A 52-year-old man with diabetes mellitus type 2 and hypertension presents with acute kidney injury (AKI) stage 2 following contrast-enhanced coronary angiography. Serum creatinine has risen from 1.2 mg/dL to 2.8 mg/dL within 48 hours. He is euvolemic on clinical examination. What is the drug of choice to prevent progression of contrast-induced nephropathy in this patient?