I have had to take Levaquin twice. Both times were for a post surgical infection. The Levaquin worked great on the infection, so I stuck with it even though it made me feel terrible. The side effects I had are: ringing in the ears (tinnitus), agitations/anxiety, dizziness, headache, inability to think straight, nausea, stuffed up nose. They were worse in the few hours after I took the Levaquin. I would take it at dinner, so I could sleep through most of the effects and not have to go to work feeling so bad. Fortunately, I did not suffer the insomnia some have had. After 5 days on it, I also got pain in my finger joints which took 2 weeks after stopping the Levaquin to go away. The pharmacist told me these are unfortunate side effects, but not dangerous enough ones to stop taking the drug. I really don't like this one at all, but I can say it does kill the infection.