Adult 0.5-1 g every 4-6 hr. Max: 4 g daily. Childn 6-12 yr 250-500 mg, 1-5 yr 120-250 mg, 3 mth-1 yr 60-120 mg, <3 mth 10 mg/kg (reduce to 5 mg/kg if jaundiced). May be given every 4-6 hr. Max: 4 doses in 24 hr. Post-immunisation pyrexiaChildn 2-3 mth 60 mg, then a 2nd dose may be given after 4-6 hr.