Prozac (fluoxetine) can cause insomnia, drowsiness, and less sex drive in some people. Review a list of common Prozac side effects, plus ways to manage them. Fluoxetine (Prozac) is an SSRI used to treat depression, anxiety, OCD, and more by boosting serotonin in the brain. It’s most effective when combined with therapy and may cause side effects, so it should be taken under medical supervision. Common side effects of fluoxetine include loss of appetite, nausea, diarrhea, headache, trouble sleeping, dry mouth, and sexual dysfunction. In some patients, sexual dysfunction may persist even after the drug is discontinued, a condition known as post-SSRI sexual dysfunction. [11] Fluoxetine is used to treat depression, obsessive-compulsive disorder (bothersome thoughts that won't go away and the need to perform certain actions over and over), some eating disorders, and panic attacks (sudden, unexpected attacks of extreme fear and worry about these attacks). NHS information about the medicine fluoxetine, including what it's used for, who can take it, how to take it and side effects. Fluoxetine may cause some teenagers and young adults to be agitated, irritable, or display other abnormal behaviors. It may also cause some people to have suicidal thoughts and tendencies or to become more depressed. Fluoxetine works by blocking the reabsorption (reuptake) of serotonin in the brain, leaving more of it active between nerve cells. Serotonin is a neurotransmitter that helps regulate mood, emotions, and sleep. By increasing the availability of serotonin, fluoxetine can relieve symptoms of depression, anxiety, and OCD. Prozac is a selective serotonin reuptake inhibitor (SSRI) antidepressant. Fluoxetine affects certain chemical messengers (neurotransmitters) that communicate between brain cells and helps people with depression, panic, anxiety, or obsessive-compulsive symptoms. Find patient medical information for Fluoxetine (Prozac, Sarafem, others) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Defines the medication fluoxetine (Prozac, Sarafem, Prozac Weekly) a drug used in the treatment of depression, obsessive-compulsive disorders, panic attacks, and premenstrual dysphoric disorder. The article includes descriptions, uses, drug interactions, and side effects.