Hydrocortisone Management in Adrenal Insufficiency
For adult patients with adrenal insufficiency, use hydrocortisone 15-25 mg daily divided into 2-3 doses (highest dose in the morning), with fludrocortisone 50-100 μg daily for primary adrenal insufficiency; during surgery give hydrocortisone 100 mg IV at induction followed by 200 mg/24h continuous infusion, then double oral doses for 48 hours to one week postoperatively. 1, 2
Daily Maintenance Therapy
Glucocorticoid Replacement
Hydrocortisone is the preferred glucocorticoid for maintenance therapy 1:
- Dose: 15-25 mg daily in divided doses
- Timing:
- Two-dose regimen: Highest dose upon awakening, second dose in early afternoon (2 hours after lunch)
- Three-dose regimen: Morning (highest), lunch, and afternoon
- Alternative: Cortisone acetate 20-35 mg daily in divided doses
- Avoid dexamethasone: Risk of Cushingoid side effects due to difficulty with dose titration 1
Prednisolone 3-5 mg daily (once or twice daily) can be used as an alternative, particularly for patients with compliance issues 1. However, hydrocortisone remains the gold standard as it most closely mimics physiologic cortisol secretion.
Mineralocorticoid Replacement (Primary Adrenal Insufficiency Only)
All patients with primary adrenal insufficiency require fludrocortisone 1:
- Starting dose: 50-100 μg daily in adults
- Do not restrict salt intake
- Monitoring targets:
- Clinical: Absence of salt craving, postural hypotension, or edema
- Laboratory: Normal electrolytes, plasma renin activity in upper normal range 1
Recent evidence shows fludrocortisone dosing appears independent of glucocorticoid dose, and renin plus electrolytes are the most reliable indicators of adequate mineralocorticoid replacement 3, 4. Patients with low-normal renin may require higher fludrocortisone doses (around 86 μg vs 65 μg daily) 4.
Secondary adrenal insufficiency does not require fludrocortisone as aldosterone production remains intact 2.
Stress Dosing (Non-Surgical)
Patients must increase glucocorticoid doses during physiologic stress to prevent adrenal crisis. The general principle: double or triple the usual dose during febrile illness, significant infection, or other major stressors 1, 5.
Critical pitfall: Adrenal crisis occurs in 6-8 episodes per 100 patient-years, with mortality risk if not promptly treated 2. Patients must carry:
- Steroid emergency card
- Injectable glucocorticoid for emergency use
- Medical identification indicating steroid dependence 1
Surgical Stress Dosing
Major Surgery (General or Regional Anesthesia)
Intraoperative 2:
- Hydrocortisone 100 mg IV at induction
- Immediately start continuous infusion: 200 mg/24 hours
- Alternative: Hydrocortisone 50 mg IM every 6 hours
Postoperative 2:
- Continue hydrocortisone 200 mg/24h IV infusion while NPO or vomiting
- Once tolerating oral intake: Double usual hydrocortisone dose for 48 hours
- For major surgery: Continue doubled dose for up to one week before returning to maintenance
- If patient remains critically ill: Continue IV stress dosing until stable
Minor Procedures
With general anesthesia 2:
- Hydrocortisone 100 mg IV at induction
- Resume doubled oral doses for 24 hours once stable
Without general anesthesia 2:
- Double morning hydrocortisone dose pre-procedure
- Resume normal dosing afterward
Special Situations
Labor and vaginal delivery 2:
- Hydrocortisone 100 mg IV at onset of labor
- Start continuous infusion 200 mg/24h
- Alternative: 100 mg IM, then 50 mg IM every 6 hours
Cesarean section: Treat as major surgery 2
Bowel preparation: Requires clinical supervision with consideration of IV fluids and injectable glucocorticoid, especially for fludrocortisone-dependent patients 2
Monitoring and Dose Adjustment
Glucocorticoid Monitoring
Use clinical assessment only—not hormonal monitoring 1:
- Body weight
- Postural blood pressure
- Energy levels
- Signs of glucocorticoid excess (Cushingoid features)
Serum cortisol levels are unreliable for dose titration and should not guide therapy adjustments 1.
Mineralocorticoid Monitoring
Primary assessment 1:
- Clinical: Salt craving, postural hypotension, edema
- Laboratory: Serum sodium, potassium, plasma renin activity
Target renin in the upper normal range. Recent data confirms renin and electrolytes reliably indicate mineralocorticoid activity and should guide fludrocortisone dose adjustments 4.
Common Pitfalls and Caveats
Medication errors during hospitalization: 8.6% of patients report previous adrenal crisis from inadequate glucocorticoid dosing during hospital stays, including elective surgery 2. Ward staff may dismiss patient concerns about under-replacement symptoms—listen to experienced patients.
Relative adrenal insufficiency: Adrenal crisis symptoms can occur even with normal or elevated plasma cortisol in physiologically stressed patients 2. Do not withhold stress dosing based on cortisol levels alone in symptomatic patients.
Women may be overdosed initially: Real-world data shows primary adrenal insufficiency women often start on excessive glucocorticoid doses that can be successfully reduced over time 6.
Fludrocortisone can often be increased rather than increasing glucocorticoids: In primary adrenal insufficiency, optimizing fludrocortisone dose may prevent glucocorticoid over-treatment 6.
Patient education is paramount: Patients and their partners must understand stress dosing principles and when to self-administer emergency injectable hydrocortisone. This is the best strategy to prevent life-threatening adrenal crisis 5, 7.