I would have to agree with the 3 week thing. I found that my panic got worse in the first couple weeks but once the Paxil kicked in after the 3 weeks I felt better. I only stayed on it for a few months because I didn't like the way it made me feel. I would urge you to try something else, ANYTHING else. It's addictive and chances are it won't help you all that much. My doctor gave me buspirone, it's not habit forming - ask your doctor about it, it might be a good alternative.
