Medscape - Depression, obsessive-compulsive disorder, premenstrual dysphoric disorder-specific dosing for Prozac (fluoxetine), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation schedules, and cost information. Prozac (fluoxetine) is a selective serotonin reuptake inhibitor (SSRI) used to treat several mental health conditions. The usual starting Prozac dosage in adults and children is 10 mg to 20 mg once daily in the morning. Your healthcare provider may raise your dose after a few weeks based on your response. You may need a different Prozac dosage based on your age, weight, or the health condition. Detailed Fluoxetine dosage information for adults and children. Includes dosages for Depression, Panic Disorder, Obsessive Compulsive Disorder and more; plus renal, liver and dialysis adjustments. Key Takeaways Prozac, known generically as fluoxetine, belongs to a group of antidepressants called selective serotonin reuptake inhibitors (SSRIs). It balances serotonin levels, improving mood. Prozac is a prescription drug used to treat depression and other mental health conditions. Learn about the drug’s dosages, form, strengths, and more. Learn the typical dosages of fluoxetine (Prozac) for depression, OCD, and panic disorder. Find details on available strengths (10mg, 20mg, 40mg), daily timing, and what to do if you miss a dose. Fluoxetine is an antidepressant and belongs to a group of medicines known as selective serotonin reuptake inhibitors (SSRIs). This medicine works by increasing the activity of a chemical called serotonin in the brain. This medicine is available only with your doctor's prescription. Find patient medical information for Fluoxetine (Prozac, Sarafem, others) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings PROZAC and Olanzapine in Combination — The starting dose of oral olanzapine 2.5 to 5 mg with fluoxetine 20 mg should be used for patients with a predisposition to hypotensive reactions, patients with hepatic impairment, or patients who exhibit a combination of factors that may slow the metabolism of olanzapine or fluoxetine in combination. Fluoxetine dosages depend on the conditions being treated and the age of the patient. Doctors may start with low dosages of fluoxetine and gradually increase the dose. Those using the drug must be patient, as it may take 4 to 5 weeks before they see benefits. Increasing the fluoxetine dosage too much or too quickly could potentially be harmful.