Interesting that the efficacy studies failed to show any superiority of 20 mg over 10 mg dosing. Because of reduced clearance capacity, anyone over 65 years of age should be restricted to no more than 10 mg/day. Phase 2 trials were conducted at 30 mg, but no efficacy trials were conducted using that dose.

http://www.rxlist.com/cgi/generic/lexapro_cp.htm#CP

Lar