A middle age male patient met with a road traffic accident & is brought to emergency in an unconscious state. CT abdomen reveals a splenic laceration, emergency splenectomy is done & patient is shifted to ICU. His BP remains low in post op period even after a bolus of normal saline. O/E- he is afebrile, has moon like face with central obesity & presence of violet striae over abdomen. Repeat CT scan of the chest, abdomen, and pelvis shows no hemorrhage. What is the next best step in management of this patient?