Is cefixime 200 mg administered twice daily more effective than a once‑daily 200 mg dose?

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Last updated: March 28, 2026 • View editorial policy

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Cefixime 200mg Dosing: Once Daily vs Twice Daily

For adults, cefixime should be given as 400 mg once daily, not 200 mg twice daily, as this is the FDA-approved dosing regimen that achieves optimal therapeutic outcomes. 1

FDA-Approved Adult Dosing

The FDA label is unequivocal: the recommended dose of cefixime for adults is 400 mg administered as a single daily dose 1. The 200 mg twice daily regimen you're asking about is not the standard adult dosing and would deliver the same total daily dose but in a non-approved schedule.

Pediatric Dosing Considerations

For pediatric patients (6 months or older), the FDA label provides more flexibility:

  • Total daily dose: 8 mg/kg/day
  • Can be given either:
    • As a single daily dose, OR
    • Divided into two doses of 4 mg/kg every 12 hours 1

Clinical trial data in nearly 400 children with otitis media compared these regimens directly:

  • 4 mg/kg twice daily (BID): 74% bacteriological eradication rate
  • 8 mg/kg once daily (QD): 81% bacteriological eradication rate 1

The once-daily regimen actually showed numerically superior outcomes (81% vs 74% eradication), though both achieved 69-70% clinical resolution of signs and symptoms 1.

Critical Caveat for Otitis Media

For otitis media specifically, the suspension formulation must be used because clinical trials demonstrated that the suspension achieves higher peak blood levels than tablets/capsules at equivalent doses 1. Do not substitute tablets for suspension in treating ear infections.

Why 400mg Once Daily for Adults?

The pharmacokinetics of cefixime support once-daily dosing due to its extended half-life. Splitting to 200 mg twice daily:

  • Provides no demonstrated clinical advantage
  • Reduces compliance
  • Is not supported by FDA approval or clinical trial data for adults

Bottom line: Use 400 mg once daily for adults. For pediatrics, once-daily dosing appears equally effective or potentially superior to twice-daily dosing based on bacteriological outcomes. 1

References

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