Fluoxetine hydrochloride is widely used in the treatment of major depressive disorder, helping to balance serotonin levels in the brain to improve mood and emotional stability. It is also prescribed for obsessive-compulsive disorder (OCD) to reduce unwanted thoughts and repetitive behaviors. Additionally, it is effective in managing panic disorder by decreasing the frequency and intensity of panic attacks. For individuals with bulimia nervosa, it aids in reducing binge-eating and purging cycles. It is sometimes used to treat premenstrual dysphoric disorder (PMDD), alleviating symptoms like irritability, mood swings, and bloating. Its application extends to certain cases of anxiety disorders, providing relief from excessive worry and tension.