HealthMap

Fludrocortisone and Aldosterone Replacement

• Primary role: Fludrocortisone acetate is a synthetic oral mineralocorticoid that is routinely prescribed to replace aldosterone in patients with Addison's disease (primary adrenal insufficiency).
• Mechanism of action: It acts on the distal tubules of the kidneys to promote sodium retention and potassium excretion, which is essential for maintaining normal blood volume, blood pressure, and electrolyte balance.
• Dosage considerations:
• The dosage must be carefully individualized based on blood pressure, serum electrolytes (sodium and potassium), and plasma renin activity.
• Inadequate replacement can lead to hyponatremia, hyperkalemia, and hypotension, while excessive doses can cause hypertension and edema.
• Hydrocortisone synergy: Fludrocortisone provides the necessary mineralocorticoid activity, but it is typically used in conjunction with a glucocorticoid (such as hydrocortisone) to fully replicate normal adrenal cortex hormone production.