Duloxetine is an antidepressant drug belonging to the class of serotonin norepinephrine reuptake inhibitors (SNRIs). It is an analogue of fluoxetine (a selective serotonin reuptake inhibitor or SSRI) synthesized by the pharmaceutical company Eli Lilly.
Duloxetine - Chemical Structure
Most likely, duloxetine is better known under the trade names Cymbalta® and Xeristar®.