Bupropion Hydrochloride is primarily used as an antidepressant to treat major depressive disorder and seasonal affective disorder. It is also prescribed to aid in smoking cessation by reducing cravings and withdrawal symptoms. Unlike many other antidepressants, it works by inhibiting the reuptake of norepinephrine and dopamine, which helps improve mood and energy levels. Additionally, it is sometimes used off-label to manage symptoms of attention deficit hyperactivity disorder (ADHD) and bipolar depression. Its unique mechanism of action makes it a suitable option for patients who do not respond well to other antidepressants or who experience sexual side effects from other medications.