6-Hydroxy Duloxetine-d3 is an isotope labelled analog of 6-Hydroxy Duloxetine. 5-Hydroxy Duloxetine is a metabolite of duloxetine (D721000). Duloxetine is an antidepressant. A dual serotonin and norepinephrine reuptake inhibitor (SNRI). Used in treatment of stress urinary incontinence.