Review Question - QID 108898

A 45-year-old male presents to the emergency room complaining of a four-day history of facial pain that is worsee just below the right eye. It is accompanied by a throbbing frontal headache, rhinorrhea, congestion, and a productive cough. His past medical history is notable for diabetes, obesity, and HIV with a CD4 count of 200 cells/mm^3 and viral load of 1,000 copies/ml. He takes HAART and metformin but admits to missing several doses. His most recent hemoglobin A1c was 11.1%. He has a 20 pack-year smoking history. His family history is notable for ovarian cancer in his mother and stroke in his father. A notable physical examination finding is shown in Figure A. He is exquisitely tender to palpation over the right maxillary sinus. A head CT and biopsy are pending. Administering which of the following is the most appropriate next best step in the management of this patient?