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Meropenum neonates dosage according to neofax

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meropenem neonates dosage NeoFax mg/kg

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meropenem NeoFax neonatal dosing table gestational age postnatal age

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I now have complete neonatal meropenem dosing data from the Harriet Lane Handbook (which uses NeoFax/standard neonatal references). Here is the full structured answer:

Meropenem - Neonatal Dosage (per NeoFax / Harriet Lane)

Source: The Harriet Lane Handbook, 23rd Edition (Johns Hopkins Hospital), Meropenem entry, pp. 1229-1230

Non-CNS General Dosing (Meropenem MIC < 4 mcg/mL)

Dosing is based on weight and postnatal age (PNA):
WeightPostnatal AgeDoseInterval
≤ 2 kg≤ 14 days20 mg/kg/doseEvery 12 hr
≤ 2 kg15-28 days20 mg/kg/doseEvery 8 hr
≤ 2 kg29-60 days30 mg/kg/doseEvery 8 hr
> 2 kg≤ 14 days20 mg/kg/doseEvery 8 hr
> 2 kg15-60 days30 mg/kg/doseEvery 8 hr

Non-CNS Infection with Moderately Resistant Isolate (MIC 4-8 mcg/mL)

  • > 30 wks' gestation AND > 7 days old: 40 mg/kg/dose IV Q8 hr
  • (Based on single-dose PK simulation study)

Intra-Abdominal Infection (Meropenem MIC < 4 mcg/mL)

Dosing based on gestational age (GA) and postnatal age:
Gestational AgePostnatal AgeDoseInterval
< 32 wks< 14 days20 mg/kg/doseEvery 12 hr
< 32 wks≥ 14 days20 mg/kg/doseEvery 8 hr
≥ 32 wks< 14 days20 mg/kg/doseEvery 8 hr
≥ 32 wks≥ 14 days30 mg/kg/doseEvery 8 hr

Meningitis (Limited Data)

WeightPostnatal AgeDoseInterval
≤ 2 kg≤ 14 days40 mg/kg/doseEvery 12 hr
≤ 2 kg15-60 days40 mg/kg/doseEvery 8 hr
> 2 kg≤ 60 days40 mg/kg/doseEvery 8 hr
For infants 1-3 months: 40 mg/kg/dose Q8 hr (IDSA 2004 guidelines)

Route & Administration

  • Route: IV only
  • Standard infusion: 30 minutes
  • Extended infusion (preferred for resistant organisms): 4 hours - improves time above MIC and associated with better outcomes in neonatal gram-negative late-onset sepsis (lower mortality: 14% vs 31%)

Key Clinical Notes

  • Renal impairment: dose reduction/interval extension recommended; consult pharmacy (no clear neonatal guidance)
  • Hepatic impairment: no adjustment required
  • Drug interactions: probenecid increases meropenem levels; meropenem reduces valproic acid levels (important interaction)
  • Use with caution in CNS disorders - may cause seizures
  • Contraindicated with history of anaphylaxis to beta-lactams or carbapenems
  • Sodium load: 3.92 mEq Na per gram of drug

Compatible Fluids

Normal saline 0.9% (preferred), Water for Injection, Dextrose 5%
  • Harriet Lane Handbook, 23rd Ed., pp. 1229-1230
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