Replace extracellular fluid volume with 5% dextrose and 0.9% sodium chloride solution as prescribed. Monitor for electrolyte abnormalities; hyperkalemia is often present and may be treated with I.V. insulin and glucose to shift potassium into the cells. Administer I.V. hydrocortisone or dexamethasone, followed by continued use of hydrocortisone for long-term treatment, as prescribed.