Interesting that Lexapro was approved for adolescents given that Celexa wasn't approved for pediatric use. There is a serious question about the safety and efficacy of initiating treatment with Lexapro to begin with. Depression is a serious condition that, if left untreated, can cause major problems in your life. Lexapro works by increasing the available supply of serotonin. Lexapro tablets are film-coated, round tablets containing Escitalopram oxalate in strengths equivalent to 5 mg. Lexapro is used to treat depression. To go away with continued treatment.