Adult 1-6 g daily IV or IM inj in 2 or 3 divided doses.
Urinary tract & less severe infections 500 mg or 1 g every 12 hr.
Most infections 1 g every 8 hr or 2 g every 12 hr.
Very severe infections in immunocompromised patient including those w/ neutropenia 2 g every 8 or 12 hr or 3 g every 12 hr.
Fibrocystic adult w/ pseudomonal lung infections 100-150 mg/kg daily in 3 divided doses.
Infant & childn >2 mth 30-100 mg/kg daily in 2 or 3 divided doses.
Immunocompromised or fibrocystic childn or childn w/ meningitis Up to 150 mg/kg daily in 3 divided doses. Max: 6 g daily.
Neonate 0-2 mth 25-60 mg/kg daily in 2 divided doses.
Elderly Max: 3 g daily.
Renal impairment CrCl 31-50 mL/min 1 g every 12 hr,
16-30 mL/min 1 g every 24 hr,
6-15 mL/min 0.5 g every 24 hr,
<5 mL/min 0.5 g every 48 hr.
Renal failure patient on continuous arteriovenous haemodialysis or high-flux haemofiltration 1 g daily as single dose or in divided doses.