i am a 52 year old male with many med. problems. I have taken Tequin twice, with no problems. I am now on Levaquin, 750 mg.X 10 days for an absessed tooth. I have taken 3. I won't take any more. I have had the following side effects: Lightheaded, Shakey, sweating,stomach cramps, dizzy, sore throat, fever, and depression/anxiety. I believe I have become "sensitized" to this family of drugs. Be aware, and tell your Doctor.