Duloxetine increases pudendal nerve activity to aid closure. Which statement best describes its role?

• A. A diuretic effect
• B. Relaxation of the detrusor muscle
• C. Increase in pudendal nerve activity to aid closure
• D. Stimulation of bladder contractions

Answer: (C)

Duloxetine helps overflow continence by boosting the outlet’s grip on urine. It is a serotonin/norepinephrine reuptake inhibitor that increases levels of these transmitters in the spinal cord areas that control the external urethral sphincter (the pudendal nerve pathway). This enhances pudendal nerve–mediated activation of the external sphincter, strengthening its contraction when intra-abdominal pressure rises. The result is greater urethral closure pressure and less leakage during stress events.

This isn’t about making more urine (diuretic effect), nor about relaxing the detrusor muscle or stimulating bladder contractions. Those actions would either worsen incontinence or address a different problem; the therapeutic benefit here comes from improving outlet resistance through increased sphincter activity.