A 78-year-old man with known benign prostatic hyperplasia (BPH) presents with increasing lower urinary tract symptoms (LUTS), including poor stream, hesitancy, and nocturia x4. His IPSS score is 18. Digital rectal examination reveals a moderately enlarged, smooth prostate. PSA is 2.5 ng/mL. Post-void residual volume is 80mL. What is the most appropriate initial pharmacological management?