Cymbalta^® (duloxetine hydrochloride) is a prescription medicine that is used to relieve symptoms of depression, neuropathic pain, and fibromyalgia, generalized anxiety disorder. It comes in capsule form and is usually taken once or twice a day. Some of the common side effects seen with this drug include drowsiness, nausea, and dizziness. Although Cymbalta is tolerated well by most people, it is not suitable for everyone. Before using Cymbalta, make sure to talk to your healthcare provider about any other health conditions you have, as well as any other medications you are taking.