Prozac^® is an antidepressant that is licensed for the treatment of depression, bulimia, panic disorder, and obsessive-compulsive disorder. The prescription medication, which is a type of selective serotonin reuptake inhibitor, comes in capsule or liquid form and is usually taken once or twice a day. Prozac may not be suitable for everyone, so let your healthcare provider know before starting the medicine if you are pregnant, have bipolar disorder, or have liver disease. Potential side effects of Prozac may include headache, drowsiness, and insomnia.