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What is the doses of Antibiotics in pediatric patients
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Antibiotic Doses in Pediatric Patients
Important note: All pediatric doses are weight-based (mg/kg/day). The maximum dose should never exceed the standard adult dose. Always verify current dosing references before prescribing.
General Principles
- Doses are expressed as mg/kg/day (total daily dose) or mg/kg/dose (per individual dose)
- Renal and hepatic function, age (neonate vs. infant vs. child), and severity of infection all affect dosing
- Neonates (<28 days) require separate dosing schedules (not covered in full here)
1. Penicillins
| Antibiotic | Dose | Frequency | Route |
|---|---|---|---|
| Amoxicillin (standard) | 45 mg/kg/day | q12h | PO |
| Amoxicillin (high-dose, AOM, sinusitis) | 80-90 mg/kg/day | q12h | PO |
| Amoxicillin-Clavulanate (high-dose) | 80-90 mg/kg/day of amoxicillin component | q12h | PO |
| Ampicillin | 50 mg/kg/dose | q6h | IV/IM |
| Ampicillin-Sulbactam | 50 mg/kg of ampicillin component | q6h | IV |
| Piperacillin-Tazobactam | 100 mg/kg piperacillin (children >9 months, <40 kg) | q8h | IV |
Sources: Red Book 2021, Harrison's Principles of Internal Medicine 22E, Campbell Walsh Wein Urology
2. Cephalosporins
| Antibiotic | Dose | Frequency | Route |
|---|---|---|---|
| Cefazolin (1st gen) | 30 mg/kg/dose (surgical prophylaxis); 25-50 mg/kg/day (treatment) | q8h | IV |
| Cephalexin (1st gen) | 20-25 mg/kg/dose | q6h | PO |
| Cefuroxime (2nd gen) | 50 mg/kg/dose (prophylaxis); 30-40 mg/kg/day (treatment) | q8h | IV/PO |
| Cefoxitin (2nd gen) | 40 mg/kg/dose | q6h | IV |
| Cefotetan (2nd gen) | 40 mg/kg/dose | q12h | IV |
| Cefdinir (3rd gen) | 14 mg/kg/day | q12-24h | PO |
| Ceftriaxone (3rd gen) | 50-75 mg/kg/day | q24h (or q12h for meningitis) | IV/IM |
| Cefotaxime (3rd gen) | 50 mg/kg/dose | q6-8h | IV |
| Cefepime (4th gen) | 50 mg/kg/dose (max 2 g for febrile neutropenia/P. aeruginosa) | q8h | IV |
Sources: Campbell Walsh Wein Urology, Rosen's Emergency Medicine, Red Book 2021
3. Macrolides
| Antibiotic | Dose | Frequency | Route |
|---|---|---|---|
| Azithromycin | 10 mg/kg on Day 1, then 5 mg/kg/day on Days 2-5 (or 20 mg/kg single dose for cholera) | Once daily | PO |
| Erythromycin | 12.5 mg/kg/dose | q6h (4 times/day) | PO |
| Clarithromycin | 7.5 mg/kg/dose | q12h | PO |
4. Aminoglycosides
| Antibiotic | Dose | Notes |
|---|---|---|
| Gentamicin | 2.5 mg/kg/dose q8h (or 5-7 mg/kg once daily for extended-interval dosing) | Monitor levels; nephrotoxic |
| Tobramycin | 2.5 mg/kg/dose q8h | Monitor levels |
| Amikacin | 15-22.5 mg/kg/day divided q8h | Monitor levels |
5. Glycopeptides
| Antibiotic | Dose | Frequency | Notes |
|---|---|---|---|
| Vancomycin | 15 mg/kg/dose (surgical prophylaxis); 40-60 mg/kg/day (treatment of serious infections) | q6h | Monitor trough levels; infuse over ≥60 min |
Source: Campbell Walsh Wein Urology, Red Book 2021
6. Tetracyclines
| Antibiotic | Dose | Notes |
|---|---|---|
| Doxycycline | 4.4 mg/kg as single dose (cholera); 2-4 mg/kg/day q12h for other infections | Avoid in children <8 years (dental staining) |
| Tetracycline | 12.5 mg/kg/dose q6h for 3 days | Children ≥8 years only |
7. Fluoroquinolones
| Antibiotic | Dose | Notes |
|---|---|---|
| Ciprofloxacin | 10-15 mg/kg/dose q12h | Generally not recommended <18 years except specific indications (anthrax, cholera, complicated UTI) |
| Levofloxacin | 10 mg/kg/dose | Restricted use in children |
8. Other Antibiotics
| Antibiotic | Dose | Notes |
|---|---|---|
| Clindamycin | 10 mg/kg/dose q6-8h | Good for anaerobes, MRSA soft tissue |
| Metronidazole | 15 mg/kg/day (neonates <1200g: 7.5 mg/kg); 30 mg/kg/day for C. difficile | q8h |
| Aztreonam | 30 mg/kg/dose | q6-8h IV; for gram-negative coverage in penicillin allergy |
| Ertapenem | 15 mg/kg/dose (max 1 g) | q12h in children <13 years |
| Trimethoprim-Sulfamethoxazole (TMP-SMX) | 8-10 mg TMP/kg/day | q12h; avoid in neonates <6 weeks |
| Nitrofurantoin | 5-7 mg/kg/day | q6h; UTI only; avoid <1 month |
Endocarditis Prophylaxis (Single Dose Before Procedure)
| Drug | Dose |
|---|---|
| Amoxicillin (oral) | 50 mg/kg (max 2 g) |
| Ampicillin (IV) | 50 mg/kg |
| Cefazolin or Ceftriaxone (IV/IM) | 50 mg/kg |
| Clindamycin (penicillin allergy) | 20 mg/kg |
Source: Red Book 2021 - Table 3, Cummings Otolaryngology
Key Clinical Reminders
- Maximum dose = do not exceed the usual adult dose
- Neonates have immature renal/hepatic function - use neonatal-specific tables
- Renal impairment - reduce doses for aminoglycosides, vancomycin, carbapenems
- Drug monitoring - Vancomycin and aminoglycosides require serum level monitoring
- Fluoroquinolones and tetracyclines have age restrictions in children
- Always check allergy history before prescribing penicillins/cephalosporins
Data synthesized from: Red Book 2021 (Committee on Infectious Diseases), Harrison's Principles of Internal Medicine 22E, Rosen's Emergency Medicine, Campbell Walsh Wein Urology, and Goodman & Gilman's Pharmacological Basis of Therapeutics.
Disclaimer: This is a clinical reference summary. Always verify doses in a current formulary (e.g., BNF for Children or Red Book Online) before prescribing, as doses vary by indication and infection severity.
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