<prompt> A patient with Addisons disease presented with adrenal crisis. Drug of choice is:HydrocoisoneBetamethasoneDexamethasonePrednisolone  <response>: Hydrocoisone, 100 mg intravenously every 8 hours, is the mainstay for treating adrenal insufficiency. Alternatively, dexamethasone, 0.1 mgkg every 8 hours, may be used without disruption of diagnostic testing. Once diagnostic testing has been done, hydrocoisone is the drug of choice because it has both glucocoicoid and mineralocoicoid functions. Once patients are stable, the dose may be tapered gradually over 1-2 weeks. Patients receiving less than 50 mgd of hydrocoisone will likely need mineralocoicoid suppo as well. Fludrocoisone, 0.05-0.2 mgd, is the drug of choice. Ref: Huecker M.R., Danzl D.F. 2011. Chapter 43. Metabolic Endocrine Emergencies. In R.L. Humphries, C. Stone Eds, CURRENT Diagnosis Treatment Emergency Medicine, 7e. 