Benlasaxine is an antidepressant medication primarily used to treat major depressive disorder and anxiety disorders. It functions as a serotonin-norepinephrine reuptake inhibitor (SNRI), which means it increases the levels of serotonin and norepinephrine in the brain, helping to improve mood and alleviate anxiety. While it is effective for many patients, it may also have side effects, and its use should be monitored by a healthcare professional.