Is a prednisolone dose of 15 mg per 5 mL administered twice daily appropriate for a 4‑year‑old child weighing 50 lb (≈23 kg)?

The prescribed dose is incorrect and potentially dangerous—this represents significant overdosing for this child.

Dose Calculation Error

The prescription of "15 mg/5ml BID" is ambiguous and likely represents 15 mg twice daily (30 mg/day total), which would be approximately 1.3 mg/kg/day for this 23 kg child. However, without knowing the clinical indication, this dosing is problematic:

For Nephrotic Syndrome (Most Common Pediatric Indication):

• Standard initial dosing: 60 mg/m² or 2 mg/kg/day as a single daily dose, maximum 60 mg/day 1
• For a 23 kg child: approximately 46 mg/day as a single morning dose
• The prescribed 30 mg/day total is underdosed if given BID, but the BID frequency is incorrect regardless—prednisolone should be given as a single daily morning dose to minimize HPA axis suppression 2

For Asthma Exacerbation:

• Standard dosing: 1-2 mg/kg/day (maximum 60 mg/day) for 3-10 days 3, 4
• For a 23 kg child: 23-46 mg/day
• The 30 mg/day total dose falls within range, but should be given as a single daily dose or divided into two doses maximum—not as "15 mg/5ml BID" which is confusing notation 3

Critical Issues with This Prescription

1. Concentration Confusion

The notation "15 mg/5ml" describes the concentration of the liquid formulation, not the dose. The prescription should specify:

• Dose per administration (e.g., "Give 15 mg PO BID" or "Give 5 mL PO BID of the 15 mg/5mL solution")
• As written, it's unclear if the prescriber means 15 mg twice daily or 5 mL (which equals 15 mg) twice daily

2. Frequency Error

• For nephrotic syndrome: Should be once daily in the morning 1, 2
• For asthma: Can be once or twice daily, but single daily dosing is preferred 3, 4
• BID dosing increases HPA axis suppression without additional benefit 2

3. Dosing Based on Ideal Body Weight

At 50 pounds (23 kg) for a 4-year-old, assess if the child is overweight. If significantly overweight, dose should be based on ideal body weight to avoid unnecessary steroid exposure 5

Correct Dosing Approach

If treating nephrotic syndrome:

• Initial episode: 60 mg/m² (approximately 46 mg) or 2 mg/kg (46 mg) once daily in the morning for 4-6 weeks 1, 6
• Using the 15 mg/5mL solution: Give 15 mL (45 mg) PO once daily in the morning
• Maximum dose: 60 mg/day 1

If treating asthma exacerbation:

• Dose: 1-2 mg/kg/day = 23-46 mg/day for 3-10 days 3, 4
• Using the 15 mg/5mL solution: Give 7.5-15 mL (22.5-45 mg) PO once daily
• Preferred: 30 mg (10 mL) once daily for moderate exacerbation 3

Common Pitfalls to Avoid

1. Never write concentration as the dose—specify either mg or mL with the concentration noted separately
2. Always use single daily morning dosing unless specific circumstances require divided dosing 1, 2
3. For children <30 kg, weight-based dosing (2 mg/kg) often underestimates BSA-based dosing (60 mg/m²)—use BSA calculation or the approximation formula [2 × weight in kg + 8] for 60 mg/m² dosing 7, 8
4. Verify the indication before prescribing—nephrotic syndrome requires prolonged therapy (12+ weeks), while asthma requires short bursts (3-10 days) 1, 3, 4

This prescription requires immediate clarification and likely correction before dispensing.