Prozac (Fluoxetine) is a selective serotonin reuptake inhibitor (SSRI) used in the treatment of major depressive disorder, obsessive-compulsive disorder, bulimia nervosa, and panic disorder. It works by increasing serotonin levels in the brain, which helps improve mood, sleep, appetite, and energy levels. Prozac is a well-established medication with proven efficacy in managing various mood disorders.