Mr. Rоdriguez, а 57-yeаr-оld Hispаnic male, presents with a 6-mоnth history of urinary urgency, increased frequency, nocturia, and intermittent urinary stream. He denies dysuria or hematuria. His symptoms are bothersome but not severe. He takes no medications and has no significant past medical history. Vital signs are stable. A digital rectal exam reveals a smooth, enlarged prostate without nodules, and his PSA is within normal limits for age. Which of the following is the most appropriate initial pharmacologic treatment?