In the brain, is an important factor in the development and severity of depressive symptoms, such as sad mood, fatigue, lack of pleasure, etc. Escitalopram appears to relieve depression by increasing serotonin levels with minimal effect on many of the other chemicals in the brain that helps maintain mental balance. Lexapro is actually an updated version of an older anti-depressant called Celexa. If left untreated, can cause major problems in your life. Lexapro is used to treat depression. All is not perfect with Lexapro, consumers can feel pretty confident that their problems with anxiety will diminish and they can proceed with life as usual. Interesting that Lexapro was approved for adolescents given that Celexa wasn't approved for pediatric use. There have been some complaints about it, like its alleged contributions to weight gain and its high price.