I am currently on Lexapro and it's been about 8 1/2 weeks. I would say for me it really only started taking some sort of effect about 3-ish weeks ago. It definitely takes time and I believe it's still working up to it's full potential. You've just got to be patient and see how it works. It's done good things in helping me with anxiety, I do have spurts. Sometimes I'm great and then other days it may not be so good but this medication has helped me a lot. I was really struggling for quite a few weeks when first starting the medication, it got worse before it got better.