The same time every day, in the morning or in the evening. Lexapro is an antidepressant in a group of drugs called selective serotonin reuptake inhibitor used to treat depression. This medicine include nausea, vomiting, diarrhea, upset stomach, loss of appetite, dizziness, drowsiness, trouble sleeping. Lexapro affects chemicals in the brain, Lexapro may cause relatively few and mild side effects, which generally tend to go away with continued treatment. Interesting that Lexapro was approved for adolescents given that Celexa wasn't approved for pediatric use. Lexapro anti depressant has helped millions and is continuing to help millions.