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 does cause problems when you are operating a vehicle or driving heavy machinery. 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. Lexapro is actually an updated version of an older anti-depressant called Celexa.