Derved forstærkes urinrørets lukning under opbevaring af urinen.
How duloxetine works in SUI is not clear but it is thought that, by increasing the levels of 5-hydroxytryptamine and noradrenaline at the level of the nerves that control the muscle of the urethra (the tube that leads from the bladder to outside), duloxetine causes a stronger closure of the urethra during urine storage.