I am so happy I found this site and read some of the entries. On Monday I had gone to the doctor because a sinus infection I had last week had come back. So he suggested something stronger this time, Avelox 400mg. The first night I took it I had the usual nausea and dizziness. But the 2nd night I took it I had on top of the nausea.... anxiety, couldn't focus, jittery, trouble falling asleep, slight tremors. I was freaked out because I never have this from any other antibiotic before. After I found this site, I called my doctor immediately and he switch me to the Z-pak, which I'm used to taking with little side effects. I still feel weird and can't wait until this drug is out of my system. I'm soo glad I stopped before my side effects got worse. What a horrible drug. It should be taken off the market! Yes i took away my infection fast but soooo not worth the horrible side effects!