Q. A 32-year-old female presents to the emergency department with a 3-day history of high fever up to 102°F, accompanied by chills and episodes of nausea and vomiting. She reports a sharp pain on her right flank that increases in intensity upon palpation. Over the last 24 hours, she also began experiencing burning sensations during urination, increased urgency, and frequency. On examination, her blood pressure is 100/60 mm Hg, pulse rate is 98 bpm, and she is febrile with a temperature of 102.2°F. Right costovertebral angle tenderness is noted on palpation. A urine dipstick reveals nitrites, leukocyte esterase, and small blood. A urine culture and sensitivity test are ordered. Blood tests show a white blood cell (WBC) count of 18,000/uL with a left shift indicating a predominance of neutrophils. A renal ultrasound is performed to rule out abscesses or obstructions and reveals no anomalies. What is the most appropriate treatment for this patient?