Fludrocortisone is a synthetic corticosteroid used to treat conditions caused by insufficient adrenal gland function, such as Addison's disease. It helps regulate sodium and potassium levels in the body, maintaining fluid balance and blood pressure. This medication is essential for patients with adrenal insufficiency, providing relief from symptoms like fatigue, low blood pressure, and electrolyte imbalances. Always follow your doctor's prescription for optimal results.