Please consult your physician before taking any medication. Prozac (fluoxetine) is used to treat major depressive disorder, bulimia, obsessive-compulsive disorder and panic disorder. Includes Prozac side effects, interactions and .. Fluoxetine is an antidepressant in a group of drugs called selective serotonin reuptake inhibitors (SSRIs). Fluoxetine affects chemicals in the brain that may become unbalanced and cause depression, panic, anxiety, or obsessive-compulsive symptoms. Fluoxetine is used to treat major depressive disorder.