Florinef Fludrocortisone Acetate Tablets

1. Indications and Usage
Adrenal Insufficiency (AI): Replacement therapy for primary and secondary adrenocortical insufficiency (e.g., Addison’s disease).
Congenital Adrenal Hyperplasia (CAH): Salt-wasting forms of congenital adrenal hyperplasia.
Orthostatic Hypotension: Occasionally used off-label for the treatment of severe orthostatic hypotension.
2. Dosage and Administration
Administration: Oral administration, usually taken in the morning.
Starting Dose:
Adults: Generally 0.1 mg once daily.
Children: Generally 0.05 to 0.1 mg once daily.
Titration: The dose is adjusted based on clinical response (blood pressure, electrolytes) and plasma renin activity.
Dietary Measures: Patients may require increased dietary sodium intake, especially during stress or diarrhea.
3. Mechanism of Action
Synthetic Mineralocorticoid: Fludrocortisone is a synthetic corticosteroid with potent mineralocorticoid activity and some glucocorticoid activity.
Renal Action: It acts on the renal distal tubules to increase sodium reabsorption and potassium/hydrogen excretion.
Physiological Effect: By retaining sodium and water, it helps restore blood pressure and extracellular fluid volume.
4. Safety and Warnings
Hypertension and Edema: Due to sodium retention, it can cause severe hypertension, edema, and congestive heart failure.
Hypokalemia: Can cause significant potassium loss leading to hypokalemia and alkalosis.
Adrenal Suppression: Abrupt withdrawal after prolonged use can lead to adrenal crisis (hypotension, shock).
Contraindications: Systemic fungal infections, known hypersensitivity, and uncontrolled hypertension.
5. Adverse Reactions
Most Common: Hypertension, headache, fluid retention (edema), hypokalemia, and weight gain.
Other: Acne, skin thinning, mood changes, and glucose intolerance (at higher doses).
6. Drug Interactions
Hypokalemia Risk: Concomitant use with amphotericin B, loop diuretics (e.g., furosemide), or thiazides increases the risk of hypokalemia.
Glucocorticoid Activity: Concomitant use with other steroids (e.g., prednisone) increases the risk of glucocorticoid side effects (e.g., peptic ulcers, hyperglycemia).
Metabolism Inducers: Rifampicin, phenytoin, or barbiturates may decrease serum levels.
7. Pharmaceutical Information
Chemical Name: 9α-Fluoro-11β,17α,21-trihydroxypregn-4-ene-3,20-dione 21-acetate.
Molecular Formula: C23H29FO6.
Storage: Store at 20°C to 25°C (68°F to 77°F). Protect from light and moisture.