I was prescribed Levaquin for a sinus infection. It has been pure heck to say the least! After a few hours of taking the first tablet (500 mg), I began to feel really crummy. By that, I mean, body aches, sleeplessness, stomachache, nausea, an overwhelming feeling of unwellness. By the second day, my fever broke, which was good. But, with each passing day, I began to feel worse and worse. It was as if the medication was building up in my system. By the fourth day, I could barely function! I was sicker and sicker with each passing day. The only time I felt even somewhat human again was the 23rd hour BEFORE it was time to take the next dose! Within an hour of taking the next dose, I was sick again. By the fifth day, I could no longer tolerate this medication. I felt as if it were the worst case of the flu I'd ever had. I felt so bad that I felt as if I were going to die. I can't explain it, but my husband had to make the call to the doctor's office because I barely had the strength to talk. I am convinced that had I stayed on this medication, it could have killed me! It has been 3 days since I stopped taking it and am still dealing with severe leg weakness. I may be calling the doctor again tomorrow. This medication is pure poison as far as I'm concerned! Very, very dangerous.