Adult & adolescent from 16 yr Monotherapy Starting dose: 250 mg bd. Initially increased to 500 mg bd after 2 wk. May be further increased by 250 mg bd every 2 wk depending upon the clinical response. Max: 1,500 mg bd.
Adult (≥18 yr) & adolescents (12-17 yr) weighing ≥50 kg Add-on therapy Initially 500 mg bd & may be increased up to 1,500 mg bd. Dose changes can be made in 500 mg bd increases or decreases every 2-4 wk.
Childn (4-11 yr) & adolescents (12-17 yr) weighing <50 kg Add-on therapy Initially 10 mg/kg bd. May be increased up to 30 mg/kg bd depending upon the clinical response & tolerability. Dose changes should not exceed increases or decreases of 10 mg/kg bd every 2 wk,
from 50 kg 500 mg bd. Max: 1,500 mg bd (adult dose),
25 kg 250 mg bd. Max: 750 mg bd,
20 kg 200 mg bd. Max: 600 mg bd,
15 kg 150 mg bd. Max: 450 mg bd.
Renal impairment: Severe (CrCl <30 mL/min/1.73 m2) 250-500 bd,
moderate (CrCl 30-49 mL/min/1.73 m2) 250-750 mg bd,
mild (CrCl 50-79 mL/min/1.73 m2) 500-1,000 mg bd.
ESRD patient undergoing dialysis Loading dose: 750 mg on the 1st day of treatment. 500-1,000 mg once daily. Following dialysis, 250-500 mg supplemental dose is recommended.
Hepatic impairment (CrCl <60 mL/min/1.73 m2) Reduce dose to ½ of daily maintenance dose.