What oral corticosteroid dose is appropriate for a 5‑year‑old child weighing 20 lb (≈9 kg) with cough?

Oral Corticosteroid Dosing for Cough in a 5-Year-Old Child Weighing 20 lbs

For a 5-year-old with cough, give dexamethasone 0.6 mg/kg (approximately 5.5 mg for this 9 kg child, maximum 16 mg) as a single oral dose—but only if the cough is from croup (characterized by barking, seal-like cough with stridor). 1, 2

Critical First Step: Identify the Cause of Cough

The appropriate steroid dose depends entirely on why the child is coughing:

If This Is Croup (Laryngotracheobronchitis)

• Recognizable features: Barking, seal-like cough with inspiratory stridor, hoarse voice, and variable respiratory distress 1, 3
• Dose: Dexamethasone 0.6 mg/kg orally as a single dose (for this 20 lb/9 kg child = approximately 5.5 mg; maximum 16 mg) 1, 2
• Route: Oral is preferred when the child can tolerate it—equally effective as IM or IV but avoids injection pain 1, 2
• Onset: Clinical improvement begins within 30 minutes to 2 hours 1, 3
• Duration: Single dose provides 24-72 hours of relief with no tapering needed and no significant adrenal suppression 1, 2

If This Is Asthma-Related Cough

• Only use steroids if there is clear evidence of asthma exacerbation (wheezing, documented airflow obstruction, known asthma diagnosis) 4, 3
• Dose for asthma exacerbation: Prednisolone or prednisone 1-2 mg/kg/day orally for 3-5 days (for this 9 kg child = 9-18 mg/day) 4, 5
• Important caveat: For chronic asthma management in children ≥5 years, inhaled corticosteroids are the preferred long-term therapy, not oral steroids 4

If This Is Nonspecific Cough, Acute Bronchitis, or Viral Cough

• Do NOT give oral steroids 4, 3
• There is no evidence that oral corticosteroids benefit nonspecific cough in children, and one RCT showed a nonsignificant increase in hospitalizations when oral steroids were used for wheezing without clear asthma 4
• Acute bronchitis is viral and self-limiting (7-10 days); steroids provide no benefit 3, 6
• For pertussis-associated cough, dexamethasone provides no significant relief 4

Common Pitfalls to Avoid

• Do not use prednisolone for croup—it has a higher re-presentation rate (29%) compared to dexamethasone (7%) 2, 3
• Do not use lower dexamethasone doses (e.g., 0.15 mg/kg) for croup; the American Academy of Pediatrics standard is 0.6 mg/kg 1, 2
• Do not prescribe steroids for simple cough without clear evidence of croup or asthma exacerbation—systemic steroids have significant side effects and no proven benefit for nonspecific cough 4, 3
• Do not use nebulized epinephrine for mild croup—it is reserved for moderate-to-severe croup with stridor at rest, marked retractions, or agitation (dose: 0.5 mL/kg of 1:1000 solution, maximum 5 mL) 1, 2
• Do not use inhaled corticosteroids (via MDI/spacer) for acute cough or croup—they are ineffective for these conditions 2

Algorithm for Decision-Making

1. Does the child have barking cough with stridor?

   • Yes → Croup: Give dexamethasone 0.6 mg/kg orally once 1, 2
   • No → Go to step 2

2. Does the child have documented asthma with wheezing or airflow obstruction?

   • Yes → Asthma exacerbation: Give prednisolone 1-2 mg/kg/day for 3-5 days 4, 5
   • No → Go to step 3

3. Is this nonspecific cough, viral bronchitis, or pertussis?

   • Yes → Do NOT give steroids: Supportive care only 4, 3, 6