Ofloxacin Dosing Per Kilogram
For children aged ≥1 month to ≤17 years, the recommended dose of ofloxacin is 7.5 mg/kg every 12 hours orally (maximum 400 mg/dose). 1
Adult Dosing
For adults aged ≥18 years, ofloxacin is dosed at 400 mg every 12 hours orally (not weight-based). 1
Pediatric Dosing Details
The 2021 CDC guidelines for plague treatment and prophylaxis provide the most authoritative weight-based dosing for ofloxacin in children:
- Dose: 7.5 mg/kg every 12 hours orally
- Maximum dose: 400 mg per dose
- Age range: Children ≥1 month to ≤17 years
- Route: Oral only (no IV formulation recommendations provided)
This dosing applies across multiple clinical scenarios including:
- Treatment of pneumonic, septicemic, bubonic, or pharyngeal plague 1
- Pre- and postexposure prophylaxis 1
Important Clinical Considerations
Ofloxacin is listed as an alternative agent, not first-line therapy, in pediatric populations. First-line fluoroquinolones for children include ciprofloxacin (15 mg/kg every 12 hours) and levofloxacin (8 mg/kg every 12 hours for children <50 kg). 1
Key limitation: Ofloxacin suspension for oral liquid administration is not available in the United States, which may complicate administration in young children who cannot swallow tablets. 1 Crushed tablets may result in lower serum concentrations than expected. 2
Pregnant Women
For pregnant women, ofloxacin dosing is 400 mg every 12 hours orally (same as non-pregnant adults), though it is listed as an alternative rather than first-line agent. 1
Pharmacokinetic Context
The FDA label indicates ofloxacin achieves peak serum concentrations 1-2 hours after oral dosing, with approximately 98% bioavailability. 3 The elimination half-life is 4-5 hours in the primary phase. 3 Research in drug-resistant tuberculosis patients receiving 10 mg/kg once daily showed mean Cmax of 9.61 ± 2.17 mcg/ml with adequate MIC ratios. 4
Pediatric pharmacokinetics differ from adults: Children eliminate ofloxacin more rapidly, resulting in lower drug exposures than adults at equivalent mg/kg doses. 2 This supports the twice-daily dosing regimen rather than once-daily dosing used in some adult protocols.
Common Pitfalls
- Do not exceed 400 mg per dose in children regardless of weight, as this is the established maximum safe dose
- Avoid in children <1 month of age due to insufficient safety data
- Consider alternative fluoroquinolones (ciprofloxacin or levofloxacin) as first-line agents when treating serious infections in children, reserving ofloxacin for situations where alternatives are unavailable or contraindicated
- Monitor for tendon disorders, particularly in patients receiving concomitant corticosteroids 3