The Ins and Outs of Glucocorticoid Replacement
Why is Glucocorticoid Replacement Important?
Patients with adrenal insufficiency, whether due to a pituitary problem or an adrenal problem, often require glucocorticoid replacement. Patients with adrenal causes—such as those who have undergone a bilateral adrenalectomy for Cushing’s disease—need both glucocorticoid (cortisol) and mineralocorticoid replacement (fludrocortisone).
Glucocorticoid replacement is usually given in the form of hydrocortisone (brand name Cortef). While prednisone or dexamethasone are options, hydrocortisone is generally recommended because its short half-life is more physiological.
The body produces most of its cortisol in the morning. Therefore, the proper way to replace it is to give the largest dose of hydrocortisone in the morning. While the body makes about 10-12 mg naturally, doses of 15 mg to 20 mg are typically needed due to absorption variables. A common replacement schedule might be 10 mg in the morning and 2.5 mg at lunch, dinner, and bedtime.
Hydrocortisone at Bedtime and Sleep Quality
While at the NIH, Dr. Friedman published a landmark paper on the timing of glucocorticoids for patients with Addison disease. The study found that a small dose of hydrocortisone at bedtime actually helped patients enter REM sleep.
While excess glucocorticoids can cause insomnia, glucocorticoid insufficiency is also associated with poor sleep quality. Consequently, Dr. Friedman recommends a low dose (2.5 mg) of hydrocortisone at bedtime for most patients on hormone replacement therapy.
When to Increase Your Hydrocortisone Dosage
Patients on lifelong replacement should maintain the lowest stable dose possible. However, “stress dosing” is necessary in specific scenarios:
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Illness: If you have a fever greater than 100.5°F or are experiencing nausea and vomiting, double your dose.
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Emergencies: If you cannot keep oral medication down (e.g., stomach flu or COVID-19), seek emergency care or use an IM injection of Solu-Cortef (100 mg).
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Stress/Exercise: Strenuous exercise or severe stress may warrant an extra 2.5 mg to 5 mg for a short period.
Protocol for Surgery
Common practice often over-replaces glucocorticoids during surgery. Based on NIH research, Dr. Friedman suggests:
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Major Surgery (e.g., Gallbladder removal): 100 mg IV hydrocortisone before surgery and 50 mg after.
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Minor Surgery: 100 mg before general anesthesia, followed by regular dosing.
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Colonoscopy: 50 mg IV hydrocortisone before the procedure and increased fluids.
Mineralocorticoid Replacement: Fludrocortisone
In addition to cortisol, patients with adrenal insufficiency need mineralocorticoid replacement via fludrocortisone (formerly Florinef).
This is monitored using a renin blood test:
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High Renin: Indicates a need for more fludrocortisone.
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Low Renin: Indicates a need for less fludrocortisone.
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Special Note: Double your fludrocortisone dose the day before a colonoscopy during the bowel prep phase.
Expert Guidance for Adrenal Health
Glucocorticoid replacement can be complex. If you have questions about managing adrenal insufficiency or want to schedule an appointment, please visit Dr. Friedman’s website at www.goodhormonehealth.com.