mg/day) for \>3 months. Exclusion Criteria: * Any medication with other glucose lowering agents than insulin * Any additional underlying or intercurrent disease that may need regular or periodic pharmacological treatment with glucocorticoids during the study period, including infectious diseases * Any medication with agents which in the investigator's judgement might interfere with the study drugs kinetics, including therapies affecting gastrointestinal emptying or motility * Any medication with oral estrogen supplementation and/or regular DHEA medication for the past 4 weeks * Clinically significant renal dysfunction with a serum creatinine above 160 mmol/L * Active malignancy * Clinical or laboratory signs of significant cerebral, cardiovascular, respiratory, hepatobiliary/pancreatic disease which in the investigator's judgement may interfere with the study assessment * Pregnant or lactating women * Alcohol/drug abuse or any other condition associated with poor patient compliance, including expected non-cooperation, as judged by the investigator.