During an Addisonian crisis, low blood pressure (BP), low blood glucose, and high levels of potassium can be life threatening. Standard therapy involves intravenous injections of glucocorticoids and large volumes of intravenous saline solution with dextrose, a type of sugar. This therapy usually brings rapid improvement. When the patient can take fluids and medications by mouth, the amount of glucocorticoids is decreased until a maintenance dose is reached. If aldosterone is deficient, maintenance therapy also includes oral doses of fludrocortisone acetate.
This answer is based on source information from the National Institute of Diabetes and Digestive and Kidney Diseases.