Steroid Coverage for Central Adrenal Insufficiency
For central adrenal insufficiency, use hydrocortisone 15-25 mg daily in divided doses (typically 2-3 times daily) for maintenance therapy, with stress-dose coverage of 50-100 mg IV/IM hydrocortisone during acute illness, surgery, or adrenal crisis. 1, 2
Maintenance Glucocorticoid Replacement
The physiologic replacement regimen should consist of:
- Hydrocortisone 15-25 mg total daily dose divided into 2-3 doses 1, 3
- Alternative: Prednisone 3-5 mg daily or cortisone acetate 4, 5
- No mineralocorticoid (fludrocortisone) is required in central adrenal insufficiency, unlike primary AI 4, 5
The lower end of this dosing range (15 mg) is increasingly favored to avoid glucocorticoid overtreatment and associated long-term complications 3. Doses should not be reduced below the physiologic replacement range, as this ensures adequate replacement while still providing stimulus for potential HPA-axis recovery 1.
Stress-Dose Coverage
For Acute Illness/Adrenal Crisis:
- Immediate: 50-100 mg hydrocortisone IV or IM 2
- Repeat as necessary
- Maintenance during crisis: 50-100 mg/m² per 24 hours IV, divided every 6 hours or as continuous infusion 2
For Surgery/Major Medical Stress:
Traditional high-dose, prolonged coverage regimens do not reflect physiologic cortisol responses and should be avoided 6. Instead:
- Use lower, more physiologic supplementation doses based on surgical stress level
- Duration should match the stress period, not extend unnecessarily 6
Key Clinical Pitfalls
Critical caveat: Patients with morning cortisol values near 300 nmol/L (10 μg/dL) may still have suboptimal cortisol response during major stress (sepsis, trauma, major surgery). Use clinical judgment and provide stress-dose coverage if adrenal insufficiency is suspected in these borderline cases 1.
Glucocorticoid withdrawal symptoms can mimic adrenal insufficiency but represent a distinct phenomenon, particularly in patients on long-term supraphysiologic doses. These patients may benefit from gradual tapering rather than abrupt discontinuation 1.
Monitoring HPA Axis Recovery
If assessing for HPA axis recovery (relevant for glucocorticoid-induced central AI):
- Morning serum cortisol >300 nmol/L (10 μg/dL): HPA axis recovered, can safely stop glucocorticoids 1
- 150-300 nmol/L (5-10 μg/dL): Continue physiologic replacement, retest in weeks to months 1
- <150 nmol/L (5 μg/dL): Continue physiologic replacement, retest after several months 1
Measure cortisol between 8:00-9:00 AM, holding glucocorticoid dose for at least 24 hours, only after reaching physiologic equivalent dosing 1.
Practical Considerations
Short-acting glucocorticoids (hydrocortisone or cortisone acetate) remain the gold standard because they better approximate physiologic cortisol patterns 2. Modified-release hydrocortisone formulations show promise for improving quality of life and metabolic outcomes, particularly for patients with poor control on conventional therapy 2, 4.
Patient education is essential: All patients must understand when and how to increase glucocorticoid doses during illness, and should carry emergency hydrocortisone for injection 2.