Lexapro: Lexapro is dosed as 10-20 mg. Daily, and can be lowered to 5mg. In kids or elderly. Few exceptions exist if it is determined by your doctor that response is only partial after sufficient time and no side effects, where higher dose is tried, usually up to 30mg.et help from a doctor now ›. Possibly: Lexapro affects serotonin, a neurotransmitter in the brain that modulates mood as well as anxiety. Lowering the dose of Lexapro could increase anxiety, especially if it was done too quickly.