Agammaglobulinemia, hypogammaglobulinemia & combination therapy w/ antibiotics for severe infections Adult 2,500-5,000 mg as single doseIV. Childn 100-150 mg/kg as single dose IV instillation or inj (very slowly). Idiopathic thrombocytopenic purpura 200-400 mg/kg/day. Kawasaki disease & Guillain-Barré syndrome 400 mg/kg/day for 5 consecutive days.