Adult & childn >12 yr Effective dose: 900-1,800 mg daily. Dose titration: Day 1: 300 mg once daily. Day 2: 300 mg twice daily. Day 3: 300 mg 3 times daily. Dose may be increased to 1,200 mg daily in 3 divided doses, & may continue titration using increments of 300 mg daily in 3 divided doses until max of 2,400 mg daily. Max interval of 3 times daily dose: 12 hr.
Impaired kidney function CrCl >60 mL/min 400 mg 3 times daily. Total daily dose: 1,200 mg,
30-60 mL/min 300 mg twice daily. Total daily dose: 600 mg,
15-30 mL/min 300 mg once daily. Total daily dose: 300 mg,
<15 mL/min 300 mg daily. Total daily dose: 150 mg.
Patient undergoing hemodialysis 300-400 mg loading dose. Maintenance dose: 200-300 mg every 4 hr of hemodialysis.