Fluoxetine hydrochloride is widely used in the treatment of major depressive disorder, helping to alleviate symptoms such as persistent sadness, loss of interest, and fatigue. It is also effective in managing obsessive-compulsive disorder (OCD) by reducing intrusive thoughts and repetitive behaviors. Additionally, it is prescribed for bulimia nervosa to decrease binge-eating episodes and purging behaviors. The medication is utilized in treating panic disorder, helping to reduce the frequency and severity of panic attacks. It is also employed in the management of premenstrual dysphoric disorder (PMDD) to ease mood swings, irritability, and physical symptoms associated with the menstrual cycle. Its ability to balance serotonin levels in the brain makes it a versatile option for various mental health conditions.