TAB - 600 MG EVERY 12 HRS USUALLY FOR 10 - 14 DAYS ; CHILD 1 WK - 12 YRS , 10 MG / KG EVERY 8 HRS ; 12 - 18 YRS ADULT DOSE . INJ - BY IV INF OVER 30 - 120 MIN , 600 MG EVERY 12 HRS ; CHILD 1 WK - 12 YRS 10 MG / KG EVERY 8 HRS ;12 - 18 TRS ADULT DOSE.