FOR GENERAL SURGICAL PROCEDURES IT IS GIVEN BY SUBCUTANEOUS INJECTION IN A DOSE OF 3200 UNITS 2 HOURS BEFORE THE PROCEDURE, FOLLOWED BY 3200 UNITS ONCE DAILY FOR 7 DAYS OR UNTIL THE PATIENT IS FULLY AMBULANT. FOR HIGHER RISK OR ORTHOPAEDIC PATIENTS A DOSE OF 4250 UNITS IS GIVEN 12 HOURS BEFORE THE PROCEDURE, FOLLOWED BY 4250 UNITS 12 HOURS POSTOPERATIVELY AND THEN ONCE DAILY FOR 10 DAYS.