Fludrocortisone is used in the treatment of Addison's Disease. Fludrocortisone requires a prescription from your veterinarian and is sold per tablet. Fludrocortisone acetate is a synthetic corticosteroid.Fludrocortisone acetate helps to regulate the concentration of sodium and potassium in the body with the help of mineralocorticoid. Give Fludrocortisone medication exactly as directed by your veterinarian.