How to Prescribe a Steroid for a Child with Poison Ivy
For a child with poison ivy dermatitis, prescribe oral prednisone 1-2 mg/kg/day (maximum 60 mg) for 14-21 days with a gradual taper, avoiding short courses that lead to rebound dermatitis. 1, 2, 3
Systemic vs. Topical Approach
The decision between topical and systemic steroids depends on body surface area involvement:
- Localized disease (<20% body surface area): Use mid- to high-potency topical steroids such as triamcinolone 0.1% 1
- Extensive disease (>20% body surface area): Systemic oral corticosteroids are required and provide relief within 12-24 hours 1
Oral Steroid Dosing and Duration
The critical error to avoid is prescribing too short a course, which causes rebound dermatitis. Evidence shows that:
- Courses of 1-13 days significantly increase return visits (OR 1.30) compared to longer courses 2
- A 15-day course (starting at 40 mg with taper) reduces the need for additional medications compared to 5-day courses (22.7% vs. 55.6%, p=0.02) 3
- Prednisone should be tapered over 2-3 weeks to prevent rebound dermatitis 1
Recommended Regimen:
Start with prednisone 1-2 mg/kg/day (max 40-60 mg) for 5-7 days, then taper over the next 7-14 days. For example:
- Days 1-5: 40 mg daily
- Days 6-7: 30 mg daily
- Days 8-9: 20 mg daily
- Days 10-11: 10 mg daily
- Days 12-15: 5 mg daily
Special Considerations for Children
Avoid high-potency topical steroids in children, particularly in intertriginous areas and on the face. 4, 5, 6
Key pediatric precautions:
- Children are at higher risk for steroid side effects including atrophy and systemic absorption 4
- Never use clotrimazole-betamethasone (Lotrisone) in children - this contains a high-potency fluorinated steroid and is frequently misused by pediatricians who don't recognize its potency 5, 6
- Lower potency topical steroids should be used when topical therapy is appropriate 4, 7
- Monitor closely for adverse effects 4
Application Instructions
For topical steroids (when appropriate for localized disease):
- Apply once or twice daily 7
- Use the fingertip unit method: one fingertip unit covers approximately 2% body surface area 7
- Mid- to high-potency topical steroids can be used for up to 3-12 weeks depending on potency 7
Common Pitfalls
- Prescribing short courses (<14 days): This is the most common error and leads to rebound dermatitis requiring return visits 1, 2, 3
- Using high-potency combination products: Pediatricians frequently prescribe clotrimazole-betamethasone inappropriately, unaware it contains a high-potency steroid 5, 6
- Rapid discontinuation: Always taper systemic steroids over 2-3 weeks 1