IV/IM Adult 1-6 g/day in 2 or 3 divided doses.
UTI & less serious infections 500 mg or 1 g 12 hrly.
Most infections 1 g 8 hrly or 2 g 12 hrly.
Very severe infections particularly in immunocompromised patients 2 g 8 or 12 hrly or 3 g 12 hrly.
Fibrocystic w/ pseudomonal lung infections 100-150 mg/kg/day in 3 divided doses.
Prophylaxis in prostatic surgery 1 g at the induction of anesth. Inj 2nd dose during catheter removal.
Infant & childn >2 mth 30-100 mg/kg/day in 2 or 3 divided doses.
Immunocompromised or fibrocystic childn or w/ meningitis Up to 150 mg/kg/day in 3 divided dose. Max: 6 g/day.
Neonate (0-2 mth) 25-60 mg/kg/day in 2 divided doses.
Elderly (>80 yr) Max: 3 g/day.
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