IM/IV Adult Serious infection 3 mg/kg/day in 3 equal doses 8 hrly.
Life-threatening infection Up to 5 mg/kg/day in 3 or 4 equal doses.
Childn 2-2.5 mg/kg 8 hrly.
Neonate & infant >1 wk 2.5 mg/kg 8 hrly,
Premature or full-term neonate ≤1 wk 2.5 mg/kg 12 hrly.