Adjusting Fludrocortisone Dose in Adult Adrenal Insufficiency

Introduction to Fludrocortisone Dosing

The Endocrine Society recommends that fludrocortisone dose should be adjusted based on serum electrolytes, blood pressure, and clinical symptoms, with most patients requiring 50-200 μg daily as a single morning dose, increasing when sodium is low or potassium is high, and decreasing when hypertension develops 1, 2

Most patients with primary adrenal insufficiency (PAI) should take 50-200 μg fludrocortisone as a single daily dose 2
Children and younger adults may require higher doses (up to 500 μg daily) 3
The dose should be taken in the morning upon awakening 3

Blood pressure in both supine and standing positions should be monitored 3
Clinical symptoms: salt cravings, lightheadedness, peripheral edema should be assessed 3

Orthostatic hypotension or persistent salt cravings despite adequate sodium intake may require an increase in fludrocortisone dose 3

Development of essential hypertension (dose should be reduced, but not stopped) 2, 4
Peripheral edema may require a decrease in fludrocortisone dose 3

Under-replacement with fludrocortisone is common and may predispose patients to recurrent adrenal crises 3
Patients should be advised to take salt and salty foods ad libitum 2
Avoid potassium-containing salt substitutes which are often marketed as "healthy" 3
Avoid liquorice and grapefruit juice as they potentiate the mineralocorticoid effect of hydrocortisone 2, 3

Diuretics, acetazolamide, carbenoxolone, and NSAIDs should be avoided as they interact with fludrocortisone 3
Drospirenone-containing contraceptives may require higher fludrocortisone doses 3
Pregnancy, particularly in the third trimester, may require increased fludrocortisone due to progesterone's anti-mineralocorticoid effects 4

Patients with PAI should be reviewed at least annually 2
Assessment should include measurement of weight, blood pressure, and serum electrolytes 2

Stopping fludrocortisone completely when hypertension develops (reduce dose instead) 2, 4
Failing to adjust fludrocortisone during pregnancy or periods of increased physical stress 4

Abrupt discontinuation of fludrocortisone can lead to adrenal crisis, characterized by hypotension, hyponatremia, hyperkalemia, and potentially life-threatening cardiovascular collapse, according to the Journal of Internal Medicine guidelines 5
Fludrocortisone should be tapered rather than abruptly discontinued to avoid adrenal crisis, with tapering occurring over at least 1-3 days when discontinuing mineralocorticoid replacement, as recommended by the Journal of Internal Medicine 5
Patients with primary adrenal insufficiency are at higher risk for severe consequences from abrupt discontinuation compared to those with secondary adrenal insufficiency, as stated in the Journal of Internal Medicine guidelines 5
If symptoms of adrenal insufficiency develop after discontinuation, prompt reinitiation of fludrocortisone is necessary, according to the Journal of Internal Medicine 5

Abrupt discontinuation of fludrocortisone can trigger an adrenal crisis, which is potentially life-threatening and requires immediate medical attention, characterized by hypotension, hyponatremia, hyperkalemia, and potentially life-threatening cardiovascular collapse 5
Fludrocortisone should be tapered rather than abruptly discontinued to prevent adrenal crisis, and patients should be under medical supervision during discontinuation to monitor for signs of adrenal insufficiency 5
Immediate administration of intravenous hydrocortisone is recommended for suspected adrenal crisis, along with rapid volume resuscitation with isotonic saline to correct hypotension and hyponatremia 5
Education about the risks of abrupt discontinuation is critical for all patients on fludrocortisone, and hospitalization may be required for severe cases 5

The American College of Cardiology notes that patients with heart failure require careful monitoring as both fludrocortisone therapy and its discontinuation can worsen their condition 6