Patients with chronic adrenal insufficiency need to adapt their hydrocortisone replacement
dose in conditions of physical or psychological stress to prevent life threatening adrenal
crisis. In cases of more severe impairment or unsecure gastrointestinal absorption (e.g.
gastroenteritis, severe infectious disease), parenteral administration of the hydrocortisone
dose is crucial. The study is conducted to offer patients the possibility to perform
hydrocortisone self administration in emergency situations in a way of administration which
is easy to perform and accepted by the patient. Therefore, pharmacokinetics and safety of
subcutaneous hydrocortisone administration will be studied and compared to intramuscular