I think all that sort of medicine quits working at a certain point. I took Lexapro for anxiety for several years and it changed my life, then after about a couple of years I started getting anxiety symptoms back and then one night I had a horrible attack and my life is still not under control yet. I am taking prystique, abilify and xanax now. My doctor says after a while one of the medicines does not help with all the symtptoms anymore so she added abilify so we will see if that will work.