Steroid Dose Equivalency and Conversion

Standard Equivalent Conversions

• The American College of Rheumatology defines prednisone 5 mg as equivalent to hydrocortisone 20 mg and methylprednisolone 4 mg, with standard dosing ranging from 0.3-2 mg/kg/day depending on disease severity 1
• These conversions are critical for perioperative management and when switching between formulations 1

Dose Categories by Intensity

• The American College of Rheumatology defines three key dosing thresholds: low-dose (<7.5 mg/day prednisone), medium-dose (7.5-30 mg/day prednisone), and high-dose (>30 mg/day prednisone) 2
• Very high-dose glucocorticoid therapy is defined as ≥30 mg/day prednisone for ≥30 days or cumulative dose ≥5 g over 1 year, which carries significantly increased fracture risk (vertebral fracture relative risk 14, hip fracture relative risk 3) 3, 4

Initial Dosing by Disease Severity

• For severe disease, the initial dose is 1-2 mg/kg/day (maximum 60 mg/day) 2, 5
• For moderate disease, the initial dose is 0.5-1 mg/kg/day 2, 5
• For mild disease, the initial dose is 0.3-0.5 mg/kg/day 2, 5

Maintenance Dosing Strategy

• After achieving disease control, taper to the lowest effective dose, typically 5-10 mg/day or less 2
• The tapering protocol should follow a gradual approach to minimize adrenal insufficiency risk and disease flare 2

Critical Safety Thresholds

• Adrenal suppression risk occurs with any dose >7.5 mg/day for >3 weeks, requiring stress-dose coverage during illness or surgery 2
• Glucocorticoid-induced osteoporosis (GIOP) prevention is mandatory for doses ≥2.5 mg/day for ≥3 months, including calcium and vitamin D supplementation, and bisphosphonates for those with low bone mineral density 6, 3

Perioperative Steroid Management

• For patients on chronic steroids undergoing surgery, continue equivalent IV dosing perioperatively, converting oral prednisone to IV hydrocortisone using 5 mg prednisone = 20 mg hydrocortisone 1
• No evidence supports increasing steroid dosage to cover surgical stress 1

Special Population Considerations

• For immune checkpoint inhibitor toxicities, prednisone doses are 0.5-1 mg/kg/day for grade 2, and 1-2 mg/kg/day for grade 3-4 7
• For bullous pemphigoid, severe disease requires 0.75-1 mg/kg/day, moderate disease requires 0.5 mg/kg/day, and mild disease requires 0.3 mg/kg/day 8, 5

Common Pitfalls to Avoid

• Do not use uniform dosing without weight adjustment, as weight-based dosing (mg/kg) is more appropriate for optimizing efficacy while minimizing toxicity 8, 2
• Do not neglect osteoporosis prevention, including calcium and vitamin D supplementation, lifestyle modifications, and bisphosphonates for those with low bone mineral density 6, 3