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Fludrocortisone

Fludrocortisone: What You Need to Know

Fludrocortisone contains fludrocortisone acetate as its active component. It belongs to the hormone therapy class of medicines and is supplied as a pill in strengths of 100 µg. In the United Kingdom the drug is prescription-only and regulated by the Medicines and Healthcare products Regulatory Agency (MHRA).

How Fludrocortisone Works in the Body

Fludrocortisone is a synthetic mineralocorticoid that mimics the action of the natural hormone aldosterone. By binding to mineralocorticoid receptors in the distal tubules of the kidneys, it promotes:

• Reabsorption of sodium back into the bloodstream
• Excretion of potassium and hydrogen ions
• Retention of water, which helps maintain blood volume and blood pressure

These effects counteract the low-sodium, low-volume state that occurs in conditions such as primary adrenal insufficiency (Addison’s disease) and certain congenital adrenal hyperplasias.

Approved Medical Uses

In the UK, fludrocortisone is approved for:

• Replacement therapy in patients with adrenal insufficiency who lack adequate endogenous mineralocorticoid production.
• Management of salt-wasting congenital adrenal hyperplasia where glucocorticoid therapy alone does not correct sodium loss.

The drug is typically prescribed alongside glucocorticoids (e.g., hydrocortisone) to provide comprehensive adrenal hormone replacement.

Patient Suitability and Contraindications

Who Should Use Fludrocortisone?

• Adults with confirmed primary adrenal insufficiency or salt-wasting adrenal disorders.
• Patients who have stable renal function and normal serum potassium levels at the start of therapy.

Absolute Contraindications

• Known hypersensitivity to fludrocortisone acetate or any excipients.
• Severe hypertension (systolic > 180 mmHg or diastolic > 110 mmHg).
• Hypernatremia (serum sodium > 150 mmol/L).

Relative Contraindications

• Renal impairment (eGFR < 30 mL/min/1.73 m²) - dose may need reduction.
• Heart failure with fluid overload - close monitoring required.
• Pregnancy - use only if the potential benefit outweighs risks; animal data show no teratogenicity but human data are limited.
• Lactation - fludrocortisone is excreted in breast milk; consider alternative therapy if infant safety is a concern.

Safety Profile: Side Effects and Interactions

Common Side Effects

• Increased blood pressure - reported in > 1 % of patients.
• Edema (fluid retention) - often mild and resolves with dose adjustment.
• Headache - usually transient.
• Gastro-intestinal discomfort - nausea or abdominal cramping.

Serious Adverse Events

• Severe hypertension leading to target-organ damage.
• Electrolyte disturbances: marked hypokalemia or hypernatremia.
• Pulmonary edema in patients with underlying cardiac disease.

If any of these occur, seek medical attention promptly.

Drug Interactions

• Loop diuretics (e.g., furosemide) - increase sodium loss and may reduce fludrocortisone effectiveness.
• Potassium-sparing diuretics (e.g., spironolactone) - may blunt the potassium-lowering effect, increasing risk of hyperkalemia.
• ACE inhibitors and ARBs - can diminish the antihypertensive response and alter sodium balance.
• NSAIDs - may potentiate fluid retention and raise blood pressure.

Patients should provide a full medication list, including over-the-counter products and herbal supplements, before starting fludrocortisone.

Food and Lifestyle Interactions

• Salt intake - dietary sodium influences the required dose. Sudden changes in salt consumption should be discussed with a clinician.
• Alcohol - excessive intake can exacerbate fluid imbalance and should be limited.
• Driving - fludrocortisone does not impair cognition, but severe hypertension or electrolyte imbalance could affect alertness; monitor symptoms.

Dosing and Administration Guidelines

• Standard adult dosing for adrenal insufficiency is 100 µg once daily, taken in the morning.
• Some patients require dose titration between 50 µg and 200 µg daily based on blood pressure, serum electrolytes, and clinical response.
• Renal impairment may necessitate a lower starting dose (e.g., 50 µg) with careful monitoring.

Administration tips

• Swallow the pill whole with a glass of water.
• Take with food if gastrointestinal upset occurs.
• Do not split or crush the tablet unless the prescriber advises.

Missed dose

• If a dose is missed, take it as soon as remembered provided it is more than 6 hours before the next scheduled dose.
• Do not double the dose to compensate for a missed tablet.

Overdose

• Symptoms may include severe hypertension, profound fluid overload, and marked electrolyte disturbances.
• Seek emergency medical care; treatment focuses on blood-pressure control and correction of sodium/potassium imbalances.

Discontinuation

• Fludrocortisone should not be stopped abruptly in patients with adrenal insufficiency.
• A tapering plan, usually decreasing by 25 % every 2-3 weeks, helps prevent adrenal crisis.

Monitoring and Follow-Up

• Blood pressure - check at each clinic visit and more frequently after dose changes.
• Serum sodium and potassium - baseline, then 1-2 weeks after initiation and periodically thereafter.
• Renin activity (optional) - may be used to fine-tune the dose; elevated renin suggests under-replacement.

Patients should contact their healthcare provider if they experience dizziness, severe headache, swelling, or unexplained fatigue.

Storage and Handling

• Store at room temperature (15-25 °C), away from moisture and direct sunlight.
• Keep the bottle tightly closed and out of reach of children.
• Do not use the medication after the expiry date printed on the packaging.

Medication-Specific Glossary

Mineralocorticoid

A class of steroid hormones that regulate sodium and water balance by acting on kidney tubules.

Renin-angiotensin-aldosterone system (RAAS)

A hormonal cascade that controls blood pressure and fluid balance; fludrocortisone acts downstream of aldosterone.

Salt-wasting

Excessive loss of sodium in the urine, leading to low blood volume and hypotension; a key feature of some adrenal disorders.

Medical Disclaimer

This article provides educational information about fludrocortisone and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.