Maximum Daily Azithromycin Suspension Volume
For azithromycin suspension 200 mg/5 mL, the maximum daily dose volume is 12.5 mL (500 mg) for patients weighing ≥50 kg, which represents the adult maximum daily dose. 1
Weight-Based Maximum Daily Volumes
The maximum volume depends on the indication and patient weight:
Standard Pediatric Dosing (Most Infections)
- Day 1 loading dose: Maximum 12.5 mL (500 mg) for patients ≥50 kg 1
- Days 2-5 maintenance: Maximum 6.25 mL (250 mg/day) for patients ≥50 kg 1
Pharyngitis/Tonsillitis (Higher Dose Required)
- 12 mg/kg/day for 5 days: Maximum 12.5 mL (500 mg) daily for patients weighing 40-50 kg 1
- This indication requires higher daily dosing throughout the 5-day course 2
Single-Dose Regimen for Acute Otitis Media
- 30 mg/kg as single dose: Maximum 37.5 mL (1,500 mg) as a one-time dose for patients ≥50 kg 1
- This is the highest single-day volume but is only given once, not daily 1
Key Clinical Considerations
The 500 mg daily maximum (12.5 mL) applies to the standard 5-day regimen on Day 1 only. 1 After the loading dose, the maximum drops to 250 mg (6.25 mL) for Days 2-5 in most infections.
For streptococcal pharyngitis, use 12 mg/kg once daily for 5 days (not the standard 10/5 mg/kg regimen), as the lower dose is inferior to penicillin. 2 This means patients may receive up to 12.5 mL daily for all 5 days if they weigh ≥40 kg.
Important Caveats
- Antacid interaction: Do not co-administer with aluminum- or magnesium-containing antacids, as these markedly reduce absorption; separate by at least 2 hours 2
- Dose rounding: The suspension may be rounded by 5-10% to facilitate home administration (e.g., 12.5 mL can be given as 2½ teaspoons) 2
- Renal impairment: Exercise caution in severe renal impairment (GFR <10 mL/min), though no specific dose adjustment is provided 1