Fluoxetine hydrochloride is an antidepressant drug used medically in the treatment of depression, obsessive-compulsive disorder, bulimia nervosa, premenstrual dysphoric disorder and panic disorder. Fluoxetine is also used (off-label) to treat many other conditions, such as ADHD. Fluoxetine was derived from diphenhydramine, an antihistamine found to inhibit reuptake of the neurotransmitter serotonin.
Compared to other popular selective serotonin reuptake inhibitors (SSRIs), fluoxetine has a strong energizing effect. This makes fluoxetine highly effective in treatment of clinical depression cases where symptoms like depressed mood and lack of energy prevail. Although stimulating, it is also approved for a variety of anxiety disorders, including panic disorder and obsessive compulsive disorder.

Symbyax - Lilly - Official pharmaceutical website with resources for patients and health professionals.
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