Cymbalta is a prescription medication primarily used to treat major depressive disorder and generalized anxiety disorder. It belongs to a class of drugs known as serotonin-norepinephrine reuptake inhibitors (SNRIs), which work by balancing chemicals in the brain that affect mood and emotions. In addition to depression and anxiety, Cymbalta is also prescribed for chronic pain conditions, such as fibromyalgia and diabetic neuropathy. Common side effects may include nausea, dry mouth, and fatigue. It is important for patients to discuss their medical history with a healthcare provider before starting this medication.