By altering the levels of a certain brain chemical, Lexapro^® (escitalopram oxalate) can be prescribed to treat conditions such as depression or generalized anxiety disorder. Typically, Lexapro is taken once a day and is available in the form of a tablet or liquid. Although most people tolerate Lexapro well, there are some potential side effects of the medication, such as nausea, insomnia, and headaches. If side effects become bothersome or the medication is not controlling your symptoms, there are alternatives to Lexapro.