I was on Lexapro for a couple of years and it quit working about 2 months ago. I was on 40mg, which is the highest dosage you can be on. I'm now taking 120mg of Cymbalta and seem to be doing better, for the most part. I'd call you doc and see what he/she has to say about the Lexapro and then go from there.
"God grant me the serenity to accept the things I can not change, the courage to change the things I can and the wisdom to know the difference."
DX: ankylosing spondylitis, periferal neuropathy, chronic migraines/headaches, depression/panic attacks, bi-polar, hypothyroidism, hypoglycemia, sleep apnea
RX: synthroid, estradiol, cymbalta, geodon, lamictal, inderal la, klonopin, seroquel, imiprimine, aspirin, relpax, phenergan, esgic plus
Surgeries: hysterectomy 1997, tonsillectomy 2001, deviated septum 2005, cataracts (both eyes) 2006