The highest dose of Lexapro generally given is 30 mg. They make 5 mg, 10 mg, and 20 mg pills. I currently take two 10 mg, and one 5 mg tablet before breakfast in the morning.However, because there is a chance for dizziness with Lexapro, some people take it at night before they go to bed. just now. Report Abuse. The highest dose of Lexapro generally given is 30 mg. They make 5 mg, 10 mg, and 20 mg pills. I currently take two 10 mg, and one 5 mg tablet before breakfast in the morning. However, because there is a chance for dizziness with Lexapro, some people take it at night before they go to bed.