THE USUAL ADULT DOSE :- 0.5 TO 1 GM EVERY 6 TO 12 HOURLY. MAXIMUM 6 GM DAILY. 12 GM USED FOR SEVERE LIFE-THREATENING INFECTIONS. CHILDREN OVER 1 MONTH :- 25 TO 50 MG/KG/BODY WT. THREE OR FOUR DIVIDED DOSES DAILY. MAXIMUM :- 100 MG/KG DAILY. PROPHYLAXIS OF INFECTION DURING SURGERY :- 1 GM 1/2 TO 1 HOUR PRIOR TO THE OPERATION, FOLLOWED BY 0.5 TO 1 GM DURING SURGERY FOR LENGTHY PROCEDURES. 0.5 TO 1 GM GIVEN EVERY 6 TO 8 HOURS POSTOPERATIVELY FOR 24 HOURS, OR UP TO 5 DAYS IN CERTAIN CASES.