Metronidazole Pediatric Dose Calculator
Harriet Lane–based dosing records for Metronidazole. Use with patient weight, indication, and local antimicrobial stewardship policy.
Search full dosage browser for Metronidazole
Metronidazole
Generic: Flagyl
Indication: Anaerobic infections, Amebiasis, Giardiasis, Trichomoniasis, C. difficile
Pediatric dosage: Anaerobic infections: 30-40 mg/kg/day PO/IV divided every 6-8 hours (Max 4 g/day).
C. difficile: 30 mg/kg/day PO divided every 6 hours for 10-14 days.
Amebiasis: 35-50 mg/kg/day PO divided every 8 hours for 7-10 days.
Giardiasis: 15 mg/kg/day PO divided every 8 hours for 5-7 days.
Route: PO, IV
Frequency: Every 6-8 hours
Warnings: Disulfiram-like reaction with alcohol. Neurotoxicity (peripheral neuropathy) with prolonged use.
Ceftazidime-Avibactam
Generic: Ceftazidime + Avibactam
Indication: Complicated intraabdominal infection (with metronidazole), complicated urinary tract infection including pyelonephritis, hospitalacquired/ventilatorassociated pneumonia due to susceptible gramnegative organisms including certain carbapenemresistant Enterobacterales and Pseudomonas.
Pediatric dosage: >=3 months: 50 mg/kg (ceftazidime component) + 12.5 mg/kg (avibactam) IV every 8 hr, infused over 2 hr (maximum 2 g/0.5 g per dose).
Route: IV
Frequency: Every 8 hr.
Warnings: Hypersensitivity reactions; seizures with high doses in renal dysfunction; adjust for renal impairment. Selection of resistant organisms possible; reserve for proven/suspected MDR pathogens.
Ceftolozane-Tazobactam
Generic: Ceftolozane + Tazobactam
Indication: Complicated intraabdominal infection (with metronidazole) and complicated urinary tract infection including pyelonephritis; activity vs MDR Pseudomonas.
Pediatric dosage: >=3 months: 20 mg/kg (ceftolozane) + 10 mg/kg (tazobactam) IV every 8 hr, infused over 1 hr (maximum 1 g/0.5 g per dose for cIAI/cUTI).
Route: IV
Frequency: Every 8 hr.
Warnings: Hypersensitivity; seizures in predisposed patients; adjust for renal impairment.