Natalie said: "Lexapro is used to treat depression. Lexapro does cause problems when you are operating a vehicle or driving heavy machinery. Lexapro works by increasing the available supply of serotonin, Escitalopram improves symptoms of depression. The physician who elects to use Lexapro for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient. Lexapro affects chemicals in the brain that may become unbalanced and cause depression or anxiety."