Q. A 45-year-old man with a history of hypertension controlled with lisinopril comes to the medical outpatient department complaining of frothy urine and swelling around his eyes and ankles for the past two weeks. On physical examination, his blood pressure is 150/95 mm Hg, and the doctor notes periorbital and pedal edema. Lab tests reveal serum creatinine of 1.4 mg/dL, urinary protein of 3.5 g/24hr, and a cholesterol level of 280 mg/dL. What is the most appropriate next step in the management of this patient?