Lexapro^® (escitalopram oxalate) is a prescription drug that is licensed to treat a number of conditions within the brain. The medicine is commonly used for treating depression and generalized anxiety disorder. Lexapro works by helping to block the reuptake of a chemical in the brain called serotonin. Lexapro comes in a tablet form and as Lexapro Oral Solution. The tablet form of the drug is available in the following strengths: 5 mg, 10 mg, and 20 mg. You should seek medical attention immediately if you happen to overdose on Lexapro. Symptoms of a Lexapro overdose can include dizziness, drowsiness, a coma, and even loss of life. There is currently no generic Lexapro available for sale.