I also have been on Lexapro 9 years. I'm taking the 1.0 in four .50 doses because it's wearing off after 4-5 hours. Even this way I'm still having some breakthrough anxiety. This started a week ago after a bout with the flu. Before the flu I was anxiety free for 9 years. I'm just wondering if the breakthrough anxiety and medicines wearing off will get better? I'll have one good day, then a bad day. I've been on the new dosage three days now. Will it build up in my system so it won't wear off? Help!!! Please