IM/IVAdult & childn >12 yr 1-2 g once daily. Max: 4 g once daily. Childn & infant 20-50 mg/kg once daily. Severe infection Up to 80 mg/kg once daily. Neonate Max: 50 mg/kg once daily. IV doses should be given over 60 min. Doses >50 mg/kg should be administered by IV infusion only. Bacterial meningitisChildn & infant Initially 100 mg/kg once daily. Max: 4 g daily. Duration of treatment: N. meningitidis 4 days. Strep pneumoniae 7 days. H. influenzae 6 days. Susceptible Enterobacteriaceae 10-14 days.