David Drummond, a 66 year male is recovering from bowel surgery in hospital. On day three he develops tenderness, pain a

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David Drummond, a 66 year male is recovering from bowel surgery
in hospital. On day three he develops tenderness, pain and warmth
in his right calf.
Mr Drummond is started on the following medication schedule:
Given your knowledge of these drugs and their use in
anticoagulant management, why is Mr Drummond receiving both a
subcutaneous and an oral anticoagulant for several
days?
(Note: Your answer should take into consider David's medical
history and all medication received. Remember to incorporate latest
evidence based practice in your answer)