What is the role of alpha-blockers in male incontinence related to bladder outlet obstruction?

• A. Alpha-blockers reduce outlet resistance by relaxing bladder neck/prostate smooth muscle, improving flow; may decrease retention-related leakage in obstructive cases.
• B. Alpha-blockers increase bladder neck tone to prevent leakage.
• C. They cure all forms of male incontinence.
• D. They are contraindicated in all male incontinence.

Answer: (A)

Alpha-blockers help in bladder outlet obstruction by blocking alpha-1 receptors in the smooth muscle of the bladder neck and prostatic urethra. This causes relaxation of that smooth muscle, lowers outlet resistance, and improves urine flow. By reducing obstruction, they can decrease post-void residual and the overflow leakage that often accompanies retention, making leakage less likely in obstructive cases. They are not a universal cure for all male incontinence, since many cases are due to urge incontinence or intrinsic sphincter deficiency and will not respond to this mechanism. They also do not increase bladder neck tone; in fact, they soften the outlet. Use is not absolute contraindication in all incontinence, but they should be used with caution in patients with low blood pressure or risk of orthostatic symptoms.