What are the recommended hydrocortisone doses for adults with adrenal insufficiency, stress situations, intravenous administration, topical use, and children?

Hydrocortisone Dosing in Adrenal Insufficiency

For adults with primary adrenal insufficiency, use hydrocortisone 15-25 mg/day divided into 2-3 doses with the highest dose in the morning; for secondary adrenal insufficiency, use a lower dose of 10-20 mg/day. 1

Daily Replacement Therapy

Adults

• Primary adrenal insufficiency (Addison's disease): 15-25 mg/day hydrocortisone 1
• Secondary adrenal insufficiency (ACTH deficiency): 10-20 mg/day hydrocortisone 1
• Dosing schedule: Split into 2-3 administrations daily, with the highest dose in the morning 1

The guideline emphasizes using the lowest tolerated replacement dose to avoid long-term complications of glucocorticoid excess 1. First-generation long-acting glucocorticoids (prednisolone, dexamethasone) should be avoided except when hydrocortisone pharmacokinetics prove inadequate 1.

Children

Dosing is weight-based using body surface area (mg/m²/day):

• Primary AI due to congenital adrenal hyperplasia: 10-18 mg/m²/day 1
  • Neonatal period: Higher doses of 20-40 mg/m²/day during the first month 1
• Other primary AI: 8-15 mg/m²/day 1
• Secondary AI (corticotroph deficiency): 8-10 mg/m²/day, with highest doses in infants before weaning 1
• Dosing schedule: 3 doses recommended for babies and young children; 2-3 doses for older children 1

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Adrenal Crisis Management

Adults

Immediate treatment with parenteral hydrocortisone hemisuccinate 100 mg IV or IM bolus, followed by continuous IV infusion of 100 mg/24 hours (or 25 mg IV/IM every 6 hours). 1

• Administer 1 liter isotonic saline in the first hour, adjusting based on hemodynamic monitoring 1
• Add 10% glucose if hypoglycemic 1
• Continue treatment for 24-48 hours 1
• When transitioning to oral therapy, triple the usual dose (minimum 60 mg/day) in three divided doses, then gradually taper over several days 1
• Resume fludrocortisone only when hydrocortisone dose drops below 50 mg/day in primary AI 1

Recent evidence from 2020 demonstrates that continuous IV infusion of 200 mg hydrocortisone over 24 hours, preceded by a 50-100 mg bolus, best maintains cortisol concentrations during major stress compared to intermittent bolus dosing 2. However, the French consensus guidelines recommend the more conservative 100 mg/24h regimen, which remains the standard of care.

Children

Hydrocortisone hemisuccinate 2 mg/kg every 6 hours by IV drip, or every 6-8 hours by IM or SC injection 1

• Parenteral rehydration: 5% or 10% glucose for hypoglycemia 1
• Sodium provision: 10-15 mEq/kg/day (maximum 408 mEq/day) 1
• Fluid requirements by age:
  • Newborn: 150-180 mL/kg/day
  • Child: 2.5-3 L/m²/day 1
• Volume resuscitation: 10-20 mL/kg isotonic saline bolus if circulatory collapse 1
• Monitor blood pressure, heart rate, glucose hourly, urine output, weight, and alertness 1

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Stress Dosing

Surgery - Adults

Major surgery: 100 mg hydrocortisone hemisuccinate IV/IM bolus, followed by continuous infusion 100 mg/24h (or 25 mg IV/IM every 6 hours) until oral intake resumes 1

• Upon resuming oral intake: triple normal dose (minimum 60 mg/day) in three divided doses, then gradually taper 1
• Resume fludrocortisone when hydrocortisone <50 mg/day 1

Surgery - Children

Same protocol as acute adrenal insufficiency (2 mg/kg/6h IV drip or 6-8h IM) until oral intake resumes 1

Minor surgery/light anesthesia: Hydrocortisone hemisuccinate 2 mg/kg every 4-6 hours IV or every 6-8 hours IM 1

Illness/Moderate Stress - Adults

During acute intercurrent illness requiring hospitalization: Hydrocortisone hemisuccinate 100 mg/24h continuous IV infusion (or 25 mg IV/IM every 6 hours) 1

For moderate stress not requiring hospitalization: Double to triple the oral dose until stress resolves 3, 4

COVID-19 infection with continuous high fever: 20 mg hydrocortisone orally every 6 hours 4

Illness - Children

Acute illness requiring parenteral therapy: 1-2 mg/kg every 6 hours IV drip or every 6-8 hours IM 1

After clinical improvement: triple normal oral dose in 3 divided doses, then gradually taper 1

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Labor and Delivery

Vaginal delivery: 100 mg hydrocortisone hemisuccinate IV at onset of labor, followed by continuous infusion 100 mg/24h (or 25 mg IV/IM every 6 hours) during labor 1

Cesarean section: Same as major surgery protocol - 100 mg bolus followed by 100 mg/24h infusion until oral intake resumes 1

After delivery without complications: triple normal oral dose in three divided doses, then gradually taper 1

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Topical Hydrocortisone

While topical corticosteroids can theoretically cause adrenal suppression, clinical reversible adrenal insufficiency is rare, and native adrenal supplementation during stress is generally unnecessary 5. Risk factors include high-potency formulations, occlusive dressings, prolonged use, thin-skinned areas, infants, and damaged skin barriers 5.

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Critical Pitfalls to Avoid

1. Never delay treatment waiting for cortisol assay results in suspected adrenal crisis 1
2. Do not restart fludrocortisone until hydrocortisone dose is <50 mg/day (high-dose hydrocortisone has mineralocorticoid activity) 1
3. Avoid abrupt cessation after long-term therapy; taper gradually 1
4. Monitor sodium carefully in children - should not increase >1 mEq/kg/hr 1
5. Patient education is essential - all patients should carry emergency hydrocortisone injection kits and steroid emergency cards 1, 4, 6, 7