A nurse is caring for a client with BPH who has been prescribed an alpha-blocker. The nurse should anticipate that this medication will primarily work by:

A. Relaxing the smooth muscles in the bladder neck is the action of alpha-blockers, not 5-alpha reductase inhibitors.

B. This is the correct answer. 5-alpha reductase inhibitors work by blocking the enzyme 5-alpha reductase, which converts testosterone into dihydrotestosterone (DHT). DHT is involved in the growth of the prostate gland, and reducing its levels can help shrink the prostate and improve urinary flow in BPH.

C. Inhibiting bacterial growth in the prostate gland is the action of antibiotics, not 5-alpha reductase inhibitors.

D. Contracting the prostate gland is not a desired effect in BPH management.

A. Overflow urinary incontinence is characterized by constant or frequent dribbling of urine due to the bladder's inability to empty fully. It is not specifically related to postvoid dribbling.

B. Stress urinary incontinence is the involuntary loss of urine during activities that increase intra-abdominal pressure, such as coughing, sneezing, or laughing. It is not directly related to postvoid dribbling.

C. This is the correct answer. Postvoid dribbling refers to the leakage of urine that occurs immediately after completing urination. It is often seen in clients with BPH due to the enlarged prostate obstructing the urethra, leading to incomplete bladder emptying and residual urine left in the urethra.

D. Urinary urgency is the sudden and strong desire to urinate and is not specifically related to postvoid dribbling.