“…However, anti coagulant drugs are not free from complications and are not con venient to the patient, relatives or medical staff. Their mode of action is not yet fully understood (Shaw, 1962). The usual scheme is to give intramuscular Heparin, 10,000 units intramuscularly six hourly, together with an initial dose of an antiprothrombin drugdicoumarol, coumarin, Tromexan, Dindevan or Warfarin -accord ing to personal preference and experience.…”