Duloxetine-d7 hydrochloride ((S)-Duloxetine-d7 hydrochloride) is the deuterium labeled Duloxetine hydrochloride. Duloxetine hydrochloride ((S)-Duloxetine hydrochloride) is a serotonin-norepinephrine reuptake inhibitor (SNRI) with a K i of 4.6 nM, used for treatment of major depressive disorder and generalized anxiety disorder (GAD).