Duloxetine (brand name Cymbalta) is a medication that belongs to a class of drugs known as serotonin-norepinephrine reuptake inhibitors (SNRIs). It is prescribed frequently for depression and general anxiety disorder. It is also prescribed for conditions including diabetic nerve pain, fibromyalgia, and chronic musculoskeletal pain, such as back pain or chronic muscle pain. Here’s more on what you need to know about duloxetine, its primary uses, and what side effects to be aware of before taking the drug.