Lexapro is taken orally, as often as indicated in the prescription of your doctor. Lexapro side effects are unlikely, but seek immediate medical attention if Lexapro side effects occur. Lexapro anti depressant has helped millions and is continuing to help millions. Lexapro affects chemicals 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 work by increasing the available supply of serotonin, Escitalopram improves symptoms of depression. Lexapro is used to treat depression and generalized anxiety disorder.