I was presribed Levaquin 750 mg after a severe reaction to a spider bite. The worst side effects I experienced were a lot of pain in both of my feet (making it difficult to walk) and a sickening taste in my mouth that I could NOT get rid of. I felt totally out of it when I was on this medication, like being in a fog or something. Not to mention that I was constantly thirsty and was sweating like crazy, even though I live in Colorado where there is virtually no humidity. About a week after I finished the medication, these side effects have finally pretty much disappeared. The doctor had samples of Levaquin that he gave me, which is probably one of the only reasons he chose this particular medication in the first place. Yuck--I will not take this medication again.