A 62-year-old postmenopausal woman presents with a T-score of −2.8 on DEXA scan of the lumbar spine. She has no prior fragility fractures. Her serum calcium is 8.9 mg/dL (normal), phosphate 3.5 mg/dL (normal), and alkaline phosphatase 72 U/L (normal). Renal function and liver function are normal. She denies significant alcohol use and has adequate dietary calcium intake. What is the most appropriate next step in management?