Fludrocortisone (Florinef) Pharmacology

Fludrocortisone, a synthetic corticosteroid with potent mineralocorticoid activity, functions primarily by mimicking aldosterone to promote sodium reabsorption and potassium excretion. This mechanism effectively expands plasma volume, making the medication a standard treatment for orthostatic hypotension and adrenal insufficiency like Addison’s disease. Clinical management requires careful monitoring of blood pressure, electrolyte levels, and potential adverse effects such as edema, hyperglycemia, and immunosuppression. Because the drug can lower potassium levels, it poses specific risks when combined with diuretics or digoxin, potentially exacerbating toxicity. Furthermore, clinicians must account for its interaction with enzyme inducers and NSAIDs, which can alter drug metabolism or increase the risk of gastrointestinal bleeding. Dosing typically begins at 0.05 mg to 0.1 mg, with adjustments made based on blood pressure response and patient tolerance.