What is the recommended pediatric dosage of cefixime (oral) based on weight and infection severity?

Cefixime Dosing in Pediatrics

Standard FDA-Approved Dosing

The recommended pediatric dose of cefixime is 8 mg/kg/day, administered either as a single daily dose or divided into 4 mg/kg every 12 hours for children 6 months and older. 111

Weight-Based Dosing Table

The FDA provides specific dosing recommendations by weight range 11:

• 5–7.5 kg: 50 mg/day (2.5 mL of 100 mg/5 mL suspension)
• 7.6–10 kg: 80 mg/day (4 mL of 100 mg/5 mL or 2 mL of 200 mg/5 mL)
• 10.1–12.5 kg: 100 mg/day (5 mL of 100 mg/5 mL or 2.5 mL of 200 mg/5 mL)
• 12.6–20.5 kg: 150 mg/day (7.5 mL of 100 mg/5 mL or 4 mL of 200 mg/5 mL)
• 20.6–28 kg: 200 mg/day (10 mL of 100 mg/5 mL or 5 mL of 200 mg/5 mL)
• 28.1–33 kg: 250 mg/day (12.5 mL of 100 mg/5 mL or 6 mL of 200 mg/5 mL)
• 33.1–40 kg: 300 mg/day (15 mL of 100 mg/5 mL or 7.5 mL of 200 mg/5 mL)
• 40.1–45 kg: 350 mg/day (17.5 mL of 100 mg/5 mL or 9 mL of 200 mg/5 mL)
• >45 kg or >12 years: 400 mg/day (adult dose) 11

Dosing by Indication

Otitis Media

• Must use suspension formulation (not tablets/capsules) because suspension achieves higher peak blood levels at equivalent doses 111
• Dose: 8 mg/kg/day as single daily dose or divided every 12 hours 11
• Duration: Typically 5–10 days 2

Pharyngitis/Tonsillitis (Streptococcus pyogenes)

• Dose: 8 mg/kg/day 111
• Duration: Minimum 10 days (mandatory for streptococcal infections to prevent rheumatic fever) 111
• Efficacy: 5-day cefixime therapy showed 86.7% cure rate versus 90.8% with 10-day penicillin V, though 10 days remains the FDA-mandated duration 3

Urinary Tract Infections

• Dose: 8 mg/kg/day once daily 4
• Duration: 7–10 days 4
• Efficacy: Once-daily cefixime showed comparable efficacy to twice-daily trimethoprim-sulfamethoxazole with 85% cure rate 4

Respiratory Tract Infections (Bronchitis, Pneumonia)

• Dose: 8 mg/kg/day 112
• Duration: Median 6 days, with 98% cure/improvement rate in post-marketing surveillance 2

Enteric Fever (Typhoid)

• Higher dose required: 20 mg/kg/day divided into two doses every 12 hours 5
• Duration: Minimum 12 days 5
• Note: This is an off-label higher dose for multi-drug resistant Salmonella typhi 5

Clinical Context and Guideline Positioning

When Cefixime Is Appropriate

Cefixime is listed as an alternative oral agent for β-lactamase-producing Haemophilus influenzae infections in pediatric pneumonia guidelines, alongside cefdinir, cefpodoxime, and ceftibuten 6

When Cefixime Is NOT First-Line

• Pneumococcal pneumonia: High-dose amoxicillin (90 mg/kg/day) remains the preferred first-line agent 678
• Streptococcal pharyngitis: Penicillin is the usual drug of choice; cefixime is an alternative 1
• Acute otitis media: Amoxicillin or high-dose amoxicillin-clavulanate is preferred when β-lactamase producers are suspected 8

Administration and Formulation Details

Available Concentrations

• 100 mg/5 mL suspension 11
• 200 mg/5 mL suspension 11
• 400 mg capsules (for adolescents/adults) 11

Reconstitution

• After reconstitution, suspension remains stable for 14 days at room temperature or refrigerated 11
• Shake well before each use 11

Food Interactions

• May be administered without regard to food 11

Renal Dosing Adjustments

Pediatric-specific renal dosing is not provided in FDA labeling, but adult guidelines suggest 11:

• CrCl ≥60 mL/min: Normal dose
• CrCl 21–59 mL/min: Reduce to approximately 65% of normal dose
• CrCl ≤20 mL/min: Reduce to approximately 43% of normal dose

Safety Profile

Adverse Events

• Incidence: 1.92% in children in post-marketing surveillance 2
• Most common: Mild gastrointestinal disturbances (diarrhea) 932
• Severity: Typically mild; rarely necessitates discontinuation 934

Contraindications

• Known allergy to cefixime or other cephalosporins 1

Critical Clinical Pitfalls

Do Not Use Tablets/Capsules for Otitis Media

The suspension formulation is mandatory for otitis media because clinical trials demonstrating efficacy used suspension, and tablets produce lower peak levels 111

Ensure Adequate Duration for Streptococcal Infections

Always complete a full 10-day course for Streptococcus pyogenes pharyngitis/tonsillitis, even though clinical improvement occurs earlier, to prevent rheumatic fever 111

Specify Concentration When Prescribing

Always include the suspension concentration (100 mg/5 mL or 200 mg/5 mL) in prescriptions to prevent dosing errors, as both concentrations are commercially available 11

Emerging Resistance Concerns

• Gonorrhea treatment failure: Cefixime 400 mg single-dose showed 6.77% failure rate overall and 25% failure when MIC ≥0.12 μg/mL, particularly for pharyngeal and rectal infections 10
• Implication: Cefixime is no longer recommended as first-line monotherapy for gonorrhea in many jurisdictions 10