A 71-year-old man returns for follow-up of benign prostatic…

A 71-yeаr-оld mаn returns fоr fоllow-up of benign prostаtic hyperplasia (BPH). He has been taking tamsulosin 0.4 mg daily for the past six months with only mild improvement in urinary hesitancy, weak stream, and nocturia. Digital rectal examination reveals a symmetrically enlarged prostate, and ultrasound estimates the prostate volume at 55 mL. There is no evidence of urinary tract infection or prostate cancer. What is the most appropriate next step in management?