Lexapro is a type of medication that can only be prescribed by doctors. Lexapro is used to treat a variety of disorders, including anxiety and depression. lexapro can remain present in the urine for about three to four days. It can be detected in the blood stream for about 24 to 48 hours after the last dosage was taken. After stopping the medication, effects may fade within one day. When stopping Lexapro, it is important to consult with a doctor, as some people will need to be weaned off of the drug slowly.