On lexapro the second time. worked great the first time but its been almost three weeks and i feel down. i started it for anxiety. is this normal?

Anxiety: I agree that after three weeks you should have a response. You should talk to your provider. A dose increase may help. The following article is good info: http://www.aafp.org/afp/2015/0501/p617.html Also, I find diet a big help. Check into glyconutrients, and I often find food allergy testing worh while www.thedocstu.com

Yes: Your body can build up a tolerance to the medication if you've had previous trials on it. Give it some time. If you had good response to it in the past, you're likely to have good response moving forward. If you're not doing counseling as well, I would suggest it. Sometimes our circumstances have changed significantly and may need some new approaches too.