What are the recommended dosing regimens and precautions for using hydrocortisone topically for inflammatory skin conditions and orally for adrenal insufficiency?

Hydrocortisone Dosing and Management

For adrenal insufficiency, hydrocortisone is the first-line glucocorticoid with oral dosing of 15-25 mg/day in adults (divided 2-3 times daily, highest dose in morning) and 8-15 mg/m²/day in children; during acute adrenal crisis, immediately administer 100 mg IV/IM hydrocortisone hemisuccinate followed by continuous infusion of 100 mg/24h in adults or 2 mg/kg every 6-8 hours in children. 1

Chronic Oral Replacement Therapy

Adults

• Primary adrenal insufficiency (Addison's disease): 15-25 mg/day hydrocortisone 1
• Secondary adrenal insufficiency (ACTH deficiency): 10-20 mg/day (lower dose than primary) 1
• Dosing schedule: Split into 2-3 doses daily, with the highest dose in the morning to mimic physiological cortisol rhythm 1
• Avoid long-acting glucocorticoids (prednisolone, dexamethasone) as first-line except when hydrocortisone pharmacokinetics are inadequate 1

Children

• Primary AI (non-CAH): 8-15 mg/m²/day divided into 3-4 doses 1
• Congenital adrenal hyperplasia (CAH): 10-18 mg/m²/day (higher doses needed for androgen suppression) 1
  • Neonatal period: 20-40 mg/m²/day during first month 1
• Secondary AI: 8-10 mg/m²/day (lower than primary) 1
• Three doses per day recommended in babies and young children 1

Mineralocorticoid Replacement (Primary AI Only)

• Fludrocortisone 50-100 μg/day in adults (mean 100 μg/day, individually adjusted) 1
• Children: 50-100 μg/day plus oral sodium supplementation (1-2 g/day) until age 1-2 years 1
• Do not use in secondary AI (ACTH deficiency alone) 1

Acute Adrenal Crisis Management

Adults

• Immediate treatment: 100 mg hydrocortisone hemisuccinate IV or IM bolus 1
• Continuous therapy: 100 mg/24h by continuous IV infusion OR 25 mg IV/IM every 6 hours 1
• Fluid resuscitation: 1 liter isotonic saline in first hour, adjust based on hemodynamics 1
• Transition to oral: Once stable, triple normal dose (minimum 60 mg/day) in 3 divided doses, then gradually taper over several days 1
• Fludrocortisone: Resume only when hydrocortisone dose <50 mg/day in primary AI 1

Children

• Hydrocortisone hemisuccinate: 2 mg/kg every 6-8 hours IM/SC or every 6 hours IV 1
• Fluid management:
  • 5-10% glucose for hypoglycemia
  • NaCl 10-15 mEq/kg/day (max 408 mEq/day)
  • Newborns: 150-180 mL/kg/day; Children: 2.5-3 L/m²/day 1
  • Isotonic saline bolus 10-20 mL/kg for circulatory collapse 1
• Transition: Triple normal oral dose in 3 divided doses, gradually reduce over days 1

Stress Dosing Protocols

Major Surgery (Adults)

• Induction: 100 mg hydrocortisone hemisuccinate IV/IM bolus 1, 2
• Intraoperative: Continuous infusion 100 mg/24h (or 25 mg IV/IM every 6h) until oral intake resumes 1, 2
• Postoperative: Triple normal dose (≥60 mg/day) in 3 doses for 48 hours, then gradual taper over days to week 1, 2
• UK guidelines recommend higher doses: 200 mg/24h continuous infusion intraoperatively and postoperatively 2

Major Surgery (Children)

• Induction: 2 mg/kg hydrocortisone IV/IM 1, 2
• Continuous infusion based on weight: 2
  • Up to 10 kg: 25 mg/24h
  • 11-20 kg: 50 mg/24h

  • 20 kg prepubertal: 100 mg/24h

  • Pubertal: 150 mg/24h
• Postoperative: 2 mg/kg every 4 hours IV/IM, then double oral doses for 48 hours 1, 2

Minor Procedures

• Adults: 100 mg hydrocortisone IV/IM at procedure start 2
• Children: 2 mg/kg IV/IM at induction, then double oral doses for 24 hours 2

Labor and Delivery

• Vaginal delivery: 100 mg/24h continuous infusion (or 25 mg IM/IV every 6h) during labor 1, 2
• Cesarean section: Same as major surgery protocol 1, 2
• Post-delivery: Triple normal dose for 48 hours if uncomplicated, then gradual taper 1

Acute Intercurrent Illness

• Adults: 100 mg/24h continuous IV infusion (or 25 mg IV/IM every 6h) until stable, then triple oral dose (≥60 mg/day) with gradual taper 1
• Children: 1-2 mg/kg every 6 hours IV or every 6-8 hours IM, then triple oral dose with gradual taper 1

Colonoscopy (Adults)

• Preparation: 20 mg hydrocortisone extra dose evening before AND morning of exam 1
• Procedure: 100 mg hydrocortisone hemisuccinate IM/IV immediately prior 1
• Post-procedure: Resume normal dose next day 1
• If crisis signs during prep (fatigue, nausea, hypotension): 100 mg IM/SC immediately 1

Critical Precautions and Patient Education

Emergency Preparedness

All patients must: 1

• Carry medical alert card/bracelet identifying adrenal insufficiency
• Have 100 mg hydrocortisone hemisuccinate vials, syringes, and needles at all times
• Be trained in subcutaneous self-injection technique
• Know how to triple oral doses during illness/stress
• Recognize early crisis signs (severe fatigue, nausea, hypotension, confusion)

Common Pitfalls to Avoid

1. Never delay treatment waiting for cortisol/ACTH results if crisis suspected 1
2. Do not restart fludrocortisone until hydrocortisone <50 mg/day (high-dose hydrocortisone has mineralocorticoid activity) 1
3. Avoid long-acting synthetic glucocorticoids (prednisolone, dexamethasone) in children except specialist advice 1
4. Monitor for chronic overdosing which increases cardiovascular, metabolic, and bone complications 1, 3
5. Glucocorticoid-induced AI risk: Any dose >15-25 mg hydrocortisone equivalent (>4-6 mg prednisone) for >3-4 weeks 4

Monitoring

• Clinical assessment for signs of over/under-dosage (weight, blood pressure, glucose, bone health) 1
• Do not routinely use hormonal markers for dose adjustment except in CAH 1
• Children: Monitor growth and pubertal development closely 1

Modified-Release Formulations

• Plenadren® (Duocort): Dual-release hydrocortisone approved in Europe, shows favorable effects on weight, blood pressure, and glycemic control compared to conventional hydrocortisone 1
• Chronocort®: Evening-dosed formulation for nocturnal cortisol rise, effective in CAH 1
• Infacort: Multiparticulate formulation designed for infants 1

The evidence strongly supports hydrocortisone as first-line therapy with specific weight-based dosing, emphasizes the critical importance of emergency preparedness, and provides clear stress-dosing algorithms to prevent potentially fatal adrenal crises.