Do not take Escitalopram together with a monoamine oxidase inhibitor. Lexapro is actually an updated version of an older anti-depressant called Celexa. Lexapro affects chemicals in the brain that helps maintain mental balance. Lexapro tablets are film-coated, round tablets containing Escitalopram oxalate in strengths equivalent to 5 mg. This medicine include nausea, vomiting, diarrhea, upset stomach, loss of appetite, dizziness, drowsiness, trouble sleeping. Lexapro is an orally administered selective serotonin reuptake inhibitors. As indicated in the prescription of your doctor. Evidence suggests an imbalance of serotonin, a chemical messenger in the brain that helps maintain mental balance.