Key Points Translation

2021 Off-Label Use Recommendations for Intravenous Azithromycin in Children

1. Indications for Off-Label Use (超说明书适应症)

• Severe community-acquired pneumonia (CAP) in children with
  • Atypical pathogens (Mycoplasma, Chlamydia, Legionella)
  • Mixed bacterial infection
  • Severe clinical manifestations or respiratory failure
   
• Severe Mycoplasma pneumoniae pneumonia with
  • Lobar consolidation
  • Pleural effusion
  • Systemic inflammatory response
   
• Other severe refractory infections caused by macrolide-sensitive pathogens
   
  (when oral administration is not feasible)

2. Dosage Regimens (给药方案)

General severe pneumonia

• Loading dose: 10 mg/kg IV once daily on Day 1
• Maintenance dose: 5 mg/kg IV once daily from Day 2
• Duration: Total 3–5 days IV, then switch to oral step-down therapy

Severe/refractory Mycoplasma pneumonia

• 10 mg/kg IV once daily for 3–5 days
• May extend appropriately according to clinical response
• Step down to oral macrolide after defervescence and improvement

3. Route & Administration (给药途径与配制)

• Concentration: 1.0–2.0 mg/mL
• Infusion duration: 1–3 hours
• Avoid rapid infusion to reduce cardiovascular and gastrointestinal adverse events

4. Contraindications & Precautions (禁忌与慎用)

• Hypersensitivity to macrolides or excipients
• Caution in patients with
  • Severe hepatic impairment
  • Cardiac arrhythmia, prolonged QTc interval
  • Myasthenia gravis
  • Electrolyte disturbances (hypokalemia, hypomagnesemia)
   

5. Key Safety Monitoring (安全性监测要点)

• ECG monitoring for QTc prolongation
• Liver function at baseline and during treatment
• Gastrointestinal symptoms (abdominal pain, vomiting, diarrhea)
• Cardiac symptoms: palpitations, chest discomfort
• Avoid co-administration with other QTc-prolonging drugs

6. Principle of Off-Label Use (超说明书用药原则)

• Informed consent from guardians must be obtained
• Restricted to severe infections where benefit outweighs risk
• Used as part of comprehensive antimicrobial therapy
• Avoid unnecessary prolonged use

7. Switch to Oral Therapy (序贯口服转换)

• Switch to oral azithromycin or other macrolides when
  • Fever resolves
  • Inflammatory markers decline
  • Oral intake is tolerated
   
• Total treatment course generally 7–10 days (individualized for severe cases)